COMPARISON OF EFFICIENCY AND SELECTIVITY OF THREE BIO-INSECTICIDES FOR THE PROTECTION OF TOMATOES IN BURKINA FASO

摘要

The search for less toxic products and alternative methods is a need to elaborate integrated control strategies for growing tomatoes in Burkina Faso to reduce the dependence of farmers on pesticides. A trial was carried out in the village of Kouka, from December 2015 to March 2016, to assess the effectiveness and action spectrum of biopesticides on several key pests of tomato (Solanum lycopersicum L.) in Burkina Faso, namely two Lepidoptera caterpillars [Helicoverpa armigera (Hub.) and Utetheisa pulchella L.) and whiteflies (Bemisia tabaci (Genn.)). The effectiveness of the three products already sold in the country has been evaluated: BIO K 16 (1.5 kg/ha), H-N (3 L/ha) and PiOL (3 L/ha). In the aim to cover the spectrum of pests, and thus coming closer to Integrated Pest Management practical conditions, each biopesticide has been applied in association with abamectine, an insecticide-acaricide (ACARIUS 18 EC, 1 L/ha). In general, all treatments resulted in significant protection of the tomato fruit against caterpillars of moths, but had no effect on Bemisia tabaci. The combination Bacillus thuringiensis-abamect'me has provided both the best protection of the fruits and the highest yield (19.6 T/ha). This combination could be recommended as part of IPM in tomato cultivation.