桃树桑白蚧发生规律及生物学特性的研究

对桃树重要害虫桑白蚧的发生规律和生物学特性进行了观察研究。结果表明,桑白蚧在豫北地区1年发生3代,以第三代受精雌成虫在枝条上越冬,至翌年3月树体开始萌动时,吸食树体汁液进行为害,并于4月上旬开始产卵,第一代若虫盛孵期为4月下旬。第二代若虫盛孵期为6月下旬,并开始世代重叠。第三代若虫盛孵期在8月下旬至9月上旬。10月底进入越冬休眠状态。在调查桑白蚧发生规律和生物学特性的同时,还观察记载了桑白蚧的天敌8种,如红点唇瓢虫、异色瓢虫、草蛉和寄生蜂类等。

Study on Occurrence and Biological Characteristics of Pseudaulacaspis pentagona of Peach

Occurrence and biological characteristics of Pseudaulacaspis pentagona,which was an important pest of peach,were observed in the peach orchard in Yuanti village of Xinxiang county from March to the end of October.The results showed that there were altogether three generations of Pseudaulacaspis pentagona in one year in the Central Plains region.And the fertilized female adults of the third generation overwintered on the branches and damaged the trees by sucking the trees'juices in March of the following year when the tree began to sprout.The female adults began to lay eggs in early April.The most richly hatching period of the first generation's nymphs was in the late April and the second generation's nymphs in the late June and then continued generation by generation.The third generation's nymphs were hatched most richly from late August to early September and began to lie dormant throughout the winter in the late October.While investigating the occurrence and biological characteristics of Pseudaulacaspis pentagona,eight kinds of its natural enemies were also observed and recorded,such as the red dot Mulsant,Harmonia axyridis,Chrysopa and Parasitic wasps.