Evaluation of the Effectiveness of New Phytosanitary Protection Programs in Cotton Crops Adapted to Jassids

Abstract

In recent years, jassids have become a problem for cotton and the current control program for this pest seems ineffective. This study was therefore initiated with the objective of evaluating the effectiveness of three new phytosanitary protection programs against jassids. Trials were conducted at the Nambingué observation post. The study designs were Fisher blocks with 5 objects and 4 replications. Each elemental plot had a length of 10 m and a width covering 10 lines, 8 of which were treated. The spacing between rows was 0.8 m. The distance between patches on a line was 0.4 m. The distance between blocks was 2 m. Six insecticide treatments were carried out. Treatments were started on the 45th day after cotton emergence, at 14-day intervals. These three new programs, which differ according to the composition and positioning of the active substances, were tested during two years in a fisher block design with four repetitions. Two programs, labelled programs B and C, had an efficacy threshold greater than 80%. Program B was characterized by a positioning spiromesifen or chlorantraniliprole in T1 and T2, cypermethrin + abamectin in T2 and T3 and spinetoram + sulfoxaflor in T5 and T6 respectively. And program C was characterized by a positioning spinetoram + sulfoxaflor in T1 and T2, Deltamethrin + chlorpyrifos ethyl in T3 and T4 and dinotefuran 14% + alphacypermethrin 22% in T5 and T6 respectively. They both contributed to a significant reduction in jassid outbreaks during the two years of experimentation. Programs B and C can be used as an alternative to the extension program to manage resistance.