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journal1 ›› 2016, Vol. 32 ›› Issue (3): 299-304.DOI: 10.16409/j.cnki.2095-039x.2016.03.003

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Effects of Cotton Aphid Density on the Intraguild Predation among Three Ladybeetles (Coleoptera: Coccinelildae)

YANG Fan1,2, LU Yanhui2, XU Jianxiang1   

  1. 1. College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China;
    2. State Key Laboratory for Biology of Plant Diseases and Insect Pests/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2015-08-11 Online:2016-06-08 Published:2016-06-07

Abstract: The study investigated the influence of the densities of extraguild prey, cotton aphid Aphis gossypii, on the intraguild predation among three common coccinellids, Harmonia axyridis, Propylea japonica and Coccinella septempunctata in North China. The indoor experiment showed that the predation of coccinellid eggs decreased with the increase of the cotton aphid density. With the supplement of 20 and 200 aphids, the predation averagely decreased by 56.5% and 92.6% respectively compared to that without aphid prey. The field cage experiment indicated the similar trend. When the aphid density increased from 0 to 50 per plant, the egg predation averagely decreased by 42.0%, and that decreased by 56.9% with 200 aphids. The existence of cotton aphid significantly relieves the intraguild predation among these above three coccinellids, and the effect is augmented with the increasing prey aphid density.

Key words: Harmonia axyridis, Propylea japonica, Coccinella septempunctata, Aphis gossypii, extraguild prey, intraguild predation

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