Life history parameters of Phthorimaea operculella (Lep.: Gelechiidae) on tuber of some potato germplasms

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Abstract

Potato tuberworm, Phthorimaea operculella (Zeller), is an important pest of potatoes in the storage. In this study, the life history parameters of P. operculella were studied on eight potato germplasms including five potato cultivars (Agria, Savalan, Morene, Sprit, Kondor) and three potato clones (PI 397097-2, PI 396124 and PI 397082-2) in the laboratory at 25 ± 1°C, 65 ± 5% RH and 0: 24 (L: D) h. Feeding on the tubers of different potato germplasms had significant effect on development of immature stages, adult longevity and life span of P. operculella. The highest immature stage development time, the lowest survival rate of immature stages and the lowest fecundity were observed on PI 397097-2, and in contrast, the shortest immature stage development time, the highest survival rate of immature stages and the highest fecundity were observed on Savalan. The lowest intrinsic rate of natural increase (rm = 0.135), the lowest finit rate of increase (λ = 1.149), the lowest net reproductive rate (R0 = 15.4), the highest mean generation time (T = 20.1 days) and the highest doubling time (DT = 5.1 days) were observed on PI 397097-2. Because of longer immature development time and lower intrinsic rate of natural increase, finit rate of increase and net reproductive rate of the potato tuberworm on PI 397097-2, it was concluded that this clone is less suitable host for the potato tuberworm compared to other potato germplasms studied in this research. Therfore, it can be used in potato tuberworm IPM programs.

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Journal of Entomological Society of Iran
Volume 32, Issue 2
March 2013
Pages 105-125

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