Authors: Mori, Katsuhiko¹; Nozawa, Mitsuyoshi²; Arai, Kazuya²; Gotoh, Tetsuo³

Source: BioControl, Volume 50, Number 1, February 2005 , pp. 35-51(17)

Publisher: Springer

Abstract:

Stethorus japonicusKamiya (Coleoptera: Coccinellidae) is an indigenous ladybird beetle in Japan, which feeds on many spider mite species. We evaluated the development, survivorship and life-history parameters of this lady beetle on a diet of eggs of the two-spotted spider mite, Tetranychus urticae Koch (red form) (Acari: Tetranychidae). In addition, the effect of short photoperiod on its reproduction was assessed. Survival rates from egg to adult were more than 71% at temperatures between 17.5 and 30 °C. The highest immature mortality was 100% at 35 °C followed by 76% at 15 °C and 52% at 32.5 °C. The lower threshold temperature for development from egg to egg-laying adult was 13.0 °C and the thermal constant was calculated as 238.7° days. Based on these data, the maximum number of generations that could complete development in a year under field conditions in Ibaraki, central Japan, would be between five and seven. The intrinsic rates of natural increase (r_m) were 0.093 at 20 °C, 0.156 at 25 °C and 0.241 at 30 °C. Reproductive diapause was induced at photoperiods with light phases shorter than 13 h at 18 °C.

Keywords: Acari; Coccinellidae; Coleoptera; diapause; intrinsic rate of natural increase; ladybird beetle; lower threshold temperature; predator; spider mite; Stethorus japonicus; Tetranychidae; Tetranychus urticae

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10526-004-5279-y

Affiliations: 1: Research Institute of Japan Plant Protection Association, Ushiku,Ibaraki, 300-1212, Japan, 2: Laboratory of Applied Entomology and Zoology, Faculty of Agriculture, Ibaraki University, Ami,Ibaraki, 300-0393, Japan, 3: Laboratory of Applied Entomology and Zoology, Faculty of Agriculture, Ibaraki University, Ami,Ibaraki, 300-0393, Japan, Email: gotoh@mx.ibaraki.ac.jp

Publication date: 2005-02-01

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• In this Subject: Anatomy & Physiology ,  Zoology ,  Entomology
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