承德柳十八斑叶甲生物学特性初步研究

柳十八斑叶甲(Chrysomela saliciooraxFairm)在河北承德1 a发生2代,以成虫在枯枝落叶层内、土缝或树皮缝内越冬,翌年4月下旬至5月上旬上树危害,至6月下旬出现第一代成虫,7月下旬至8月上旬出现第2代成虫,并在树上危害到10月下旬下树越冬。每年7月上中旬为该虫危害盛期。

A research on biological characteristics of Chrysomela salicioorax Fairm in Chengde

Chrysomela salicioorax Fairm has two generations in a year in Chende.It survives winter in the forest litter,the seam of the soil or the seam of the tree bark.Next year it will harm on the tree during the late April to the beginning of May.The first generation will appear at the late June,and the second generation will appear from the end of July to the beginning of August,and will harm on the tree at late October,and then survive winter.The prime harming season of this insect pest is from the early of July to middle July every year.