Age-stage, two-sex life table of European red spider mite, Panonychus ulmi (Koch) (Prostigmata:Tetranychidae) on mulberry varieties

摘要

To understand the influence of four mulberry varieties on the development and reproduction of the European red spider mite, Panonychus ulmi (Koch) (Prostigmata: Tetranychidae), age-stage two-sex life tables of P. ulmi on Goshoerami, KNG, Chinese white and Rokokuyaso varieties were constructed under ambient laboratory conditions during summer season of the year with an average temperature of 26.22 ± 2.23 °C, relative humidity of 70 ± 5% and photoperiod of 14:10 h (L: D). Panonychus ulmi developed comparatively better on KNG and Goshoerami varieties than the other two varieties, as indicated by high fecundity (45.05 ± 1.89 and 41.23 ± 1.66 eggs female1, respectively) and intrinsic rate of increase (0.165 ± 0.01 and 0.168 ± 0.03 day1, respectively). Lowest intrinsic rate of increase (r) was observed on Chinese white and Rokokuyaso (0.055 ± 0.03 and 0.057 ± 0.10 day-', respectively). Total development time of immature females was shortest on KNG than on the other varieties. Immature survival wassignificantly higher on KNG and Goshoerami varieties (76.76 ± 7.59 and 72.96 ± 8.21%, respectively) and was lower on Chinese white and Rokokuyaso (46.76 ± 9.00 and 43.32 ± 8.71%, respectively). Based on all the above parameters, KNG and Goshoerami were found as most suitable varieties for P. ulmi than Chinese white and Rokokuyaso.