Field Evaluation Research Articles

Field evaluation of a commercial light trap for sand fly (Diptera: Psychodidae: Phlebotominae) surveillance in the Peruvian Amazon and new species records for Cusco Department

Field evaluation of a commercial light trap for sand fly (Diptera: Psychodidae: Phlebotominae) surveillance in the Peruvian Amazon and new species records for Cusco Department

Benchmarking Low-Cost Particulate Matter Sensors: Evaluating Performance Under Controlled Environmental Conditions Using Low-Cost Experimental Setups

Particulate matter (PM) is widely recognized as a major air pollutant with significant impacts on human health, highlighting the need for accurate monitoring. In developing countries, low-cost sensors are crucial for accessible PM monitoring, but their accuracy and reliability must first be assessed. This study benchmarked the Alphasense OPC-N3 and Next PM sensors through laboratory and field evaluations. Laboratory tests were performed in controlled conditions with HEPA-filtered air at low humidity and varying concentrations of water droplets from nebulized deionized water. A 27-day field study in Cienfuegos, Cuba, provided additional insights into real-world performance. The OPC-N3 showed susceptibility to perturbations and was more affected by outliers (especially PM10), relative humidity, and interference from aqueous aerosols. In contrast, the Next PM sensor demonstrated superior stability, lower noise levels, and consistent performance across different environmental conditions. Despite a substantial price difference, both sensors provided valid measurements. Additionally, both sensors produced lognormal PM concentration distributions during field campaigns. This feature could aid in addressing the calibration stability challenges commonly associated with low-cost sensors through in situ calibration methods. While the PM measurements by affordable sensors are not perfect, they are sufficiently reliable for supporting air quality assessments in resource-limited settings.

A mono-phasic protocol for micropropagation of potato cv. CoochBehar local, its acclimatization, on-field evaluation, and fidelity analysis.

A protocol for micropropagation of potato (Solanum tuberosum L.) cv. CoochBehar local retaining the fidelity of the in vitro regenerants was established for the first time. Initially, tuber sprouts were inoculated in Murashige and Skoog (MS) basal medium supplemented with 0.5-1.5mg/l 6-benzyladenine (BA), kinetin (Kin), meta-Topolin (mT), and zeatin (Zea). A maximum number of shoots was induced in 0.5mg/l Zea followed by 0.5mg/l mT. For subsequent rooting, the shoots were inoculated in MS medium supplemented with 1.0-3.0mg/l indole-3-acetic acid and indole-3-butyric acid (IBA), wherein 1.0mg/l IBA-fortified medium recorded the maximum number of roots. The mono-phasic micropropagation, i.e., simultaneous multiple shoots and roots formation was achieved in MS medium with combinations of Zea (0.25-1.0mg/l) with 1.0mg/l IBA, wherein 0.5mg/l Zea + 1.0mg/l IBA exhibited the best results. The micropropagated plantlets were then acclimatized in cocopeat with 100% survival before field evaluation. To ensure the true-to-type nature of the micropropagated plants, the cytology, flow cytometry, intersimple sequence repeats (ISSR), and start codontargeted (SCoT) polymorphism primers based fidelity analyses were carried out. Cytology and flow cytometry confirmed that the micropropagated plants had the same ploidy levels. Likewise, the molecular marker-based genetic fidelity study via ISSR and SCoT primersshowed monomorphic banding patterns. The present protocol has the potential for large-scale propagation, conservation, and commercialization of indigenous potatoes and can also be used to study the response of other potato cultivars to in vitro regeneration.

On the accuracy of data assimilation algorithms for dense flow field reconstructions

Within the framework of the European Union Horizon 2020 project HOMER (Holistic Optical Metrology for Aero-Elastic Research), data assimilation (DA) algorithms for dense flow field reconstructions developed by different research teams, hereafter referred to as the participants, were comparatively assessed. The assessment is performed using a synthetic database that reproduces the turbulent flow in the wake of a cylinder in ground effect, placed at the distance of one diameter from a lower wall. Downstream of the cylinder, this wall continues either in the form of a flat steady wall, or of a flexible panel undergoing periodic oscillations; these two situations correspond to two different test cases, the latter being introduced to extend the evaluation to fluid–structure interaction problems. The input data for the data assimilation algorithms were datasets containing the particle locations and their trajectories identification numbers, at increasing tracer concentrations from 0.04 to 1.4 particles/mm3 (equivalent image density values between 0.005 and 0.16 particles per pixel, ppp). The outputs of the DA algorithms considered for the assessment were the three components of the velocity, the nine components of the velocity gradient tensor and the static pressure, defined in the flow field on a Cartesian grid, as well as the static pressure on the wall surface, and its position in the deformable wall case. The results were analysed in terms of errors of the output quantities with respect to the ground-truth values and their distributions. Additionally, the performances of the different DA algorithms were compared with that of a standard linear interpolation approach. The velocity errors were found in the range between 3 and 11% of the bulk velocity; furthermore, the use of the DA algorithms enabled an increase of the measurement spatial resolution by a factor between 3 and 4. The errors of the velocity gradients were of the order of 10–15% of the peak vorticity magnitude. Accurate pressure reconstruction was achieved in the flow field, whereas the evaluation of the surface pressure revealed more challenging. As expected, lower errors were obtained for increasing seeding concentration. The difference of accuracy among the results of the different data assimilation algorithms was noticeable especially for the pressure field and the compliance with governing equations of fluid motion, and in particular mass conservation. The analysis of the flexible panel test case showed that the panel position could be reconstructed with micrometric accuracy, rather independently of the data assimilation algorithm and the seeding concentration. The accurate evaluation of the static pressure field and of the surface pressure proved to be a challenge, with typical errors between 3 and 20% of the free-stream dynamic pressure.

Field and theoretical evaluation of the thermal performance of evaporative cooling porous fibre roofs

Field and theoretical evaluation of the thermal performance of evaporative cooling porous fibre roofs

An apple fruit localization system based on accurate and flexible hand-eye pose acquisition for robotic harvesting

The accurate localization of fruits and vegetables is crucial for robotic harvesting systems, depending not only on the localization accuracy within the vision device frame but also on the precision of the hand-eye pose. Despite considerable research focusing on localization accuracy within the vision device frame, limited attention has been directed toward improving the accuracy of the hand-eye pose. Furthermore, current methods for acquiring an accurate hand-eye pose are often inflexible and difficult to apply for the users. Therefore, we propose an accurate and flexible hand-eye pose acquisition method to enhance the performance of an apple fruit localization system. This method begins by attaching a datum block with three marked points to the camera, and the camera pose relative to the datum block is then determined using an iterative least-squares algorithm in the proposed calibration system. Once calibrated, the camera with the attached datum block can be mounted on a harvesting robot. In this manner, users can easily acquire the hand-eye pose by introducing the robotic arm of the harvesting robot along with a probe to contact the marked points on the datum block, making the process more flexible and accessible. To validate the effectiveness of the proposed hand-eye acquisition method, extensive experiments were conducted using a self-designed apple harvesting robot. Comparative experiments demonstrated that our method significantly improved the accuracy of the fruit localization system, reducing the mean positioning error by at least 33.3% compared to the selected state-of-the-art methods. Overall, the system achieved a mean localization accuracy of 14.0 mm under non-occluded conditions, with illuminance levels ranging from 8 to 20 kLux in a simulated orchard environment. Furthermore, field evaluation experiments in an apple orchard revealed that the localization success rate of the system exceeded 80.53%.

P-366. Investigation of a Bacteremia Outbreak in Dialysis Patients Linked to Closed System Needleless Valve Connectors

Abstract Background Closed system needleless connectors are commonly used in central venous access for long-term intravenous treatments like chemotherapy or dialysis. This paper details an investigation into a sudden rise in bacteremia among dialysis patients.Figure 1Monthly Rate of Central Line-Associated Bacteremia (#Bacteremia per 1,000 Central Line-Days), February 2023 to March 2024. Monthly Rate of Central Line-Associated Bacteremia (#Bacteremia per 1,000 Central Line-Days), February 2023 to March 2024. Methods Continuous surveillance of hospital-acquired infections (HAIs) in dialysis patients, as prescribed by Brazil's ANVISA. Monthly data analysis revealed an increase in the rate of central line-associated bacteremia in February 2024, which worsened in March (Fig. 1). To define the outbreak, we compared the incidence of bacteremia from the previous period (Feb/2023 to Jan/2024) to the current period (Feb-March/2024). Investigation of the outbreak commenced in February itself.Figure 2Comparative Analysis of Bacteremia Incidence: Previous Period (February 2023 to January 2024) vs. Current Period (February to March 2024). Results The outbreak was clearly defined, with the risk of bacteremia significantly doubling from February to March 2024 (Fig. 2), primarily caused by Staphylococcus species. After interviewing dialysis service professionals about changes in practices, we discovered that a new brand of closed-system valve connectors, purchased from China, began to be used on January 30, 2024. Tests and field evaluations revealed an accumulation of blood in the catheter hub, which could indeed have compromised the integrity of the accesses and facilitated bacterial growth (Fig. 3). The Infection Control and Hospital Epidemiology team suggested discontinuing the use of the device to assess whether there would be a decrease in the number of bacteremia cases. However, due to the high number of devices in stock, it continued to be used throughout the month of March, resulting in a further increase in infection cases. Due to the impact caused by the increase in bacteremia cases, the team decided to suspend the use of all valved devices after the first weeks of April. Consequently, after April 10th, the device was definitively discontinued in the department. The discontinuation of the device resulted in a decrease in the number of infections in April. By April 25th, the total number of bacteremia was 8 cases, of which 6 were reported between April 1st and 10th.Figure 3Tests and Field Evaluations Demonstrated Blood Accumulation in the Catheter Hub Using the New Brand of Closed-System Valved Connectors. Conclusion It was possible to link the use of the Chinese-made closed-system valved connector to an increase in the number of bacteremia cases, and its discontinuation resulted in a significant reduction in HAIs. Disclosures All Authors: No reported disclosures

Application of an Equivalent Temperature Field for Emulating Thermal Autofrettage-Induced Residual Stresses in Thick-Walled Cylinder

Abstract The equivalent temperature field of residual stresses induced by autofrettage of thick-walled cylinders and spheres have been successfully implemented in a finite element method framework to study the crack growth in autofrettaged components. Thermal autofrettage is a potential alternative method for strengthening hollow cylinders against internal pressurization. The assessment of service life of thermally autofrettaged cylinders containing cracks is imperative when they are subjected to high pressure static or cyclic in-service loading. There the equivalent temperature field replicating the thermal autofrettage-induced residual stresses will serve as the input to the finite element method analysis to evaluate the important fracture parameters such as static fracture endurance and the rate of crack growth for predicting service life. This work presents evaluation of an equivalent temperature field by establishing an equivalence between the thermoelastic stress field and thermal autofrettage-induced residual stress field in a cylinder obtained from either an analytical or a numerical model. The evaluated equivalent temperature field is then used in a finite element method analysis to exemplify the replication of the original residual stresses generated by thermal autofrettage in SS304, aluminum cylinders and electroslag refined (ESR) steel gun barrel. It is found that the finite element stress solution due to the application of equivalent temperature field and the original analytical or numerical thermal autofrettage residual stress solution are in good agreement with less than 5% deviation in the case of SS304 and aluminum cylinders, and that in ESR steel barrel with less than 1% deviation.

Field evaluation of peanut cultivars to early leaf spot, late leaf spot, and southern blight at Stoneville, MS, 2023

Early and late leaf spot and southern blight, caused by the fungal pathogens Passalora arachidicola, Nothopassalora personata and Athelia rolfsii, respectively, are among the important diseases in peanut production regions of the United States. Leaf spot symptoms include lesions on leaves, petioles and stems often with a yellow halo in the case of early leaf spot, while southern blight symptoms include wilting and plant death. This report evaluates disease susceptibility within the Mississippi State Official Peanut Variety Trial located in Stoneville, MS during 2023. Results from these trials will assist U.S. peanut producers in selecting management options for these diseases.

A Pilot Field Evaluation of Dietary Ginger Zingiber officinale Effects on Immunity, Blood Metabolic Profile, and Disease Resistance in Labeo rohita Under Semi-Intensive Farming

A feeding trial was conducted for 120 days in a pilot field condition to evaluate ginger powder (GP; Zingiber officinale) as a feed supplement for Labeo rohita to improve immunity, blood metabolic profile, and resistance to Aeromonas hydrophila bacterial infection. The study was conducted following a complete randomized design in outdoor cemented tanks (20 m2) with a stocking density of 30 fish (average weight: 20.5 g) per tank. L. rohita fingerlings were divided into five groups and fed a diet with no GP supplementation (control diet; C) or a diet supplemented with 5 g (GP5), 10 g (GP10), 15 g (GP15), or 20 g (GP20) of GP per kg of the control diet. The results showed that fish well-being, determined by measuring the condition factor, remained higher than 1.0 for all the experimental groups. The condition factors of all the groups were not significantly different between the groups, suggesting GP had no negative impact on overall fish health. Immune responses significantly improved in the groups fed with diets supplemented with GP at doses of 10 to 15 g per kg of their diet, as seen in respiratory burst activity, total immunoglobulins, and lysozyme activity at 60 and 120 days. Blood metabolic variables, particularly the albumin level, tended to show some level of improvement in the GP15-fed group. However, the effect was not significant. Total protein and globulin levels and the albumin/globulin ratio were not significantly affected by dietary GP. Importantly, fish fed the GP15 diet showed the highest resistance to the A. hydrophila challenge. In conclusion, ginger powder holds promise as a health-promoting nutraceutical for farmed L. rohita, contributing to their sustainable farming.

Amplification of Secondary Flow at the Initiation Site of Intracranial Sidewall Aneurysms.

The initiation of intracranial aneurysms has long been studied, mainly by the evaluation of the wall shear stress field. However, the debate about the emergence of hemodynamic stimuli still persists. This paper builds on our previous hypothesis that secondary flows play an important role in the formation cascade by examining the relationship between flow physics and vessel geometry. A composite evaluation framework was developed to analyze the simulated flow field in perpendicular cross-sections along the arterial centerline. The velocity field was decomposed into secondary flow components around the centerline in these cross-sections, allowing the direct comparison of the flow features with the geometrical parameters of the centerline. Qualitative and statistical analysis was performed to identify links between morphology, flow, and the formation site of the aneurysms. The normalized mean curvature and curvature peak were significantly higher in the aneurysmal bends than in other arterial bends. Similarly, a significant difference was found for the normalized mean velocity ( ), the circumferential ( ), and radial ( ) velocity components between the arterial bends harboring the aneurysm than in other arterial bends. In contrast, the difference of means for the normalized axial velocity is insignificant ( ). Thirty cases with aneurysms located on the ICA were analyzed in the virtually reconstructed pre-aneurysmal state by an in-silico study. We found that sidewall aneurysm formation on the ICA is more probable in these arterial bends with the highest case-specific curvature, which are accompanied by the highest case-specific secondary flows (circumferential and radial velocity components) than in other bends.

The Formation of Cavansite and Pentagonite in the Wagholi Quarries, Pune, India

Formation conditions of dimorphic minerals cavansite and pentagonite were previously based on theoretical assumptions. In doing so, the associations with other minerals, especially zeolites, that actually occur in nature, were disregarded or incorrectly taken into account. As a result, formation conditions were assumed that are not consistent with those for the associated minerals in the Deccan Volcanic Province. This relates in particular to overestimated high pressure and temperature values, as well as chronological processes of alteration. Long-term field studies and evaluations of numerous samples led to the conclusion that cavansite and pentagonite formed under temperature (approx. 120 °C to 200 °C) and pressure (0.01–0.03 GPa) conditions that are relevant for the associated low-temperature zeolites. Integration of geological and petrographic conditions, as well as crystallization sequences enabled the presentation of a multi-stage mineralization model. It is also explained that, contrary to the original assumption, characteristic pentagonite fivelings are not formed from five, but from six individuals.

Toward Universal Embodied Planning in Scalable Heterogeneous Field Robots Collaboration and Control

ABSTRACTMulti‐robot systems offer substantial enhancements in efficiency, scalability, robustness, and flexibility for executing complex tasks through collaborative efforts. However, existing methodologies are constrained by their lack of generalizability, the need for extensive modeling, and most importantly, limitations in their applicability in complex scenarios. This paper presents a novel approach to multi‐robot task planning and coordination, introducing a comprehensive pipeline encompassing data generation, supervised fine‐tuning, and rigorous error analysis using the Multi‐Robot collaboration Error Diagnostic (MRED) metrics. Bridging the gap between natural language commands and physical groundings in robot collaboration tasks, we present MultiPlan: the first data set specifically designed for LLM fine‐tuning. The MultiPlan data set encompasses 100 distinct indoor and outdoor scenarios, ranging from office to garden. Experiments underscore the efficacy of the proposed methodology, including comparative analyses against state‐of‐the‐art LLMs and generalization studies on previously unseen tasks. Results reveal that the fine‐tuned model achieves a 24.8% relative improvement over the GPT‐4 model in addressing complex multi‐robot planning scenarios. We also conducted field evaluations in both office and urban settings to demonstrate the deployment performance of the proposed method. These results demonstrate the model's superior capabilities in task decomposition, error management, and adaptation to novel contexts.

Implementation Fidelity: The Disconnect Between Theory and Practice

The current paper combines a conceptual analysis of major reviews of implementation fidelity studies (e.g., Dane & Schneider, 1998; Mowbray et al., 2003; O’Donnell, 2008) with reflections on fidelity measurement practice in field evaluations. It claims that practice is impoverished by the failure to recognize the existence of competing conceptualizations of fidelity, rooted in different theoretical perspectives. Different evaluation contexts may be better matched to one or the other of these perspectives. Confusion about how fidelity should be defined in a given funding program or evaluation prevents evaluators from instituting a maximally useful fidelity measurement program. Difficulties inherent to creating high-quality fidelity measures contribute to the problem. The causes and consequences of this disconnect between fidelity theory and fidelity practice are discussed herein. Preliminary suggestions for solutions are advanced.

Field and Laboratory Performance of Cementitious Partial Depth Repair Materials in Cold Climates

Incompressible debris accumulating in pavement joints or cracks restricts the free expansion of pavement slabs during warm weather and generates excessive compressive stresses along the joint or crack faces. These stresses cause deterioration and spalling of slab corners and edges and accelerate the rate of pavement degradation. Partial depth repair is a preventative maintenance treatment which is commonly used early in the pavement service life to repair spalls and shallow deterioration and restore the intact pavement surface typically before excessive deterioration occurs. The selected repair material must be compatible with the environmental and load conditions. Replacing the deteriorated concrete with a durable material restores the structure integrity, improves the ride quality, and reduces moisture infiltration to subsurface layers of the pavement. The objective of this paper is to evaluate the performance of several rapid setting cementitious concrete repair materials in cold climates and to develop selection criteria for partial depth repair materials. Six repair materials were applied to a test section on a major arterial road in the City of Winnipeg in the summer of 2010. Pre- and post installation detailed condition surveys were conducted at the repair sites and the field evaluation will continue for the next two years. The field performance of the repair materials was evaluated according to: presence of transverse and longitudinal cracks, separation between the material and concrete slab, surface finish of the repair area, and deterioration of the repair material. Laboratory tests were conducted to evaluate the impact of freeze-thaw and wet-dry cycling on the bond strength between repair materials and regular concrete. Concrete cylinders were prepared in the laboratory. The prepared cylinders had a concrete-repair material interface slanted at 30 degrees from the loading axis. The specimens were subjected to freeze-thaw and wet-dry cycling separately. The degradation of the bond strength between repair material and concrete was evaluated from the compressive testing of the bond cylinders at different levels of freeze-thaw and wet-dry conditioning. Results of laboratory and field evaluation will be used to develop performance-based selection criteria for cementitious partial depth repair materials.

Field Evaluation of Fertilizer Rates for the Best Establishment of Young Eucalyptus gunnii Trees

Field Evaluation of Fertilizer Rates for the Best Establishment of Young Eucalyptus gunnii Trees

Design and Field Evaluation of an End Effector for Robotic Strawberry Harvesting

As the world’s population continues to rise while the agricultural workforce declines, farmers are increasingly challenged to meet the growing food demand. Strawberries grown in the U.S. are especially threatened by such stipulations, as the cost of labor for such a delicate crop remains the bulk of the total production costs. Autonomous systems within the agricultural sector have enormous potential to catalyze the labor and land expansions required to meet the demands of feeding an increasing population, as well as heavily reducing the amount of food waste experienced in open fields. Our team is working to enhance robotic solutions for strawberry production, aiming to improve field processes and better replicate the efficiency of human workers. We propose a modular configuration that includes a Delta X parallel robot and a pneumatically powered end effector designed for precise strawberry harvesting. Our primary focus is on optimizing the design of the end effector and validating its high-speed actuation capabilities. The prototype of the presented end effector achieved high success rates of 94.74% in simulated environments and 100% in strawberry fields at Farias Farms, even when tasked to harvest in the densely covered conditions of the late growing season. Using an off-the-shelf robotic configuration, the system’s workspace has been validated as adequate for harvesting in a typical two-plant-per-row strawberry field, with the hardware itself being evaluated to harvest each strawberry in 2.8–3.8 s. This capability sets the stage for future enhancements, including the integration of the machine vision processes such that the system will identify and pick each strawberry within 5 s.

Functional Responses of the Warehouse Pirate Bug Xylocoris flavipes (Reuter) (Hemiptera: Anthocoridae) on a Diet of Liposcelis decolor (Pearman) (Psocodea: Liposcelididae).

Psocids are difficult to manage using grain protectants and phosphine hence research on non-chemical control methods. This study evaluated the effectiveness of Xylocoris flavipes (Reuter) (Hemiptera: Anthocoridae) at managing Liposcelis decolor (Pearman) (Psocodea: Liposcelididae). The functional responses of adult♀ and nymphs of X. flavipes on a diet of nymphs, adult♂, and adult♀ of L. decolor were determined under laboratory conditions at 28 ± 1 °C, 63 ± 5% RH, and a 0:24 (L:D) photoperiod. Maximum likelihood estimates (MLEs) of a logistic regression analysis showed that the functional responses of the life stages of X. flavipes on diets of three stages of L. decolor were Holling Type II. Estimates of the attack rate (a), handling time (Th), maximum predation (K) per day, and predation efficiency (η) per day for the two predator life stages against each prey life stage showed that the adult♀ X. flavipes predation rate was better compared with the nymphs. The adult♀ X. flavipes per capita consumption rate and searching efficiency were also higher than those of the nymphs. The data showed adults of L. decolor are more favorable for adult♀ X. flavipes whereas their nymphs prefer nymphs of L. decolor. Field evaluation of X. flavipes is required for their incorporation into psocid pest management.

Magnetic Imaging Tools Scanner (MIT Scan-2) application in North America: Five Years After

MIT Scan-2 has been identified by the FHWA as a practical implementation-ready product that has the potential to improve quality of concrete pavements. Since MIT Scan-2 has been brought to the United States, evaluations of MIT Scan-2 have shown it to be a reliable tool for locating dowels with high accuracy for dowels inserted with cut dowel baskets or DBIs. This device was also found to be useful in qualitative measurement of uncut misaligned dowel baskets. The efficiency and ease of use of the device was also found to be robust fo application to investigations that require large amounts of measurements in a wide range of environments. Munerous field evaluations of typical concrete pavement sections have shown that with proper construction practices, the dowels can be placed at relatively low misalignment levels. This technology may help the contractor ensure that the dowel bars are installed properly. However, this paper does not provide guidelines for dowel misalignment, as those will be developed in the NCHRP 10-69 study to be completed in 2008.

Field evaluation of the delivery system of native predatory bug, <i>Eocanthecona furcellata</i> for the management of lepidopteran pests in pulse crops

Eocanthecona furcellata (Hemiptera: Pentatomidae) is predatory on most of the lepidopteran insect pests. This bug has been recorded in different regions of India from various crop ecosystems. In Uttarakhand, this predator has been found predating upon different pests of various crops viz. pulses, wheat, rice, soybean, maize, etc grown in plains, foothills, mid hills, valleys and high hills. The mass production technology of this predator has also been developed in the laboratory on hosts such as Spodoptera litura and Corcyra cephalonica. Further, the different release methods in crop fields and rates of release of this insect were studied on pulse crops. Cage experiments were conducted to evaluate the effective predacious stages of this bug and its field release doses in different pulse crop ecosystems. The experiments were carried out in the tarai region of Uttarakhand during 2020-2022. The results revealed that 4th and 5th nymphal instars as well as the adults were voracious feeders in the pulse ecosystem. The population of Maruca vitrata on mungbean and pigeonpea was reduced significantly by 4th and 5th nymphal instars as compared to other stages of the insect. Thus, the nymphal and adult stages were found to be appropriate to be employed for the management of insect pests in pulse crops. The experiments were also conducted on the dose determination in which different rates as 2, 3, 6, 9, 12 and 15 nymphs and adults per cage were used for the control of S. litura. The results revealed a 62.00 and 54.13% reduction of S. litura population in soybean, 60.89 and 62.50% in pigeonpea, 63.99 and 60.02% in mungbean in S. litura population was found at 10 days after release of the nymphs and adults of the bug respectively at the rate of 9 nymphs and 9 adults per cage. The present results indicate that the releasing rates of 9 nymphs and 9 adults per cage in the pulse ecosystem were satisfactory for suppressing S. litura population. This study will be of significant importance in achieving successful management of lepidopterous insect pests through field release of the predator at specified doses.