考氏白盾蚧对梨的危害及主要生物学特性观察

 报导了考氏白盾阶pseudaulacaspis cockerelli(Cooley)在云南大理梨园中的发生情况及主要生物学特性,该虫以危害结果枝为主,同时加害于叶片和果实。雌成虫4月上旬开始产卵,平均卵量93粒。在平均气温18～19℃,R.H60～65%的自然条件下卵期为25天。卵化高峰期为5月中旬,6月上旬为若虫涌散盛期。雄虫7月下旬开始羽化,8月上旬进入盛期,寿命仅1～2天。受精雌虫固着在寄主受害部位越冬,已发现的天敌主要是捕食性瓢虫和寄生蜂,梨园管理水平、梨树品种对该虫的发生有一定影响。

Pseudaulacaspis Cockerelli(Cooley)on the Pear and biology

This paper reported Pseudaulacaspis cockerelli on the pear and bionomics in Da Li region of Yunnan province. The old or chards of extensive management were harnled seriously,and appeared one generation a year, Pseadaulacaspis cockerelli overwintered with the fetilized female adults.The egg deposition of hibernated female adults begin during the first ten days of April and average egg laying of female adults was 93 grains,and average egg stage was 25davs(under natural condition 18℃～19℃,RH=60～65%).The prinie hatched nymphae proliferated in the early of June, Its main natural en-emies as ladybag parasitic wasps were collected.