The effects of some biorationals and chemical insecticides on beet armyworm, Spodoptera exigua Lepidoptera: Noctuidae in sugar beet fields
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عنوان دوره: سومین کنگره بین المللی حشره شناسی ایران
نویسندگان
Department of Plant Protection, Faculty of Agriculture, Khuzestan Agricultural Science and Natural Resources University, Mollasani, Ahvaz, Iran,
چکیده
The beet armyworm, Spodoptera exigua Hubner (Lepidoptera: Noctuidae), is one of the important polyphagous crop pests which has economic damage in sugar beet fields. It is usually controlled applying chemical pesticides. However, biorational insecticides may be useful alternatives to chemical insecticides in integrated pest management programs. In order to optimize the application of insecticides, short and long terms efficacies of azadirachtin (as a botanical insecticide), Bt (WP), Bt (EC) (as microbial insecticides) as well as deltamethrin (as a chemical insecticide) were investigated in an experimental sugar beet field during two growing seasons, 2015 and 2016, in Kiar city, Chahrmahal and Bakhtiri province. Experiments were carried out in a randomized complete block design with 5 treatments and 4 replications. Samplings were performed 1 day before treatment (DBT) and 1, 3, 5, 7 and 10 days after treatment (DAT) to estimate densities of S. exiguae larvae. Results showed that deltametrin significantly suppressed the pest population 1 DAT. However, azadirachtin and Bt (WP) significantly reduced the pest larvae population in 3-10 DAT similar to deltamethrin. Therefore, Bt (WP) and azadirachtin can be recommended as safer alternative insecticides to deltamethrin for application in sugar beet. Results of the study can be used for developing integrated pest management program in sugar beet fields.
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