Role of Parasitoids, Conventional Insecticides and Ecdysone Agonists in Regulating Population of Cassida vittata Vill in Egyptian Sugar Beet Fields

Document Type : Original Article

Authors

Plant Protection Department, Faculty of Agriculture, Tanta University, Egypt

Abstract

This study was carried out at the experimental farm of Sakha Agricultural Station, Kafr El-Sheikh Governorate for three successive seasons (2017/2018, 2018/2019 and 2019/2020). The study aimed to monitor seasonal abundance of Cassida vittata Vill. (Coleoptera: Chrysomelidae) and its hymenopterous parasitoids, Monorthochaeetaa nigra Blood (Trichogrammatidae) and Dinarmus laticeps (Pteromalidae). Further, role of ecdysone agonists compounds in reducing C. vittata numbers and their adverse effect on these parasitoids in comparison with the conventional insecticides. Results proved that population density of C. vittata and its parasitoids gradually increased towards the end of the season resulting in highly positive significant correlations between this   insect and its parasitoids. General egg-parasitoid of M. nigra to host ratiowas 1:1.88 and 1:1.96, while it was 1:1.61 and 1:1.44 for larval-pupal parasitoid D. laticeps during 2018/2019 and 2017/2018 seasons, respectively. Lastly, ecdysone agonists were efficient against C. vittata, whereas it were almost safer to parasitoids than conventional insecticides. Thus, C. vittata parasitoids and ecdysone agonists may be used for integrated pest management  programs for this serious insect.

Keywords

Journal of Plant Protection and Pathology
Volume 12, Issue 9
September 2021
Pages 569-573

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