The selective toxicity of insecticides to the cabbage aphid Brevicoryne brassica Linnaeus (Hemiptera: Aphididae) and its parasitoid, Diaeretiella rapae (McIntosh): laboratory and field studies.

Dakhli, Manar Omar; Balah, Mohamed Abdelaziz; Hussein, Salah M.

doi:10.21608/jmr.2022.175611.1096

The selective toxicity of insecticides to the cabbage aphid Brevicoryne brassica Linnaeus (Hemiptera: Aphididae) and its parasitoid, Diaeretiella rapae (McIntosh): laboratory and field studies.

Document Type : Research Articles

Authors

¹ Plant Protection Dept., Faculty of Agriculture, Minia University, Minia Egypt

² Plant protection dept. Desert Rechearch Center Mataria Cairo, Egypt

³ Plant protection dept. Faculty of Agric, Minia University

10.21608/jmr.2022.175611.1096

Abstract

Abstract
Effective management of the cabbage aphid, Brevicoryne brassicae, on cabbage plants depends on adequate insecticide efficacy and conservation of its parasitoid, Diaeretiella rapae and useful arthropods in cabbage ecosystem. Indoxicarb, imidacloprid, and emamectin benzoate were applied at laboratory with two methods of application (emmersion and thin layer technique) with several dosage rates on aphid and its parasitoids’ and in Pots and small field plots on cabbage plants to determine the selectivity of these common insecticides against Diaeretiella rapae and to know their effect on the diversity and equitability on cabbage ecosystem. Results showed that the application of three tested insecticides caused satisfactory toxicity and rapid in aphid numbers when treated with thin layer and immersion technique and less toxic on the mommies of D. rapae. Imidacloprid and indoxicarb were highly selective against D. rapae (141.7and 127.4%) selective ratio. Emamectin benzoate was not selective (98.58%).. The results of residual toxicity showed that No significant differences between insecticides treatments were observed when mommies treated with immersion method All products were classed as IOBC category 2 slightly harmful) except emamectin benzoate after one day post treatment showed moderately harmful category. Results concluded that indoxicarb can be used in cabbage aphid integrated control in integration with parasite D. rapae, It was selective in the field test and medium selective on other beneficial arthropods and haven’t any effect on diversity of beneficial arthropods and equitability in cabbage ecosystem.

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