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梨木虱是我省梨区的重要害虫之一 ,近几年来为害极为严重 ,造成大量落叶和果面污染 ,影响产量和降低果品质量。虽然每年喷药达 1 0次以上 ,仍难以控制为害。为了探索防治梨木虱的新途径 ,于 1 997～ 1 998年组成梨课题组在河北省辛集市的新垒头对其发生规律和防治进行观察和研
Pear lice is one of the important pests in the pear area in our province. In recent years, the damage is extremely serious, resulting in a large number of leaves and fruit surface pollution, affecting yield and reducing fruit quality. Although spraying more than 10 times a year is still difficult to control the damage. In order to explore a new way to prevent and control pear psylla, the composition of pear research group from 1997 to 1998 in Xintiandi, Hebei Province, the new base to observe the rules and prevention and research