“Determination of the bioefficacy of four vector control products against the major malaria vector Anopheles arabiensis (Diptera: Culicidae) under laboratory and semi-field conditions in Ethiopia” Syngenta Crop Production Ag (ISO Cycloceram)
Laboratory Bioassays
Conducting standardized WHO tube tests or CDC bottle bioassays to evaluate the immediate toxicity and knockdown effects of the four vector control products (including ISO Cycloceram) against Anopheles arabiensis. This will determine baseline efficacy and detect potential insecticide resistance.
Semi-Field Evaluations
Performing experimental hut trials or cone/cylinder tests on treated surfaces (e.g., nets, walls) under semi-controlled outdoor conditions to assess residual efficacy, repellency, and mortality rates over time. This mimics real-world exposure while maintaining scientific control.
Resistance Monitoring
Analyzing mosquito populations for insecticide resistance mechanisms (e.g., kdr mutations, metabolic detoxification) using molecular and biochemical assays. This helps determine whether resistance could compromise product effectiveness and informs future malaria control strategies.
Study Background
Project Background Malaria remains a major public health challenge in Ethiopia, with Anopheles arabiensis being the primary vector responsible for transmission. Despite ongoing control efforts, the emergence of insecticide resistance in mosquito populations threatens the effectiveness of current interventions. There is an urgent need to evaluate new vector control products to ensure sustainable malaria prevention strategies. This study focuses on assessing the bioefficacy of four vector control products, including Syngenta’s ISO Cycloceram, against Anopheles arabiensis under controlled laboratory and semi-field conditions in Ethiopia. The findings will provide critical d ata to guide evidence-based decisions on insecticide deployment and resistance management. The project aims to generate comparative data on the efficacy, residual activity, and potential resistance-breaking properties of these products. By testing under both laboratory and semi-field conditions, the study will simulate real-world scenarios while maintaining scientific rigor. ISO Cycloceram, a novel formulation, will be evaluated alongside other insecticides to determine its potential as an alternative or complementary tool for malaria vector control. The results will contribute to Ethiopia’s national malaria control strategy by identifying effective, long-lasting solutions to combat insecticide resistance and reduce malaria transmission.
Field Work
Field Activity for Bioefficacy Determination of Vector Control Products The field component of this study will be conducted in selected malaria-endemic areas of Ethiopia, focusing on evaluating the performance of four vector control products, including Syngenta's ISO Cycloceram, against Anopheles arabiensis under semi-field conditions. Experimental huts or specially designed enclosures will be used to simulate real-world exposure scenarios, with surfaces treated with the test products according to manufacturer specifications. Mosquitoes will be introduced into these enclosures to assess parameters such as mortality rates, blood-feeding inhibition, and repellency effects over specified time intervals (e.g., 24-hour, 72-hour, and monthly follow-ups). This approach allows for the evaluation of residual efficacy and durability under local environmental conditions, including temperature, humidity, and exposure to sunlight, which are critical for determining the operational feasibility of these products in actual malaria control programs. In parallel, wild Anopheles arabiensis populations will be collected from the study sites using standard methods such as pyrethrum spray catches (PSC) or CDC light traps to assess baseline susceptibility to the test products. These field-collected mosquitoes will be compared with laboratory-reared susceptible strains to detect potential resistance patterns. Data on mosquito density, species composition, and resting behavior will also be recorded to contextualize the findings. The semi-field trials will adhere to ethical and safety guidelines, ensuring minimal environmental impact while generating robust evidence to inform national malaria vector control strategies. The results will help identify the most effective products for scaling up in resistance-prone areas, contributing to Ethiopia's goal of malaria elimination.
