草履蚧预测预报与防治指标

Study on forecasting and control threshold of Drosicha corpulenta (Kuwana)

通过对草履蚧 (Drosicha corpulenta (Kuwana) )预测预报和防治指标的研究 ,总结出发生期预测法、危害程度预测法和天敌控制能力预测法等测报技术。得出了平均虫口密度 (x)与平均萌芽率 (y1 )间的关系模型y1 =95 .36 - 39.18x、平均虫口密度 (x)与平均枝枯率 (y2 )间的关系模型 y2 =0 .0 8+2 1.71x、树干表面平均虫口密度 (x)和材积损失率 (y3)间的关系模型 y3=0 .737+2 5 .4 6 x。确定了草履蚧的防治指标为树干表面有虫 0 .16头 / cm2 。

This paper deals with forecasting techniques and control threshold of Drosicha corpulenta (Kuwana),and studies the applications of distance period forecast,damage grade forecast and enemy control capability forecast in the scale.The results show that the regression model of average scale density ( x ) and average budding rate ( y 1 ) is y 1=95.36-39.18x ;the model of average scale density ( x ) and average rate ( y 2 ) is y 2=0.08+21.71x ;the model of average scale density( x ) and timber loss rate ( y 3 ) is y 3=0.737+25.46x .At last,we determine 0.16 scale cm -2 of the control threshold,and put up the grading standard IPM techniques of the scale.