一、防治时期 各种食心虫都以老熟幼虫,在树冠下的土中做茧越冬。翌年5月下旬到6月上旬左右,土温18℃以上,气温19℃以上,土壤含水量达到10%以上时,幼虫开始出土,15天后为幼虫出土高峰期,此时是防治地下食心虫幼虫的最好时期。幼虫出土高峰期过后约20天左右是成虫和卵的发生高峰期,此时是防治树上食心虫成虫的重要时期。 First, the control period of a variety of food insects are mature larvae, in the soil under the canopy do cocoons wintering. The following year from late May to early June, soil temperature above 18 ℃, the temperature above 19 ℃, the soil moisture reached 10% or more, the larvae began unearthed after 15 days for the larvae unearthed at this time is the prevention and control of underground moth worms larvae The best time About 20 days after the larvae have been excavated, they occur at the peak of adult and egg occurrence, and this is an important period for controlling adult worms in the tree.