Role of parasitoids, conventional insecticides and ecdysone agonists in regulating population of Cassida vittata vill in egyptian sugar beet fields [electronic resource].

Includes reference.

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 ratio was 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: Cassida vittata, Monorthochaeetaa nigra, Dinarmus laticeps, Ecdysone agonists, Beta vulgaris

Summary in Arabic.