【摘要】 经10年研究表明:中国梨木虱分泌物与其虫量消长同步;1年有多个高峰,但主峰均出现在每年的6月4～14日,次峰在7月中旬左右;每年发生量和危害与当年气候有关,主要影响因素为相对湿度和降水量,若虫分泌物在旬相对湿度平均60％以上时产生霉菌,使叶片被害,造成早期落叶,果实被污染。更多还原

【Abstract】 A 10 Years’ intensive study shows that the secretion of Pyslla Chnensis is synchronous with the fluctuation of Chinese pear pyslla itself .There are several peaks in a year and the main one usually breaks out from June 4 to June 14 and the deuto occurs during the middle ten days of July. As the key affecting factors are rainfall and relative humidity, the amount and damage of Pyslla Chinese relate to the climate in the year.The secretion of nymphae of Pyslla Chinese will be mildewed on condition that the average relative humidity in the period reaches 60% . Consequently not only are the leaves damaged to defoliation but also the fruies are polluted.更多还原