花生新黑地珠蚧发生程度分级标准研究
China Plant Protection(2015)
Abstract
通过对新黑地珠蚧不同危害程度田块的虫口密度与667 m2产量的关系调查和回归分析表明,虫口密度与667m2产量显著相关.相关方程y(667 m2产量)=533.461 9-0.1071x(虫口密度),r=0.982 7,由回归方程,得出该虫发生轻、偏轻、中度、偏重和重发生5种发生程度的虫口密度分别为250、500、750、1 000头/m2和1 500头/m2.
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