Mississippi Delta Research Articles

Evolution of overall survival (OS) after curative-intent lung cancer surgery in a population-based Mississippi Delta cohort.

278 Background: Surgical resection is the most important curative modality for patients with lung cancer, with long-term OS influenced by both surgical quality and cancer biology. We compared surgical care and outcomes over 4 eras in the population-based Mid-South Quality of Surgical Resection (MS-QSR) cohort, an ongoing regional surgical and pathologic quality improvement (QI) dissemination and implementation project. Methods: We implemented a surgical lymph node collection kit and a novel pathology gross dissection method across 12 hospitals encompassing >95% of lung cancer resections in 5 contiguous Dartmouth Hospital Referral Regions. We analyzed the MS-QSR cohort at 5-year intervals characterized by stepped-wedge implementation of specific QI interventions: Era 1 (2004-2008; baseline, no QI), Era 2 (2009-2013; quality feedback, surgical QI pilot), Era 3 (2014-2018; surgical QI implementation), and Era 4 (2019-2023; combined surgical QI and pathology QI implementation). We used standard statistical methods to compare surgical quality; Kaplan-Meier plot, log-rank test, and Cox proportional hazards model with Era 1 as reference to compare OS across eras. Results: Of 7240 resections, 14%, 31%, 29%, and 26% were performed in Eras 1-4, respectively (Table). Attainment of the stringent International Association for the Study of Lung Cancer (IASLC) definition of complete resection increased from 0% in Era 1 to 32% in Era 4; attainment of the American College of Surgeons Operative Standard 5.8 (ACS_OS 5.8), the current US definition of surgical quality, improved from 4% in Era 1 to 67% in Era 4; 120-day mortality rate decreased from 10% to 4% (p<0.0001 for all comparisons). With median follow-up of 4.7, 5.5, 5.6, and 2 years for Eras 1-4, 3-year OS rates were 60%, 64%, 70%, and 79%; 5-year OS rates were 48%, 52%, 58%, and 70%, respectively (p<0.0001). The Hazard Ratio (HR) for mortality decreased from 0.91 (95% CI: 0.8-0.99) in Era 2 to 0.49 (95% CI: 0.43-0.56) in Era 4. Conclusions: Surgical quality and OS sequentially improved in this diverse, high-risk population-based Mississippi Delta surgical resection cohort. We are evaluating the full range of factors associated with this striking OS improvement. Ongoing work is exploring biologic correlates to this improvement. Variable Era 1 N= 988 Era 2 N=2235 Era 3 N=2107 Era 4 N=1910 Median age (Q1, Q3) 68 (62, 74) 68 (62, 74) 68 (61, 74) 68 (61, 74) Male sex (%) 514 (52%) 1234 (55%) 1082 (51%) 977 (51%) Black race 221 (22%) 416 (19%) 450 (21%) 451 (24%) Attained ACS_OS 5.8 40 (4%) 533 (24%) 1050 (50%) 1272 (67%) IASLC complete resectionUncertain completeness 0 (0%)930 (94%) 194 (9%)1932 (86%) 435 (21%)1594 (76%) 606 (32%)1227 (64%) 120-day mortality 100 (10%) 197 (9%) 139 (7%) 72 (4%) 5-year OS 48 (45-51) 52 (50-55) 58 (56-60) 70 (66-74) HR (95% CI) Reference 0.91 (0.83-0.99) 0.75 (0.69-0.83) 0.49 (0.43-0.56)

Structured multidisciplinary decision making and survival in the prospective observational Detecting Early Lung Cancer (DELUGE) in the Mississippi Delta cohort.

35 Background: Lung cancer screening (LCS) and incidental lung nodule programs (LNP) are associated with improved lung cancer survival (OS); multidisciplinary care (MDC) enhances guideline concordance. We evaluated the outcomes of patients with LCS- or LNP-detected lung cancer who received care with, versus without, structured program-based multidisciplinary decision-making within a large, tri-state regional community healthcare system. Methods: Prospective observational study of patients enrolled into LCS and LNP in the DELUGE cohort. Data on patients diagnosed with lung cancer was linked to a prospective institutional MDC database to classify care delivery as MDC or non-MDC. We compared patient demographic and clinical characteristics, including stage distribution with chi-square tests, OS with the log-rank test, and used proportional hazards models for death with hazard ratios adjusted for age, sex, race, smoking history, insurance status and histologic type. Results: From 2015 to 2023, 504 patients were diagnosed through LCS, 195 (39%) had MDC; 1714 through LNP, 712 (42%) had MDC; 2,218 in total through both early detection programs, 907 (41%) had MDC (Table). 89% of MDC recipients resided in metropolitan areas, compared to 60% of non-MDC patients (p<0.0001). There was a median of 1 (Interquartile range: 1-2) comorbidity across all subsets. Adenocarcinoma was more common among the MDC subsets: 46% v 35% LCS, 56% v 43% LNP; small cell lung cancer was more common among the non-MDC subsets: 11% v 18% LCS, 9% v 14% LNP (p=0.0005). Clinical Stage I was more frequent among MDC v non-MDC subsets for LCS, LNP, and both (all p<0.001, Table). OS was significantly higher in MDC v non-MDC (p<0.0001), aggregate 3-year OS was 75% v 55% (LCS), 60% v 42% (LNP), 63% v 45% (both); and 5-year OS was 65% v 51% (LCS), 49% v 34% (LNP), 52% v 37% (both), respectively. Sensitivity analysis restricting the cohorts to metropolitan patients only or to patients who received care within the institutions where the MDC was active yielded similar results. Conclusions: Structured multidisciplinary decision-making was strongly associated with significant stage re-distribution and better OS among patients diagnosed with lung cancer through screening or lung nodule programs. The MDC structure needs to be embedded within early lung cancer detection programs for optimal results. Variable LCS: MDC? LNP: MDC? Both Programs: MDC? Yes; n=195 No; n=309 Yes; n=712 No; n=1002 Yes; n=907 No; n=1311 Median age, years 68 68 69 71 69 70 Female, % 49 48 51 50 50 49 Black race, % 13 20 30 22 26 22 Medicaid/uninsured, % 2 5 7 7 6 7 Actively smoking, % 70 74 46 52 51 57 Stage I v IV, % 66 v 11 47 v 21 52 v 19 33 v 34 55 v 17 36 v 31 Surgical resection, % 52 32 45 20 46 23 Adjusted HR for death Ref 1.9 (1.3, 2.7) Ref 1.6 (1.4, 1.9) Ref 1.7 (1.4, 1.9)

Drinking Water Quality in Delta and Non-Delta Counties along the Mississippi River

The Mississippi Delta region has worse population health outcomes, including higher overall cardiovascular and infant mortality rates. Water quality has yet to be considered as a factor in these health disparities. The objective of this paper is to determine overall differences in basic water quality indicators, electrolytes of cardiovascular importance, trace elements, heavy metals, and radioactive ions of groundwater in delta and non-delta counties in states along the Mississippi River. Data were sourced from the major-ions dataset of the U.S. Geological Survey. We used the Wilcoxon rank sum test to determine the difference in water quality parameters. Overall, delta counties had lower total dissolved solids (TDS) (47 and 384 mg/L, p-value < 0.001), calcium (7 and 58 mg/L; p-value < 0.001), magnesium (2 and 22 mg/L; p-value < 0.001), and potassium (1.57 and 1.80 mg/L; p-value < 0.001) and higher sodium (38 mg/L and 22 mg/L; p-value < 0.001) compared to non-delta counties. Overall, there were no statistical differences in trace elements, heavy metals, and radioactive ions across delta versus non-delta counties. These results underscore the need for further epidemiological studies to understand if worse health outcomes in delta counties could be partially explained by these parameters.

Neighborly Surveillance: The Mississippi State Sovereignty Commission and the Development of a Post-Jim Crow Ideological Apparatus

The relations of production in Deep South regions like the Mississippi Delta require a high degree of control over race and class configurations. While the overt, de jure White supremacy that marked the post-Reconstruction era allowed for effective repression of dissent, the promise of federal intervention and grassroots organizing during the years of the civil rights movement required White elites to recalibrate methods of control. By integrating theories of racialization of space, internal colonialism, and Althusser’s (2006) notion of the ideological state apparatus, I suggest that this transition from overt to implicit control was accomplished by creating a culture of neighborly surveillance in which everyday Whites were deputized to surveil and report on civil rights organizing at the grassroots level. By neighborly surveillance, I refer to surveillance between and amongst private citizens enacted outside the purview of the formal state but in the interest of the powerful elite who control the state. I document this process through analysis of the archives of the Mississippi State Sovereignty Commission, an official state agency tasked with spying on and counteracting civil rights activity. These records demonstrate the extent to which non-state actors assumed the roles originally exercised by the de jure Jim Crow regime. Beyond augmenting understandings of the civil rights movement-era US South, this article contributes analytical insights to social and ideological transitions in other post-colonial, post-authoritarian spatial contexts.

From Benevolence

Abstract: The two-act drama explores the transformation in the Mississippi Delta in the wake of the death of Emmett Louis Till, the Chicago teenager who was murdered in the summer of 1955. Benevolence explains the toll of the legacy of enslavement on individuals and families. It tells the story of two women, the men in their lives, and their experiences during this time.

Enhanced mud retention as an autogenic mechanism for sustained delta growth: Insight from records of the Lafourche subdelta of the Mississippi River

ABSTRACTMud deposition is acknowledged as a significant contributor to delta architecture, yet its role is often oversimplified as a constant parameter in models of delta formation. A better understanding of mud retention on deltas would resolve remaining questions regarding delta growth. This study explores how spatiotemporally varied mud retention facilitates sustained delta growth in defiance of the concept of autoretreat, that is, the idea that shoreline progradation rates decline as a delta grows due to the expansion of subaqueous and subaerial delta surfaces. This research is inspired by prior field observations of the river‐dominated Mississippi Delta, USA, where the shoreline of a ca 6000 to 8000 km2 subdelta prograded at a constant rate for roughly a millennium, despite its expanding delta surface, compaction and sea‐level rise. For this, a laterally averaged one‐dimensional numerical model is leveraged to test hypotheses that enhanced mud retention with time in: (i) the delta bottomset; and (ii) the delta plain (floodplain) supports a constant rate of shoreline progradation in a maturing delta. Results demonstrate that enhanced mud retention in both the bottomset and delta plain facilitates sustained delta growth. Neither component by itself can replicate the case study. Yet, with these two integrated components, the model reproduces the cross‐section and linearly prograding pattern observed in the Mississippi Delta. The findings provide an autogenic mechanism for sustained delta growth and support the importance of mud as a fundamental building block of deltas that should be incorporated in delta‐growth models of engineered river diversions.

Furrow irrigation spacing effects on corn production in vertisols of the Mississippi Delta

Furrow irrigation spacing effects on corn production in vertisols of the Mississippi Delta

An algae-based polymer material as a pesticide adjuvant for mitigating off-target drift

Off-target pesticide drift from cropland is a major source of pesticide exposure to pollinating insects inhabiting crop and wildlands in the lower Mississippi Delta (LMD) in the USA. This study is aimed to develop a drift-reducing pesticide adjuvant that is less/nontoxic to honeybees. Ongoing toxicology experiments with two widely-used insecticides and sodium alginate (SA) pointed out reductions in honeybee mortality compared to an industry standard reference polyacrylamide (PAM). When used as an adjuvant to spray the same insecticides described above, SA did not interfere in killing the target pests. Therefore, SA has been tested as a drift-reducing pesticide adjuvant to protect honeybees. Spray experiments in the lab were carried out in four sets: (i) water only, (ii) water and adjuvant, (iii) water and pesticide, and (iv) water, pesticide and adjuvant. Each set contained 18 treatment combinations to cover the ranges in spray pressure (three), adjuvant dose (three), and spray nozzles (two). The droplet spectrum was analyzed using a P15 image analyzer. Diameters of 10 %, 50 % and 90 % volumes (DV10, DV50, and DV90), droplet velocity, standard deviation and relative span were measured. The drift reduction potential (DRP) of SA was analyzed by (i) dose, (ii) spray pressure, and (iii) nozzle type. The DRP of SA is compared to that of PAM. Additionally, three field experiments were carried out to analyze the efficiency of SA in reducing pesticide drift. The results from our experiments collectively indicate that SA has significant potential in mitigating drift as well as minimizing pesticide toxicity to honeybees.

Removal of microplastics from agricultural runoff using biochar: a column feasibility study

Plastics are extensively used in agriculture, but their weathering and degradation generates microplastics (MPs) that can be carried by runoff into water bodies where they can accumulate and impact wildlife. Due to its physicochemical properties, biochar has shown promise in mitigating contaminants in agricultural runoff. However, few studies have examined its effectiveness at removing MPs. In this study, we assessed MP pollution (>30 μm) in runoff from a farm in the Mississippi Delta and examined the effectiveness of biochar (pinewood and sugarcane) to remove MPs from aqueous solutions. Using micro-Fourier Transform Infrared spectroscopy (µ-FTIR), we observed an average of 237 MPs/L (range 27–609) in the runoff, with most particles identified as polyethylene, polyamide, polyvinyl chloride, polyurethane, acrylonitrile butadiene styrene, and polyarylamide. Biochar columns effectively removed MPs from runoff samples with reductions ranging from 86.6% to 92.6%. MPs of different sizes, shapes, and types were stained with Nile red dye (to facilitate observation by fluorescence) and quantified their downward progress with multiple column volumes of water and wet/dry cycles. Smaller MPs penetrated the columns further, but ≥90% of MPs were retained in the ∼20 cm columns regardless of their shape, size, and type. We attribute these results to physical entrapment, hydrophobic behaviors, and electrostatic interactions. Overall, this proof-of-concept work suggests biochar may serve as a cost-effective approach to remove MPs from runoff, and that subsequent field studies are warranted.

Effectiveness and residual activity of four common insecticides used in the Mississippi Delta to control tarnished plant bugs in cotton.

The tarnished plant bug, (TPB) Lygus lineolaris Palisot de Beauvois (Hemiptera: Miridae) is a key pest of cotton in the midsouth region and some areas of the eastern United States. Its control methods have been solely based on chemical insecticides which has contributed to insecticidal resistance and shortened residual periods for control of this insect pest. This study was conducted over a two-year period and examined the efficacy and residual effect of four commercial insecticides including lambda-cyhalothrin (pyrethroid), acephate (organophosphate), imidacloprid (neonicotinoid), and sulfoxaflor (sulfoxamine). The effectiveness and residual effects of these insecticides were determined by application on cotton field plots on four different dates during each season using three different concentrations (high: highest labeled commercial dose (CD), medium: 1/10 of the CD, low: 1/100 of the CD) on field cotton plots. Four groups of cotton leaves were randomly pulled from each treated plot and control 0-, 2-, 4-, 7-, and 9-days post treatment (DPT) and exposed to a lab colony of TPB adults. One extra leaf sample/ plot/ spray /DPT interval (0-2-4-7-9-11) during 2016 was randomly collected from the high concentration plots and sent to Mississippi State Chemical Laboratory for residual analysis. Mortality of TPB adults was greatest for those placed on leaves sprayed with the organophosphate insecticide with mortalities (%) of 81.7±23.4 and 63.3±28.8 (SE) 1-day after exposure (DAE) on leaves 0-DPT with the high concentration for 2016 and 2017, respectively, reaching 94.5±9.5 and 95.4±7.6 6-DAE each year. Mortality to all insecticides continued until 9 and 4-DPT for high and medium concentrations, respectively. However, organophosphate (39.4±28.6) and pyrethroid (24.4±9.9) exhibited higher mortality than sulfoxamine (10.6±6.6) and the neonicotinoid (4.0±1.5) 7-DAE on 9-DPT leaves with the high concentration. Based on our results using the current assay procedure, TPB adults were significantly more susceptible to contact than systemic insecticides and due to its residual effect, organophosphate could kill over 80% of the TPB population 7-DPT.

Influence of Lygus-Traited Cotton Technology on Performance of Commonly Used Inecticides for Tarnished Plant Bug Management Prior to Bloom

The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is the most economically damaging insect pest of cotton, Gossypium hirsutum L., production in the Mid-South region of the U.S. In Mississippi alone, tarnished plant bug caused approximately $270 in losses per hectare and accounted for nearly 70,000 lost bales per annum during 2021 and 2022. Insecticide use is the foundation of integrated pest management strategies for control of tarnished plant bug in the Mid-South. Prior to bloom, acephate, imidacloprid, and sulfoxaflor are commonly used insecticides for tarnished plant bug management. Research was conducted in the Mississippi Delta region with commonly used insecticides prior to bloom to evaluate their performance in non-ThryvOnTM and ThryvOn cotton varieties. Research suggests that imidacloprid has a limited fit in non-ThryvOn cotton production. However, these data indicate that the additional mode of action provided by ThryvOn cotton could extend the longevity of imidacloprid, along with other commonly used insecticides in Mid-South cotton production.

Outcomes of Resected Lung Cancer Diagnosed Through Screening and Incidental Pulmonary Nodule Programs in a Mississippi Delta Cohort

IntroductionEarly lung cancer detection programs improve surgical resection rates and survival but may skew toward more indolent cancers. MethodsHypothesizing that differences in stage-stratified survival indicate differences in biological aggressiveness and possible length-time and overdiagnosis bias, we assessed a cohort who had curative-intent resection, categorized by diagnostic pathways: screening, incidental pulmonary nodule program, and non–program based. Survival was analyzed using Kaplan-Meier plots, log-rank tests, and Cox regression, comparing aggregate and stage-stratified survival across cohorts with Tukey’s method for multiple testing. ResultsOf 1588 patients, 111 patients (7%), 357 patients (22.5%), and 1120 patients (70.5%) were diagnosed through screening, pulmonary nodule, and non–program-based pathways; 0% versus 9% versus 6% were older than 80 years (p = 0.0048); 17%, 23%, and 24% had a Charlson Comorbidity score greater than or equal to 2 (p = 0.0143); 7%, 6%, and 9% had lepidic adenocarcinoma; 26%, 31%, and 34% had poorly or undifferentiated tumors (p = 0.1544); and 93%, 87%, and 77% had clinical stage I (p < 0.0001).Aggregate 5-year survival was 87%, 72%, and 65% (p = 0.0009), including 95%, 74%, and 74% for pathologic stage I. Adjusted pairwise comparisons showed similar survival in screening and nodule program cohorts (p = 0.9905). Nevertheless, differences were significant between screening and non–program-based cohorts (p = 0.0007, adjusted hazard ratio 0.33 [95% confidence interval: 0.18–0.6]) and between nodule and nonprogram cohorts (adjusted hazard ratio 0.77 [95% confidence interval: 0.61–0.99]). Stage I comparisons yielded p = 0.2256, 0.1131, and 0.911. In respective pathways, 0%, 2%, and 2% of patients with stage I disease who were older than 80 years had a Charlson score greater than or equal to 2 (p = 0.3849). ConclusionsNeither length-time nor overdiagnosis bias was evident in NSCLC diagnosed through screening or incidental pulmonary nodule programs.

No‐Till Improves Soil Water Storage in Mississippi Delta

No‐Till Improves Soil Water Storage in Mississippi Delta

Investigating Dirofilaria immitis isolates infecting domestic canines and their susceptibility/resistance patterns to macrocyclic lactones in the northern region of the Mississippi Delta area (southeast Missouri)

Previous reports of macrocyclic lactone (ML) resistance in Dirofilaria immitis, the parasitic nematode which causes heartworm disease, have mainly been from the southern Mississippi Delta region. Southeast Missouri (SEMO), forming the northern boundary of this region, has not previously been well studied. The area is an ideal propagation region for heartworm infection and possibly for the spread of ML resistance. To assess whether D. immitis isolates infecting domestic canines in SEMO exhibit evidence of resistance to MLs, domestic canines, presented to veterinary facilities testing positive for heartworms through antigen and microfilariae (MF) examination, were utilized in the study. Using a descriptive epidemiological cross-sectional study, from March 2021 through February 2022, blood sample collection from 96 canines living in SEMO testing positive for heartworms were analyzed. MiSeq technology was utilized to sequence specific genetic markers associated with susceptibility/resistance for MLs in D. immitis isolates. Genomic data revealed most D. immitis isolates had genotypic profiles consistent with resistance to MLs. Of the 96 samples tested, 91 (94.8%) had a resistant genotype, 4 (4.2%) had a mixed genotype, and 1 sample (1%) genotyped as susceptible. While detailed and reliable medical histories were not available for most canines, detailed medical history from 2 canines indicated evidence of phenotypic resistance that was consistent with their genotypes. However, in vivo preventive tests are needed to confirm a high frequency of phenotypic ML resistance in D. immitis from this region. Increasing resistance patterns to MLs indicate the approach to heartworm prevention/treatment protocol should be reconsidered. New measures may be required to stop heartworm disease.

Evaluation of single and mixed cover crops species in a sandy loam soil under corn production

AbstractInformed selection of cover crop species is critical for optimizing their benefits by considering the costs of adoption and potential initial negative impact on yields against the proven benefits for sustainable production. The Lower Mississippi Delta region is lagging in cover crop adoption, partly due to a paucity of this information from the area, despite being one of the major row crop‐producing regions in the United States. Common cover crop species in the region, cereal rye (CR) (Secale cereale), hairy vetch (HV) (Vicia villosa), and crimson clover (CC) (Trifolium incarnatum), and their possible two‐ and three‐combination mixes were evaluated for their impact on biomass production, enzyme activities, nutrient cycling, and corn (Zea mays) yields. HV + CC + CR and HV + CR produced the highest biomass and lowest yields compared to all treatments. HV and CC produced the least biomass but comparable yields to no cover crop. HV + CC + CR, HV + CR, CR, CC, and HV treatments had comparable total nitrogen, phosphorus, and soil organic carbon levels in the surface 0‐ to 5‐cm depth. Generally, CC alone and the HV + CR mix consistently displayed significantly higher phosphatase, N‐acetylglucosaminidase, β‐glucosidase, and cellobiohydrolase activities compared to all other treatments, while CR had the lowest. The single species of CC or HV may be the best option in the short term for initial cover crop implementation, rotating with CR a few years down the line for optimum long‐term benefits under corn production in this region.

We Are Castaways: Archipelagic Imagination in Our Trembling Échos-monde

This article, here translated from the author's original lecture in Portuguese, distills his experiences of fieldwork in Latin America and reading of Caribbean authors who took his “imagination to the creole seas,” from which emerged eventually a “vision of archipelago” as a space-time splintering conducted from underwater, anti-continental perspectives. Bringing the challenge of archipelagicity to the reconfiguring of time as well as space, the lecture traces his journey from creole toward archipelago. Traversing the Mississippi delta, island clusters, and coral atolls in the Atlantic, Pacific, and Indian Ocean worlds, gathering up the poetics of dialects, pidgins, creoles, and other errant tongues, it is an “unpacific” voyage that dredges up the author's East Asian, Pacific Rim identity as a divining rod for sensing archipelagic connections between differently creolized subjectivities. This meaningful web, generated through a shared awareness of not history but its lack, constitutes a new home: “a dwelling called archipelago.”

Developing a Maternal Health Worker Training Program in Rural Mississippi [ID 2683576

INTRODUCTION: Mississippi faces the highest infant mortality rate and maternal mortality rate in the United States, with rates for Black women four times higher than for White women. Using community maternal health workers (MHWs) to support patients during pregnancy and postpartum has proven beneficial in other locations and could be transformative in rural Mississippi. We aimed to identify key patient needs to create a MHW training program in the rural Mississippi Delta, as a component of a broader maternal health quality improvement project. METHODS: We conducted quality improvement interviews with 18 obstetric patients (10 prenatal, 8 postpartum) at Delta Health Center, a federally qualified health center in Mound Bayou, Mississippi. We queried patients about strengths and gaps in their prenatal care and their opinions on MHWs. We also queried the obstetrics and gynecology and pediatrics teams at Delta Health Center to identify key pregnancy, postpartum, and infant care and development topics needed for MHW training. RESULTS: 17/18 (94%) of the patients interviewed were in support of the MHW program. The following themes emerged in patient interviews: desire for psychologic support, connection to community resources, and help managing high-risk pregnancy conditions. We designed a 2-week training for MHWs that covers: MHW Responsibilities, Pregnancy Care, Childbirth, Postpartum Care, and Newborn Care and Infant Development. Based on patient feedback, the training prioritizes content related to psychological support and high-risk pregnancy care. CONCLUSION: Patients expect MHWs to be valuable assets for their care. Maternal health workers have the potential to support pregnant women in rural health care settings, ultimately enhancing maternal–fetal health outcomes.

Integration of Sentinel-1A Radar and SMAP Radiometer for Soil Moisture Retrieval over Vegetated Areas.

NASA's Soil Moisture Active Passive (SMAP) was originally designed to combine high-resolution active (radar) and coarse-resolution but highly sensitive passive (radiometer) L-band observations to achieve unprecedented spatial resolution and accuracy for soil moisture retrievals. However, shortly after SMAP was put into orbit, the radar component failed, and the high-resolution capability was lost. In this paper, the integration of an alternative radar sensor with the SMAP radiometer is proposed to enhance soil moisture retrieval capabilities over vegetated areas in the absence of the original high-resolution radar in the SMAP mission. ESA's Sentinel-1A C-band radar was used in this study to enhance the spatial resolution of the SMAP L-band radiometer and to improve soil moisture retrieval accuracy. To achieve this purpose, we downscaled the 9 km radiometer data of the SMAP to 1 km utilizing the Smoothing Filter-based Intensity Modulation (SFIM) method. An Artificial Neural Network (ANN) was then trained to exploit the synergy between the Sentinel-1A radar, SMAP radiometer, and the in situ-measured soil moisture. An analysis of the data obtained for a plant growing season over the Mississippi Delta showed that the VH-polarized Sentinel-1A radar data can yield a coefficient of correlation of 0.81 and serve as a complimentary source to the SMAP radiometer for more accurate and enhanced soil moisture prediction over agricultural fields.

Abstract P302: The Mississippi Rural Community Listening Project

Background: The Appalachia and Mississippi Delta regions have the lowest life expectancy in the United States. In response, Alabama, Mississippi, Kentucky, and Louisiana were selected for The Risks Underlying Rural Areas Longitudinal (RURAL) Study. The RURAL study is an observational population-based study focused on these at-risk communities in the rural south. During the planning phase, investigators identified the need to incorporate insights from the community in the proposal. Therefore, they initiated the “Rural Community Listening Project” in the four states to seek community members’ points of view on outreach research in their communities. The objectives of this research were to hear from members of the communities their concerns and ideas about health research, approaches that would promote their willingness to participate, and their willingness to have blood drawn and x-rays taken as a part of the research process. Method: Mississippi investigators conducted four focus group interviews with 10-12 participants in each focus group. They interviewed a total of 45 men and women between the ages of 35 to 65 in county-specific focus groups. The groups represented four rural Mississippi Counties: LeFlore, Oktibbeha, Panola, and Tishomingo. The investigators digitally recorded the interviews and had them transcribed, then analyzed the transcripts using thematic analysis. Results: Two themes arose: (1) Encouragement to Participate and (2) Barriers to Participation. Encouragement to Participate included (1) having trusted community stakeholders involved, (2) helping the community, (3) promoting one’s health, and (4) receiving feedback on one’s health. Barriers included lack of trust, time, location, and transportation. Overall, the focus group interviewees had not participated in health research but would be willing to do so. Participants had little to no experience in doing health surveys or tracking their health information using mobile or electronic devices but did not raise objections to doing so. Word-of-mouth, social media, newspaper, telephone, cell phone, and mail were recommended as modes of communicating with their communities. “Relevance to the individual” arose as a more prominent encourager than monetary incentives. Focus group interviewees reported trusting doctors, nurses, and health care providers in their respective communities to collect health information. Conclusion: The in-common barriers to participation in research were time, transportation, and location. Across all focus groups, trust emerged as a requisite for research participation. The model of listening to the community’s experiences, concerns, and recommendations can potentially inform future research practices in rural communities and changes to related state and/or local policies.

Field Evaluation of Biological and Conventional Insecticides for Managing Multiple Insect Pests in Cotton

Abstract Cotton, Gossypium hirsutum (L.), is an economically important crop in the United States that is plagued by a complex of insect pests. Two key pests of cotton in the midsouthern United States are the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois) (Hemiptera: Miridae), and bollworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae). A suite of highly effective synthetic insecticides is typically used for control of these pests. However, it is unclear how the combined management of these two insect pests with biological insecticides impacts the economics of cotton production. To address this shortcoming, we conducted a field experiment in the Mississippi Delta over 2 yr to study the effects of synthetic and biological insecticides for control of the tarnished plant bug and bollworm on cotton yield. The results indicated the control of tarnished plant bug with synthetic insecticides had the most significant impact on cotton yield and net returns. The conventional tarnished plant bug treatment also significantly increased bollworm density and damage, but these increases did not significantly alter yield or net return in non–Bacillus thuringiensis (Bt) or Bt cottons. The economic benefit of a conventional approach to tarnished plant bug control with synthetic insecticides was US$438.07/ha in non-Bt and $700.88/ha in Bt cotton relative to those treated with a biological insecticide. The biological insecticides used for this study were ineffective at significantly altering yield or net return. However, for insect management in cotton to be sustainable, alternatives must be found to complement conventional synthetic insecticides.