Sublethal effects of imidacloprid on the predatory seven-spot ladybird beetle Coccinella septempunctata.
The seven-spot ladybird beetle, Coccinella septempunctata, is a major natural enemy of aphids in the field and in greenhouses in China and is part of integrated pest management (IPM). Imidacloprid, a highly efficient insecticide that not only kills aphids at lethal concentrations, but also can cause various sublethal effects in nontarget organisms. To strengthen IPM and its sustainability, it is important assessing possible side effects on natural enemies. When the effects of sublethal concentrations (LC5 and 10%LC5) of imidacloprid on C. septempunctata were evaluated, the adult longevity was shortened by 23.97 and 28.68 %, and the fecundity reduced by 52.81 and 56.09 % compared to control population. In the F1generation (i.e., the progeny of the exposed individuals), the juvenile development was slower by 1.44 days and 0.66 days, and the oviposition period was shortened by 10 and 13 days, respectively. The fecundity of the F1generation decreased by 17.88, 44.03 and 51.69 % when exposed to 1%LC5, 10%LC5, and LC5, respectively. The results of demographical growth estimates showed that the intrinsic rate of increase (rm) and net reproductive rate (R0) were lower in C. septempunctata populations that had been exposed to sublethal concentrations of imidacloprid. The results emphasize the importance of assessing side effects of low imidacloprid concentrations on such predator species, even at the transgenerational level.
Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forest Science, Beijing, 100097, China.
Da
D
Xiao
Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forest Science, Beijing, 100097, China.
Jing
J
Zhao
Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forest Science, Beijing, 100097, China.
Xiaojun
X
Guo
Institute for the Control of Agrochemicals, Ministry of Agriculture, Beijing, 100125, China.
Hongying
H
Chen
Institute for the Control of Agrochemicals, Ministry of Agriculture, Beijing, 100125, China.
Mengmeng
M
Qu
Institute for the Control of Agrochemicals, Ministry of Agriculture, Beijing, 100125, China.
Weigang
W
Zhai
INRA (French National Institute for Agricultural Research), UMR 1355-7254 Institut Sophia Agrobiotech, Univ. Nice Sophia Antipolis, CNRS, 400 Route des Chappes, Sophia-Antipolis, 06903, France.
Nicolas
N
Desneux
University of Catania, Department of Agriculture, Food and Environment, via Santa Sofia 100, Catania, 95123, Italy.
Antonio
A
Biondi
Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forest Science, Beijing, 100097, China.
Fan
F
Zhang
Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forest Science, Beijing, 100097, China. wangsu@baafs.net.cn.
Su
S
Wang
D000818:Animals; D001517:Coleoptera / Q000187:drug effects* / Q000502:physiology; D007093:Imidazoles / Q000633:toxicity*; D007306:Insecticides / Q000633:toxicity*; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000633:toxicity*; D059551:Toxicity Tests, Subacute
D007093:Imidazoles; D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; C082359:imidacloprid
Generalist predator; Neonicotinoid; Population dynamics; Sublethal effects; Transgenerational effects
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