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Your Position :Home->Past Journals Catalog->2019年56 No.5

Effect of imidacloprid on Harmonia axyridis, a biological control for pest insects
Author of the article:WANG JiaJia;FU Xue;WANG Xue;MA YanLong;YE Le-Fu
Author's Workplace:1. College of Agriculture, Northeast Agricultural University, Harbin 150030, China; 2. College of Agricultural Resources and Environment, Heilongjiang University, Harbin 150080, China
Key Words:imidacloprid; Harmonia axyridis; sub-lethal concentration; growth and development; preying functional responses
Abstract: [Objectives]  The non-lethal effects of pesticides on the natural enemies of pest species should be an important consideration in assessing the benefits of pesticides. [Methods]  Soybean aphids treated with a sub-lethal concentration (LC25) of imidacloprid were fed to H. axyridis, and the developmental duration, survival ratio, pupal weight and functional predatory response of different developmental stages of H. axyridis were measured. [Results]  (1) Regardless of the developmental stage of the G0 generation of H. axyridis that was fed imidacloprid treated aphids, their development duration was significantly prolonged and their pupal weight and survival ratio were significantly reduced. (2) Irrespective of whether the 1st, 3rd or 4th instar of the G0 generation was the first to feed on imidacloprid treated aphids, the 3rd instar period of the G1 generation was significantly extended, and the 4th instar period was significantly shortened. When the 4th instar of the G0 generation was the first to feed on imidacloprid treated aphids, the developmental duration of the G1 generation was significantly extended from the 1st to the 3rd instar. Irrespective of the stage at which the G0 generation began to feed on imidacloprid treated aphids, the pupal weight of the G1 was significantly reduced, although the survival ratio of G1 larvae did not change significantly. (3) Feeding H. axyridis imidacloprid treated aphids significantly reduced the maximum predation rate of the 2nd, 3rd and 4th instars, but there was no significant change in that of 1st instar larvae or adults. [Conclusion]  Feeding H. axyridis aphids containing a sub-lethal concentration of imidacloprid affected the growth and development of the G0 and G1 generations, and also affected their predatory ability, thus affecting the effectiveness of the H. axyridis as a biological control. Non-lethal effects on non-target insects should be considered when assessing the suitability of insecticides.
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