Effects of corn cultivar on Tetranychus truncatus Ehara (Acarina:Tetranychidae) population parameters

Abstract

Abstract: The laboratory study at 28 ℃ showed that on four different corn cultivars,the durations of ovum,nymph and pre-oviposition,adult longevity,fecundity,egg production per day,net reproductive rate (R₀),finite rate of increase (λ),intrinsic rate of increase (r_m),mean generation time (T),and the days needed to double population size (DDP) of Tetranychus truncatus were significantly different.The hatching rate on Zea mays cv.Zhongdan 2,Nongda 108,Chidan 202 and Badan 3 was 95.8%,94.0%,90.0% and 84.0%,and the survival rate on these cultivars was 90.5%,86.0%,84.0%,and 72.0%,respectively.All the survival curves were of Deevey Ⅰ.The net reproductive rate (R₀) was the highest on Zhongdan 2,and the lowest on Badan 3.The mite displayed a decreasing preference in order of Zhongdan 2> Nongda 108> Chidan 202> Badan 3.

Key words: Tetranychus truncates, Corn, Survival curve, Population parameters

CLC Number:

Q968

PANG Baoping, LIU Jiaxiang, ZHOU Xiaorong, ZHANG Ruifeng . Effects of corn cultivar on Tetranychus truncatus Ehara (Acarina:Tetranychidae) population parameters[J]. Chinese Journal of Applied Ecology, 2005, 16(7): 1313-1316.

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