Negative Effects of the Four Insecticides on Coccinella septempunctata Linnaeus and Trichogramma dendrolimi Matsumura

doi:10.16409/j.cnki.2095-039x.2019.04.009

Abstract

Abstract: Coccinella septempunctata Linnaeus and Trichogramma dendrolimi Matsumura are important natural enemies used in biological control of many pests. The safety and acute toxicity of four insecticides on the 2^rd instar larvae of C. septempunctata and adults of T. dendrolimi were evaluated using the contact film method in the laboratory. Results indicated that the tested pesticides differed in their toxicities against the 2^rd instar larvae of C. septempunctata. The formulation of 37% bifenthrin and clothianidin (EC), 45% imidacloprid and chlorfenapyr (EC), and 20% emamectin benzoate and indoxacarb showed LR₅₀ of 0.0327, 5.0 and 1.25 g a.i./hm² against C. septempunctata larvae respectively. The 24% chlorfenapyr and emamectin benzoate (EC) showed a high risk with LR₅₀ of 6.90 g a.i./hm², while the other three insecticides showed extremely high risks. As for T. dendrolimi, 37% bifenthrin and clothianidin (EC), 24% chlorfenapyr and emamectin benzoate (EC), 45% imidacloprid and chlorfenapyr (EC), 20% emamectin benzoate and indoxacarb, and exhibited LR₅₀ of 2.35×10⁻³, 0.0129, 6.46×10⁻³ and 0.127 g a.i./hm², respectively, all of extremely high risks. This study provides insight into the risk of the tested pesticides to C. septempunctata and T. dendrolimi.

Key words: biological control, chemical control, acute toxicity, safety assessment

CLC Number:

S476

GUO Zhixin, JIANG Hongyun, ZHANG Lan, MAO Liangang, ZHANG Yanning. Negative Effects of the Four Insecticides on Coccinella septempunctata Linnaeus and Trichogramma dendrolimi Matsumura[J]. Chinese Journal Of Biological Control, 2019, 35(4): 542-547.

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