Effect Of Seed Treatment Research Articles

Seed Treatment Effects on Maize Seedlings Coinfected with Fusarium spp. and Pratylenchus penetrans.

Seedling diseases of maize are caused by a complex of organisms, including fungi in the genus Fusarium. Root-lesion nematodes (Pratylenchus spp.) are common in fields where maize is grown, and they are known to interact with Fusarium spp. in several crops. The objectives of this study were to assess the impacts of seed treatment combinations on maize seedlings coinfected with Pratylenchus penetrans and two Fusarium spp. that cause seedling disease symptoms (Fusarium graminearum and F. verticillioides) and to determine whether there were interactions between P. penetrans and the Fusarium spp. Growth-chamber experiments were conducted with fungicide- or nematicide-treated or untreated maize seed planted in a sand-soil mixture infested with inoculum of either F. graminearum or F. verticillioides. A suspension of 4,000 P. penetrans (mixed stages) was added to the pots at the time of planting. After 30 days, shoot length and fresh and dry shoot and root weights were determined. Total root length and fine root length, root volume, numbers of root tips and forks, and root surface area were measured through analysis of digital images of the root systems. After 42 days, P. penetrans nematodes were extracted and quantified from roots and soil. There were significant effects of the treatments on root health with interactions between Fusarium spp. and P. penetrans. F. graminearum caused the greatest reductions in root and shoot growth, and interactions with P. penetrans were more evident for F. verticillioides than for F. graminearum. Image analysis of root system architecture showed that seed treatment significantly improved root system characteristics. Seed treatments containing the nematicide abamectin in combination with fungicides reduced root infection by P. penetrans and provided the healthiest root system when under attack by the Fusarium-Pratylenchus complex.

Conservation tillage and thiamethoxam seed treatments as tools to reduce thrips densities and disease in cotton and peanut

Damage to seedling cotton as a result of feeding by adult and immature thrips can result in stunted growth and reduced plant stand. Transmission of Tomato spotted wilt virus by thrips in peanut can result in reduced yield and plant stand. The objectives of this research were to examine the effects of planting cotton and peanut into conventionally (no soil residue) tilled plots or planting into reduced tillage plots including rolled rye and standing rye (cotton only) tillage in conjunction with thiamethoxam seed treatments on seedling thrips counts, thrips associated injury in cotton, Tomato spotted wilt virus incidence in peanut, and yield for both crops. Conservation tillage practices consistently reduced adult and immature thrips populations in cotton. Standing rye residues suppressed thrips similarly to rolled rye, but yielded less lint in one of the two years. Thiamethoxam seed treatment effects were inconsistent, although general numerical trends suggest that this practice can suppress immature thrips for up to three weeks in cotton. Thiamethoxam seed treatment either had no effect or significantly improved cotton lint yield depending on year. Conservation tillage was also effective at reducing immature thrips in peanut. Incidence of Tomato spotted wilt virus in peanut was decreased in conservation tilled plots in 2013, but was slightly greater in 2014. Similarly, effects of tillage on peanut yield were significant but inconsistent between years. Thiamethoxam seed treatments did not consistently reduce thrips in peanut nor did it improve yield in either year. These data demonstrate conservation tillage and thiamethoxam seed treatments are generally effective practices for reducing thrips densities; however, effects on yield and disease transmission were inconsistent.

Effect of Seed Treatment with Biological Control Agent against Bipolaris Leaf Blight of Wheat

Effect of Seed Treatment with Biological Control Agent against Bipolaris Leaf Blight of Wheat

Effect of Host Plant Resistance and Seed Treatments on Soybean Aphids (Hemiptera: Aphididae) and Their Natural Enemies

Abstract The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is a serious pest of soybean in the North Central region of the United States. Management tools include resistant varieties and insecticidal seed treatments, used alone or in combination, which may have variable effects on different pest or natural enemy species. In this 1-yr field study we examined the response of soybean aphids and natural enemy abundance to aphid-resistant Rag1 soybeans, with and without thiamethoxam seed treatment. Rag1 resistance, thiamethoxam seed treatment, and both together, significantly reduced cumulative aphid days and increased yield compared to the untreated susceptible control, though there was no interaction of these factors. Peak aphid density in the control was 799.4 ± 174.8 aphids/plant. In Rag1 resistant soybeans, peak aphid density (312.2 ± 121.3 aphids/plant) was above the economic threshold but below the economic injury level, whereas in susceptible soybeans with seed treatment, the peak ap...

Effect of Seed Treatment on Seedling Health of Chili

Effect of seed treatment on seedling health of chili (BARI Morich 1) was studied at Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh. BAU Bio-fungicide (3% of seed weight), chitosan (1% solution), thiovit (0.3% of seed weight), compressed moist heat (54ºC for 15 minutes), neem leaf extract (1:1 w/v), garlic clove extract (1:3 w/v), ginger extract (1:2 w/v) and allamonda leaf extract (1:1 w/v) were employed as seed treating agents. The treated seeds were placed on moistened blotter paper. Data were recorded on percent germination, production of percent healthy seedling and seedling vigour of chili. The results of seed health testing showed that, five different seed borne fungi viz. Colletotrichum capsici, Curvularia lunata, Rhizopus stolonifer, Aspergillus flavus and Fusarium moniliforme were found to be associated with the tested chili seed samples. Among these fungi, Curvularia lunata was the most prevalent one which was followed by Rhizopus stolonifer, Colletotrichum capsici, Fusarium moniliforme and Aspergillus flavus. All the seed treating agents were found to be effective compared to control in controlling seed borne fungi for the blotter method. The highest percentage of germination (93.33%) was recorded when the seeds of BARI Morich 1 were treated with BAU Bio-fungicide, whereas the lowest percentage of germination (61.33%) was recorded in case of untreated seeds. The highest percentage of healthy seedling (95.33%) was recorded when the seeds were treated with BAU Bio-fungicide and allamonda leaf extracts, whereas the lowest percentage of healthy seedling (59.00%) was recorded in case of untreated seeds. The highest vigour index (681.59) was recorded when the seeds were treated with neem leaf extracts, whereas the lowest vigour index (214.66) was recorded in case of untreated seeds.DOI: http://dx.doi.org/10.3329/jesnr.v7i1.22167 J. Environ. Sci. & Natural Resources, 7(1): 177-181 2014

Effect of Seed Treatment on Seed Germination and Seedling Growth Attributes of Yeheb (Cordeauxia edulis) with In-Vitro Conditions

Yeheb (Cordeauxia edulis) is an evergreen shrub in the bean family that produces seeds in semi-arid bush land on sandy soils of Somalia and Ethiopia. It is drought hardy and one of the major sources of food for both animals and humans. It also used as medicine and source of natural dyes for coloring of food and textiles and to build house as it is termite resistance. Even though it is a multipurpose plant and being encouraged by most people, it becomes endangered due to low seed viability and over exploitation. Those problems have to overcome by micro propagation and regeneration process. The pre-condition of those attempts are having adequate seed treatment and germination. Thus, the objective of this study is to know the effect of seed treatment on seed germination and seedling growth Attributes of C. edulis in In-Vitro conditions. Both coated and de-coated seeds were sterilized using different concentrations of 3%, 5%, 10% and 15% and 2-3 drops of Tween-20 for 5 min and cultured on growth regulators-free solid MS medium. Results in this study revealed that sterilization of de-coated seeds of C. edulis with 5% Clorox for 5 min was found to be valuable for both seed germination and seedling growth. As conclusion, it is important for In Vitro germinated seedlings which are essential for further experimental process of micro propagation and regeneration. Besides, it is used to as effort for further research activities by reducing time and cost.

Effect of Seed Treatment on Incidence and Severity of Garlic White Rot (Sclerotium cepivorum Berk) in the Highland Area of South Tigray, North Ethiopia

A participatory evaluation of integrated white rot management was conducted for two years during the 2013 and 2014 main cropping seasons (Julys-October) in Emba-Alaje and Enda-Mokoni Woredas of South Tigray. The sites selected for the trial were potential for garlic production and many farmers used this crop as main source of income. However, the productivity of the crop is declining from time to time due to white rot infestation. Hence, this study was conducted to evaluate hot water treatment and chemical application on controlling white rot infestation. During the first year, three treatments were used for the experiment: chemical treatment (Apron star 42 WS), hot water treatment at 46°C and farmers practice (control). During the second demonstration year additional treatment hot treatment plus chemical treatment included. The first year results indicated that lowest white rot incidence (25%) and number of cloves per hectare (2670) infected by white rot was recorded from hot water treated plots followed by chemical treatment (29% incidence) and (4240 infected cloves) per hectare. White rot incidence and number of plants per hectare infected by white rot was very high in the control plots as exhibited by 45% and 7910 plants, respectively. Significantly higher marketable yield (126.09 qt/ha) was obtained from hot water treated plots, while the lowest marketable yield (96.576 qt/ha) was obtained from the control or farmers practice plots. About 30.5% yield advantage was obtained from hot water treated plots compared to the control plot. The same result was also recorded during the second year demonstration. In Ayba and Atsela Kebeles the highest marketable yield and low white rot incidence and severity were recorded from hot water treated plots. Hot water treatment has also received higher acceptances and was ranked first by the farmer’s participated in the research for its low cost and higher response Unlike the two Kebeles, incidence of white rot in Simret Kebele was 100% in all treatments, however hot water treatment preferred by participant farmers by its accessibility. Therefore, from the result we can conclude that based on the accessibility, environmental benefits and farmer’s preferences hot water treatment is promising practice for white rot treatment in the intervention Kebeles.

Effects of Seed Treatment on Sudden Death Syndrome Symptoms and Soybean Yield

Sudden death syndrome (SDS) is a soybean disease that perennially limits yields in the Kansas River Valley. The presence of soybean cyst nematode (SCN) and saturated soils have been implicated in contributing to the severity of the disease. Selecting varieties with some degree of tolerance to SDS is the only cultural practice that can potentially reduce the severity of SDS and improve yields. Variety selection alone, however, cannot improve the production of soybeans to make them profitable. The challenge of trying to manage irrigation scheduling to avoid saturated soils further complicates efforts to increase productivity with irrigation while still avoiding SDS. A study with seed treatments applied to soybean was conducted at the Kansas River Valley Experiment Field in 2014, with treatments applied to a soybean variety with a high level of tolerance to SDS. The study was irrigated earlier and more often than normal to promote the disease. The most severely infested plots had more than 50% of the leaf area expressing symptoms of SDS by the R6 growth stage. Treatments with ILeVO from Bayer CropScience (Research Triangle Park, NC) reduced foliar symptoms and increased yields up to 12 bu/a, or more than 25%. These results are similar to those in a 2013 study of varieties with SDS tolerance ranging from very susceptible to more tolerant; the yield increase was up to 16 bu/a, or 40% with the ILeVO seed treatment.

Improved wheat performance with seed treatments under dry sowing on permanent raised beds

Two strategies for seeding irrigation are used for irrigated wheat. Wet sowing utilizes pre-sowing irrigation to germinate weed seeds and thus control weeds, followed by sowing. Dry sowing plants into dry soil that is irrigated soon afterward, resulting in higher soil moisture during germination and emergence than wet sowing. Field observations have indicated reduced emergence, plant stands and yield in dry compared to wet sowing on a Vertisol in northwestern Mexico. This disadvantage is more acute when dry sowing is conducted in permanent beds with residue retention (conservation agriculture) compared to the conventional system involving tillage with residue incorporation. To identify the causes of reduced plant stand and yield and examine control options, chemical seed treatment effects on durum wheat (Triticum durum Desf.) and bread wheat (Triticum aestivum L.) performance under wet and dry sowing were investigated over three seasons in a permanent bed system. Four seed treatments were applied: Control (no seed treatment); Carboxin+thiram+chlorothalonil (Vit-Dac; fungicides); Difenoconazole+mefenoxam (Dif-Mef; fungicides); and Thiamethoxam+difenoconazole+mefenoxam (TMX-Dif-Mef; insecticide and fungicides). Plant stands, root rot scores, normalized difference vegetative index (NDVI), and grain yield were determined. Under dry sowing, Dif-Mef and TMX-Dif-Mef increased plant stands by 87% and 104%, respectively, compared to Vit-Dac, and by 152% and 172%, respectively, compared to the control. Under dry sowing, TMX-Dif-Mef increased yield by 9.76% and 17.7% compared to Vit-Dac and the control, respectively. Bread and durum wheat were significantly different for both emergence and yield every growing season. Seed treatments effects were not significant under wet sowing. Treatment differences were not linked with root rot incidence later in the season. Several mechanistic hypotheses to explain the results were explored. TMX has been reported to alter genetic expression to enhance response to early season abiotic stresses, but this has not been reported for Dif-Mef. The different physical conditions during stand establishment, i.e. increased moisture and reduced temperature, under dry sowing compared to wet sowing, could have affected microbial populations which induced biological suppression of germination and/or emergence. Although more research is required to explain the underlying mechanism, wheat producers transitioning to a dry sowing system under conservation agriculture with permanent raised beds may avoid yield loss by utilization of a Dif-Mef or TMX-Dif-Mef seed treatment.

Effect of seed treatment by cold plasma on the resistance of tomato to Ralstonia solanacearum (Bacterial Wilt).

This study investigated the effect of cold plasma seed treatment on tomato bacterial wilt, caused by Ralstonia solanacearum (R. solanacearum), and the regulation of resistance mechanisms. The effect of cold plasma of 80W on seed germination, plant growth, nutrient uptake, disease severity, hydrogen peroxide (H2O2) concentration and activities of peroxidase (POD; EC 1.11.1.7), polyphenol oxidase (PPO; EC 1.10.3.2) and phenylalanine ammonia lyase (PAL; EC 4.3.1.5) were examined in tomato plants. Plasma treatment increased tomato resistance to R. solanacearum with an efficacy of 25.0%. Plasma treatment significantly increased both germination and plant growth in comparison with the control treatment, and plasma-treated plants absorbed more calcium and boron than the controls. In addition, H2O2 levels in treated plants rose faster and reached a higher peak, at 2.579 µM gFW−1, 140% greater than that of the control. Activities of POD (421.3 U gFW−1), PPO (508.8 U gFW−1) and PAL (707.3 U gFW−1) were also greater in the treated plants than in the controls (103.0 U gFW−1, 166.0 U gFW−1 and 309.4 U gFW−1, respectively). These results suggest that plasma treatment affects the regulation of plant growth, H2O2 concentration, and POD, PPO and PAL activity in tomato, resulting in an improved resistance to R. solanacearum. Consequently, cold plasma seed treatment has the potential to control tomato bacterial wilt caused by R. solanacearum.

Clinical observation of 125I seed treatment of recurrence of glioma and the environmental radiation

Objective To observe 125I seed treatment effect and environmental radiation in the treatment of recurrent glioma.Methods 64 patients with recurrent glioma patients,according to the wishes of patients and their families were divided into observation group of 30 cases and a control group of 34 patients.Clinical outcomes and follow-up of 125I seeds around radiation were compared between the two groups.Results The treatment efficiency of observation group and control group was 60.0％ (18/30),and 35.3％ (12/34),respectively,which was statistically significant(x2 =8.39,P ＜0.05).Follow-up from 0 to 6 months,the ambient radiation rapidly decreased as the distance increaseing with the implantation point,radiation dose in a distance of 40cm has been close to the natural basis of radiation dose;125I seeds measured radiation dose continued to decay with increasing time after implantation.Four months later,it was close to the natural basis of radiation dose.Conclusion Conclusion 125I radioactive particles in the treatment of recurrent glioma have good curative effect.The effects of radiation on the surrounding environment crowd are easily protected. Key words: Iodine radioisotopes; Glioma

Effect of Fungicide Seed Treatments, Cultivars, and Soils on Soybean Stand Establishment.

Seedling diseases are one of the major production problems for soybean. The primary control of soybean seedling diseases is by fungicide seed treatments but comparisons of seed treatments are difficult because stand responses are often erratic in the field. The objective of this study was to determine the efficacy of soybean fungicide seed treatments in naturally infested soils under controlled environments at three temperatures. Seed of three soybean cultivars were treated with six fungicide treatments or not treated and planted in two soil types collected from two fields in April, May, and June 2008 and 2009. Tests were conducted in growth chambers at 21°C (April planting), 25°C (May planting), or 28°C (June planting). Stands were determined when at least 25% of the seedlings reached the V4 growth stage. Seed treatments improved stands at all three temperatures, in both soils, and in both years. In general, the broad-spectrum fungicides trifloxystrobin + metalaxyl and mefenoxam + fludioxonil + azoxystrobin resulted in the highest stands. The selective fungicide treatments metalaxyl and pentachloronitrobenzene + carboxin were effective at all three temperatures, implying that Pythium spp. and Rhizoctonia solani, respectively, were involved in seedling disease and active over a range of temperatures. The efficacy of fungicides was not consistently associated with the cultivars used in this study.

Effects of Aldicarb and Neonicotinoid Seed Treatments on Twospotted Spider Mite on Cotton

Twelve field experiments and one laboratory experiment were conducted to determine the effects of furrow applied aldicarb and seed treatments of thiamethoxam, imidacloprid, Avicta (thiamethoxam + abamectin), Aeris (imidacloprid + thiodicarb), and acephate on twospotted spider mite, Tetranychus urticae Koch, on cotton, Cossypium hirsutum L. For the field experiments, data were pooled across all experiments for analysis. Aeris, thiamethoxam, and imidacloprid treatments resulted in twospotted spider mite densities greater than those in the untreated check, aldicarb, and acephate treatments. However, cotton treated with Avicta (thiamethoxam + abamectin) had 34% fewer mites than other neonicotinoid seed treatments when infestations occurred near cotyledon stage. Untreated check and aldicarb treatments had the lowest mite densities. Only aldicarb reduced mite densities below that in the untreated check. In a laboratory trial, the fecundity of twospotted spider mite was measured. While neonicotinoid seed treatments increased mite densities in the field, they did not increase fecundity in the laboratory experiment. Foliar applied thiamethoxam slightly elevated average fecundity in the laboratory experiment. Increased use of neonicotinoid seed treatments instead of furrow applied aldicarb is likely at least partly responsible for recent increased twospotted spider mite infestations in seedling cotton across the mid-south.

Effect of Seed Treatment and Soaking Duration on Germination of <i>Eryngium foetidum</i> L. Seeds

Seed viability and germination of Eryngium foetidum using soaking duration and chemicals treatments was studied at the field laboratory of Bangabandhu Sheikh Mujibur Rahman Agricultural University during July 2010 to June 2011. Seed treatment with growth regulator (GA 3 500 ppm + Kinetin 50 ppm) and soaking of seeds enhanced seed germination in the laboratory. Chemical treatment (copper oxi-chloride 0.2% + tetracycline 1000 ppm) had no significant increase of seed germination over control. Untreated or pesticide treated seeds exhibited lower germination than growth regulator treatment. Increase of soaking duration enhances and increased seed germination up to 96 hours. Consecutive 96 hours soaking and drying (8 hours soaking and 4 hours drying) of Eryngium seeds treated with GA 3 500 ppm and Kinetin 50 ppm gave the maximum germination percentage 74.7% in laboratory and enhanced germination by 2 ~ 3 days over control.

Comparative Effects of Organic and Inorganic Seed Treatments on the Viability and Vigour of Sesame Seeds in Storage

This study was undertaken to determine the storability of pre-treated sesame seeds and to compare the effects of inorganic and organic seed treatments on the viability and vigour of sesame seeds during storage. Two hundred grammes of sesame seeds were treated separately with recommended dosages of Neem leaf powder (NLP), Dress force powder (DFP), Dry pepper powder (DPP) and untreated seeds being the control; each treatment placed in air-tight container and stored in a wooden cabinet at average ambient conditions of 26.5°C and 80% RH for a period of 18 weeks. Completely randomized design was used for the experiment, with storage time and seed treatment as factors. Samples were drawn from storage at interval of two weeks and tested for seed viability and seedling vigour. Seed germination, seedling vigour index, speed of germination and rate of germination were evaluated. Analysis of variance (ANOVA) was carried out on the data collected, and treatment means were separated using Duncan’s Multiple Range Tests (DMRT). Correlation analysis was also carried out to ascertain the kinds of relationships that exist among the variables evaluated. Observations showed that NLP and DPP treatments had better mean seed germination of 89.53% and 82.35% respectively compared to DFP (46.47%) and control (80.76). NLP also enhanced better seedling vigour index (339.24) throughout the strorage time compared to DFP (99.74). It is therefore recommended that natural botanicals like NLP could be adopted for short and medium term storage of sesame seeds; as it maintaned seed viability and seedling vigour optimally among other treatments.

Efeito do tratamento de semente com fungicidas associado à pulverização foliar no controle da ferrugem asiática da soja

O presente trabalho teve como objetivo avaliar o efeito do tratamento de sementes associado à pulverização foliar no controle da ferrugem asiática da soja. O experimento foi conduzido na estação experimental da Emater-GO, no município de Senador Canedo, GO. O delineamento experimental foi o de blocos ao acaso no esquema fatorial 3x2x2 com 4 repetições. Dois fungicidas triazóis foram testados no tratamento de sementes: fluquinconazol e flutriafol, em duas cultivares de soja, BRS Valiosa RR e Emgopa 315 RR, e pulverização foliar com fungicida azoxistrobina associado com ciproconazol e nimbus. Para todas as variáveis analisadas, realizou-se análise de variância em esquema fatorial e as médias foram comparadas pelo teste Tukey a 5 % de probabilidade. O tratamento de sementes com fluquinconazol e flutriafol não afetou a emergência em nenhuma das cultivares analisadas. Aos 65 dias após a semeadura, observou-se que a cultivar Emgopa 315 RR obteve menor incidência da ferrugem. Os fungicidas fluquinconazol e flutriafol promoveram também uma menor incidência e menor severidade da doença. Para a variável desfolha, foi observado que a Emgopa 315 RR obteve menor desfolha do que a BRS Valiosa RR na data avaliada. Dentro da cultivar BRS Valiosa RR os tratamentos com fungicidas para tratamento de sementes promoveram menor desfolha do que sem tratamento de sementes. Já na Emgopa 315 RR esse fato não foi detectado. O tratamento de sementes com fungicidas pode ser uma ferramenta útil para o manejo da ferrugem asiática da soja, apesar desta técnica de aplicação de fungicidas não ter influenciado na produtividade das cultivares de soja transgênicas.

Genetic and Seed Treatment Effects in Organic Peanut

ABSTRACT Stand establishment has been a challenge for organic peanut production in the Southeastern United States. Field experiments were conducted in 2007 and 2009 in research plots certified for organic production to evaluate the potential of genotype selection, shelling procedure, and seed treatment with Bacillus subtilis to improve stand establishment and seedling emergence rates, reduce incidence of Aspergillus crown rot, and increase seedling biomass. Seed of 15 peanut genotypes were mechanically shelled or hand-shelled, and treated with B. subtilis or untreated prior to planting in early June. Percent stand was estimated for each plot 17–21 days after planting (DAP), and percent seedlings affected by Aspergillus crown rot and plant biomass were estimated 21–24 DAP. Seed treatment significantly affected stand establishment for three genotypes each year, Georgia-01R both years, C-99R and Tifguard in 2007, and C34-24-69 and C724-19-25 in 2009. In all of these cases, the hand-shelled plots had significantly greater stands than the mechanically shelled plots for untreated and/or B. subtilis treated seed. B. subtilis treatment improved stands for two of the mechanically shelled treatments that significantly responded to hand shelling. Despite low incidence, there was a significant reduction of crown rot in the hand-shelled plots compared to the mechanically shelled plots across years and genotypes. The cultivar Georganic, which has been planted to organic peanut systems in Georgia in recent years, was among the genotypes with the lowest seedling establishment rates and biomass. Based on these results, it is recommended that sorting thresholds for damaged seed be higher for seed destined for organic production, and that breeding efforts that include assessments of factors involved in seedling establishment and growth be prioritized.

Wpływ zaprawy fungicydowej na produktywność i zdrowotność ziarna owsa oplewionego

Wpływ zaprawy fungicydowej na produktywność i zdrowotność ziarna owsa oplewionego

Effect of Insecticide Seed Treatments on Sugarbeet Storability

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Effect of Seed Treatment, In-furrow, and Foliar Application of Insecticides on the Carrot Weevil in Processing Carrot

Field studies were conducted in 2004 and 2005 to determine the effectiveness of a seed treatment, an in-furrow treatment, and foliar applications of insecticides for control of the carrot weevil [Listronotus oregonensis (Coleoptera: Curculionidae)] in processing carrot (Daucus carota). Carrot seed treated with fipronil resulted in significantly less root damage at harvest then did the in-furrow application of thiamethoxam or multiple foliar applications of diazinon or spinosad in both years, and resulted in significantly higher yields compared with all other treatments in 2004. Seed treatments with fipronil should be considered for future registration on carrot. Such registration would allow early to midseason protection of carrot from weevil damage and compliment the current management program of foliar sprays to control adult weevils.