Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8853800 | Ecotoxicology and Environmental Safety | 2018 | 6 Pages |
Abstract
The seven-spotted ladybird beetle, Coccinella septempunctata L., as a dominant predator of aphids, has played a crucial role in integrated pest management (IPM) strategies in agricultural ecosystems. To study the risk of insecticides to C. septempunctata, the neonicotinoid clothianidin was selected for evaluation of its influence on C. septempunctata at lethal and sublethal doses. The LR50 (application rate causing 50% mortality) in the exposed larvae decreased from 19.94 to 5.91â¯g a.i. haâ1, and the daily HQ (hazard quotient) values increased from 3.00 to 10.15, indicating potential intoxication risks. We also determined NOERs (No Observed Effect application Rates) of clothianidin on the total developmental time (10â¯g a.i. haâ1), survival (2.5â¯g a.i. haâ1) and pupation (5â¯g a.i. haâ1). Moreover, clothianidin at a NOER of 2.5â¯g a.i. haâ1 did not profoundly affect adult emergence, fecundity or egg hatchability. The total effect (E) assessment also showed that clothianidin at 2.5â¯g a.i. haâ1 was slightly harmful to C. septempunctata. These results suggested that clothianidin would impair C. septempunctata when applied at over 2.5â¯g a.i. haâ1 in the field. Conservation of this biological control agent in agricultural ecosystems thus requires further measures to decrease the applied dosages of clothianidin.
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Authors
Jiangong Jiang, Zhengqun Zhang, Xin Yu, Dicheng Ma, Caihong Yu, Feng Liu, Wei Mu,