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松毛虫是我省主要森林害虫之一,近年来每年发生近200万亩,占全省森林害虫发生总面积的35%;防治104万亩,占全省害虫防治面积的41%。每年为防治松毛虫要投入大量人力、物力和财力,但如何检查其防治效果,尚无统一的和切合实际的方法。1984年6月,我们在迁西、抚宁、青龙三县试行了虫情精确度检查与防治效果检查相结合的检查松毛虫防治效果的方法。通过实践,认为此法在大面积的防治效果检查中较为可行,且较客观的反映了防治的实际效果。现将检查方法、调查结果及防治一年来的经济效益介绍如下:
Dendrolimus is one of the major forest pests in our province. In recent years, nearly 2 million mu of pests occur each year, accounting for 35% of the total area of forest pests in the whole province. The prevention and treatment of 104 million mu accounts for 41% of the pest control area in the province. Every year for the control of pine caterpillars to invest a lot of manpower, material and financial resources, but how to check the effect of prevention and control, there is no uniform and realistic approach. In June 1984, we piloted the method of examining the effect of controlling pine caterpillars in the three counties of Qianxi, Funing and Qinglong, combining the examination of pest accuracy with the inspection of the effect of prevention and treatment. Through practice, it is considered that this method is more feasible in the inspection of large-scale prevention and control effects and more objectively reflects the actual effect of prevention and treatment. Now the inspection methods, the results of the investigation and prevention and treatment of the economic benefits over the past year are described below: