n African Entomology - Life table parameters of Koch (Acari : Tetranychidae) on different bean varieties

Volume 23, Issue 2
  • ISSN : 1021-3589



The two-spotted spider mite Koch (Acari: Tetranychidae) is a cosmopolitan pest of many greenhouse and field crops worldwide. Host plant quality affects the development, survival and fecundity of The life table parameters of on three country bean varieties (L.), namely IPSA Seam 1, BARI Seam 1 and Kartica, were maintained at 25 ± 2 °C, 65 ± 5 % relative humidity (RH) and a photo period of 16:8 (L : D) in a growth chamber. The mean immature development time of from egg to adult was significantly longer on IPSA Seam 1 than on the other two varieties. There were significant variations in fecundity and longevity which resulted in large differences on population growth parameters like the intrinsic rate of natural increase (), net reproductive rate (), finite rate of increase () and doubling time (). Kartica and BARI Seam 1 were the most suitable host for with r = 0.230 and 0.223 (offspring/female/day), respectively. The slowest population growth was observed on IPSA Seam 1 with r=0.197. The findings of the current study indicated that IPSA Seam 1 is a less suitable variety to two-spotted spider mite compared to the other two varieties. Furthermore, these results may lead to finding and screening process of comparatively resistant country bean varieties to be used in the management of

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