%A ZHANG MengDi,YAN JunJie,GAO YuLin %T The Adaptive Analysis of Phthorimaea operculella to Different Potato Tuber Varieties %0 Journal Article %D 2021 %J Scientia Agricultura Sinica %R 10.3864/j.issn.0578-1752.2021.03.008 %P 536-546 %V 54 %N 3 %U {https://www.chinaagrisci.com/CN/abstract/article_21338.shtml} %8 2021-02-01 %X

【Objective】Potato tuberworm (Phthorimaea operculella) is an important pest on potatoes, which seriously affects the quality and value of potatoes. The objective of this study is to clarify the adaptability of P. operculella on different potato tuber varieties, and to provide a basis for screening resistant potato varieties and developing effective integrated pest management strategy.【Method】To evaluate the adaptability of P. operculella on different tuber varieties and screen the high natural-resistance tubers, in this study, four varieties (Xiabodi, Longshu No. 4, Longshu No. 12 and Kexin No. 17) which were planted in a large scale at present were selected as tested materials to determine the development and population parameters of P. operculella on different tuber varieties using an age-stage specific two-sex life table.【Result】There were significant differences in larval stage, pupal stage and female longevity of P. operculella feeding on different tuber varieties. Compared with those fed on Xiabodi, Longshu No. 4 and Longshu No. 12, those fed on Kexin No. 17 exhibited significantly longer larval stage (15.18 d) and pupal stage (8.10 d), and the female longevity (8.46 d) was shorter than the other three varieties. Moreover, the longevity of male was significantly higher than female in a same variety. The fecundity of P. operculella feeding on Xiabodi (235.06 eggs) and Longshu No. 4 (254.48 eggs) was significantly larger than that fed on Kexin No. 17 (165.71 eggs). In addition, there were significant differences among intrinsic rate of increase (r), finite rate of increase (λ), net reproductive rate (R0) and mean generation time (T) of P. operculella feeding on different tuber varieties. The r, λ, R0 values of P. operculella fed on Kexin No. 17 (r=0.108, λ=1.125, R0=26.513) were significantly lower than those on the other three tuber varieties, and T value of P. operculella fed on Kexin No.17 (30.28) was significantly higher than those on the other three tuber varieties. Larvae feeding preference experiments showed that the larvae fed on Xiabodi and Longshu No. 4 in preference to Kexin No. 17. With the increase of age, the selectivity gradually decreased. 【Conclusion】There was a different adaptability of P. operculella among different potato tuber varieties. Xiabodi and Longshu No. 4 are the most suitable hosts, followed by Longshu No. 12, and Kexin No. 17 is the least suitable host. In areas where P. operculella is seriously damaged on potato field system, planting potato varieties with low adaptability can be selected as an important strategy for reducing population of P. operculella in the field.