The development and fecundity of Tetranychus urticae Koch (Acariformes : Tetranychidae) on four different plants and their relationship with the chemical components of plant leaves
Xue-Hui, L.; Zhong-Xin, L.; Shu-Yan, Y.; Yuan-Hui, P.; Feng, K.; Xu-Gen, S.
Acta Entomologica Sinica 50(11): 1135-1139
Effects of Malas pumila Mill., Sambucus williamsii Hance, Melia azedarac L. and Rhas typhina L. on the development and fecundity of Tetranychus urticae Koch were investigated by means of leaf disk rearing method. Kjeldahl method, Soxhlet extraction method, Anthrone colorimetry, and Folin-Denis colorimetry were also applied to measure the contents of nitrogen, crude fat, soluble sugar and tannin, respectively. The results showed that M. pumila and S. williamsii with high content of nitrogen (2.98% and 4.00%, respectively) and sugar (19.92% and 12.81%, respectively) were suitable for the development and fecundity of T. urticae. R. typhina with the lowest content of nitrogen and soluble sugar and the highest content of tannin (11.45%), however, was baneful to T. urticae. Therefore it can be concluded that tannin, as the secondary compound of plants, may play important role in resistance of plants to mites.