论文部分内容阅读
哈密地区,零星蠖为害榆树,始于一九五八年.四年来,波及全县.每年四月上旬至五月上旬,探食榆树、钻天杨嫩叶,甚者全树大小叶均被蚀尽,钻天杨嫩枝因而干枯.早春地表解冻15—20厘米时,春尺蠖开始出土,三月中旬为羽化盛期,羽化後8—10天开始产卵,四月中旬出现幼虫,一年发生一代.幼虫为害其约18—25天.幼虫能吐丝,一树叶被食尽,乃抽出细丝,虫体倒挂下垂,藉风力飘荡转移他树,继续为害.3—5龄幼虫,抗药性极强,6%可湿性666粉或50%DDT的1-2:100(混合或不混合)喷雾,均无效果.四月下旬至五月上旬,老熟幼虫潜入树根周围及墙边、墙角士中,深15-25厘米处化蛹.
Hami area, sporadic 蠖 damage elm, began in 1958. Four years, spread throughout the county.Early from early April to early May each year, visiting elm, drilling days young leaves, or even the whole tree size leaves were eroded , Drilled days of young twigs and dry.Early surface thawed 15-20 cm, spring 蠖 began unearthed in mid-March for the emergence of feather, 8-10 days after eclosion began to lay eggs, in mid-April there larvae, one generation a year. The larvae damage its about 18-25 days larvae can silk, a tree was exhausted, but extracted filaments, parasites hanging down, by the wind drift his tree, continue to harm .3-5 instar larvae, highly resistant , 6% wettable 666 or 50% DDT sprayed with 1-2: 100 (mixed or non-mixed), no effect from late April to early May, mature larvae sneaked around the tree roots and walls, corner Medium and deep 15-25 cm pupation.