Controlling Pectinophora gossypiella and Earias insulana in Cotton Filed by the 12th Generations of Trichogramma evanescens Reared in Normal Conditions in the Laboratory

Document Type : Original Article

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Plant Protection Research Institute, Agriculture Research Center, Dokki, Giza, Egypt

Abstract

A field trial was done at 2018-2019 cotton seasons to evaluate the parasitoid of Trichogramma evanescens (Westwood) local strain which rearing for 12th generation under normal conditions in the laboratory; compared with the conventional insecticide applications profenofos (organophosphorus compound); for controlling the two pests pink bollworm, Pectinophora gossypiella (Saund.) and spiny bollworm, Earias insulana (Boisd.) on infested cotton green bolls. The real control effect (pest population and infestation reductions percentages) by T. evanescens was determined through the weekly infestation level of green cotton bolls comparing with the control. When T. evanescens was released in comparison with profenofos insecticide treatment, caused more reduction of pink and spiny bollworms infestation when used as 3&5 cards than profenofos comparing with untreated at two seasons, respectively. Pest control by releasing T. evanescens levels was relatively lower as 1 card parasitoid than 3 as well as 5 cards. Also, the infestation reduction was high when this parasitoid was releasing in cotton earlier in the season without any other control agents.





The obtained results show that the release of T. evanescens to control pink and spiny bollworms is biologically effective and could be used as an important agent in integrated pest management programs. 

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