论文部分内容阅读
根据松毛虫幼虫冬季下树越冬的习性,在冬季人为改变其越冬环境,可致死松毛虫。具体方法是:在松毛虫虫口密度较大、危害严重的地块,当十二月下旬或翌年一月中旬气温下降到-25℃以下时,用铁耙将松毛虫翻出暴露在外。树干基部周围的枯枝落叶层、石块、小土坑或土缝等处是越冬松毛虫的天然屏障,经过人工搂树盘后,除少数害虫躲进较深层的土壤里以外,其余大部
Dendrolimus larvae in winter according to the habit of winter overwintering in the winter artificially change their overwintering environment, can kill the pine caterpillar. The specific method is: Moth caterpillar population density, serious damage to the plots, when the temperature in late December or the middle of January the following January fell to below -25 ℃, the iron caterpillar will be pulled out pine caterpillars. The trunk of the trunk around the litter layer, rocks, small soil pit or soil seams and other places is a natural barrier for wintering caterpillars, after artificial hug tree, except for a small number of pests to hide in deeper soil, most of the rest