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Zhu Zhanhou (Plant Protection and Quarantine Station of Wanxian City, Chongqing 404000)  
Field investigations and laboratory experiments have shown that Sphaeradema apicaly , a newly occurring predominant pest attacking maize crops in Wanxian City, emerges 1~2 generations a year, its adults overwinter in grasses or in stone crevices and migrate to maize fields in early summer the next year,when air temperature rises to about 20℃ to copulate and lay eggs.The duration of its egg,larva and pupa stages last 8.1,20.1 and 10 days, respectively, for the first generation and 7.4, 18.4 and 9 days for the second generation. The adult stage may last as long as 10 months when water and food are available and as short as 38 days if water and food supply is insufficient. Crop loss results from its leaves being attacked by the larvae of the pest.
【CateGory Index】: Q969.512.4
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