The effects of Tetranychus urticae′s eggs and webs on the development

Author of the article:YUE zhen, ZHI Junrui, TIAN tian

Author's Workplace：Institute of Entomology, Guizhou University

Key Words：Frankliniella occidentalis, Tetranychus urticae, predation, development, reproduction

Abstract：In order to assess the effects of egg and web produced by Tetranychus urticae on Frankliniella occidentalis, the development, survival rate and reproduction of F. occidentalis were studied on three treated bean leaves (healthy leaf, bean leaf with the eggs of T. urticae, bean leaf with the eggs and webs of T. urticae) and life table parameters were calculated. The results showed that F. occidentalis developed fastest on bean leaves with the eggs of T. urticae, the immature period was 11.35 days and it was significantly shorter than the other two treatments. The lowest survival rate was 63% when F. occidentalis feeding on bean leaves with the eggs and webs of T. urticae. The longevity and reproduction of adult F. occidentalis were not significantly different among three treated bean leaves. The intrinsic increase rates (rm) of experimental population of F. occidentalis were 0.1779, 0.1827 and 0.1710 on healthy bean leaf, bean leaf with the eggs of T. urticae, bean leaf with the eggs and webs of T. urticae respectively. The results indicate that the development period of F. occidentalis could shorten when it fed on the eggs of T. urticae, which was beneficial to its population growth；and the webs of T. urticae on the bean leaves could reduce the survival rate of F. occidentalis.