Application of biopesticides on Helicoverpa assulta and Helicoverpa armigera in tobacco fields

In order to control tobacco pests using green technologies and to clarify the control efficacies of 8 biological pesticides on Helicoverpa assulta and Helicoverpa armigera, field experiments were conducted in two consecutive years. The results showed that all the pesticides tested had certain control efficacies on Helicoverpa assulta and Helicoverpa armigera. The control efficacies of 1.0×10¹¹ spore/mL Empedobacter brevis SC, 0.5% matrine AS and 32 000 IU/mg Bacillus thuringiensis WP were over 80% after a single application and were over 99% after two applications. The control efficacies of 0.3% azadirachtin EC, 10% spinosad SC, 2.0×10¹⁰ PIB/mL Helicoverpa armigera Nucleopolyhedrovirus SC, 1.0×10¹⁰ PIB/g Mamestra brassicae Nucleopolyhedrovirus WP, 0.5% veratrine SL were over 80% after two applications. In addition, the yield and output value of tobacco exposed to 8 biopesticides were higher than those exposed to water (the control). Therefore, these biological pesticides can be used to control Helicoverpa assulta and Helicoverpa armigera in tobacco fields.