黑龙江省二化螟虫口密度与粳稻产量损失关系及经济阈值的研究

文章研究了黑龙江省水稻二化螟虫口密度与水稻产量损失的关系和经济阈值,为指导黑龙江省水稻生产,防治二化螟提供了理论依据。结果表明,在水稻分蘖期,二化螟虫口密度(X)与产量损失率(Y)的回归方程为:Y=2.0536X-4.2161,R2=0.9756;枯心率(X)与产量损失率(Y)的回归方程为:Y=1.7187X-2.7756,R2=0.9704。在水稻孕穗期,虫口密度(X)与产量损失率(Y)的回归方程为:Y=1.1971X-0.5521,R2=0.9646;白穗率(X)与产量损失率(Y)的回归方程为:Y=1.5032X-1.9087,R2=0.9806。在水稻分蘖期,其经济阈值为每100丛水稻有二化螟幼虫90~116头;在水稻孕穗期,其经济阈值为每100丛水稻有二化螟幼虫60~103头。

Relationship between population density and yield loss of japonica rice and economic threshold of rice stem borer, Chilo suppressalis (Walker) in Heilongjiang Province

This paper researched on that the investigates the relationship between population density and yield loss and economic threshold of the rice stem borer,Chilo suppressalis(Walker) in Heilongjiang Province.The results showed that,at tillering stage of rice,the regression equation of population density and yield loss was Y=2.0536X-4.2161,R2=0.9756;the regression equation of dead heart rate and yield loss was Y=1.7187X-2.7756,R2=0.9704.At booting stage of rice,the regression equation of population density and yield loss was Y=1.1971X-0.5521,R2=0.9646;the regression equation of white head and yield loss was Y=1.5032X-1.9087,R2=0.9806.The economic threshold was 90-116/100 clump at tillering stage and 60-103/100 clump at booting stage.