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《Pesticide Science and Administration》 1999-01
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A Evaluation Method of Field Trial for Controlling of Ballworm by 20% Methamidophos with Fenvalerate EC

Xu Liriu(Shangdong Cotton Research Center, Jinan 250100) Xu Liyao(Jingwei School of Penglai City 265600) Wang Yusheng(Tech. Association of Lingqing City 252600)  
During the field test, we convert the eggs into grown-up bollworms. We Consider the number of damaged cotton terminal buds and damaged cotton buds and bolls before using pesticide, when we calculate the protecting rates of cotton buds and bolls. The result is very close to the reality.
【CateGory Index】: S481.9,S435.622
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