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Abstract
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 female−1, respectively) and intrinsic rate of increase (0.165 ± 0.01 and 0.168 ± 0.03 day−1, respectively). Lowest intrinsic rate of increase (r) was observed on Chinese white and Rokokuyaso (0.055 ± 0.03 and 0.057 ± 0.10 day−1, respectively). Total development time of immature females was shortest on KNG than on the other varieties. Immature survival was significantly 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.
Acknowledgements
Authors are thankful to University Grants Commission (UGC), New Delhi, for providing the financial assistance under UGC Research Fellowship in Science for Meritorious Students Scheme (Fellowship No. F.4-1/2006 (BSR)/7-97/2007(BSR), 26, June, 2012) to the senior author. We are highly indebted to the Jiwaji University, Gwalior, and the Director, CSR&TI, Central Silk Board, Pampore, J&K, for providing all the support for this study.