Abstract
The aim of the current study was to evaluate the efficacy of five insecticides for controlling the primary insect pests of dry-season onions in Meskine, Far North of Cameroon. The goal was to identify the insecticide that ensures a better yield for late-transplanted dry-season onion crops. To achieve this objective, a trial was conducted using a completely randomized experimental block design, with six treatments replicated three times. The treatments consisted of Cypercal (Cypermethrin 120 g/L, Profenofos 600 g/L), Neem oil solution + Neem cake (Azadirachtin), Optimal (Acetamiprid 200 g/Kg), Pacha (Lambda-cyhalothrin 15 g/L, Acetamiprid 10 g/L), Rapax (Bacillus thuringiensis), and a control. Applications of the treatments were carried out using an ULVA sprayer on the leaves between 6 a.m. and 7 a.m. Observations focused on growth and yield parameters, which were evaluated based on the various treatments applied. Data collected were analyzed using STATGRAPHIC Centurion XVI.I software at a 5% significance rate. Results showed that among the four insect species recorded on the leaves, thrips were the most prevalent, constituting 33.37% of the total population, followed by caterpillars (23.82%), aphids (22.32%), and locusts (20.48%). The analysis of variance revealed that among the growth parameters, only plant height was significantly affected by the application of the different insecticides. The highest marketable bulb yield was achieved with Cypercal, yielding 13.53 tons per hectare, compared to the control’s 6 tons per hectare. Consequently, Cypercal has been identified as an effective alternative to Optimal, which is commonly used by growers to enhance yields of this dry-season crop.
Published Version
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