石河子地区梨冠网蝽主要生物学特性及其田间种群消长规律

【目的】研究石河子地区梨冠网蝽的主要生物学特性及其种群田间消长规律,为科学防治提供依据。【方法】室内饲养观察拍照形态特征,定点系统调查田间梨冠网蝽种群消长规律。【结果】4月中旬梨树的发芽时,梨冠网蝽越冬成虫始见于梨树幼叶上,5月底第1代若虫出现,若虫群居为害,受食物限制,成虫转移为害,6月以后世代重叠,7月底至8月为为害高峰期,10月下旬成虫开始寻找越冬场所进行越冬(二、三代田间种群高峰期)。【结论】石河子地区梨冠网蝽一年发生4代,越冬代成虫和第一代若虫是防治梨冠网蝽的关键时期。

Research on the Biological Characteristics of Stephanitis naski in Shihezi City

【Objective】 The aim of this project is to study the main biological characteristics and occurrence regularity of Stephanotis nashi in Shihezi in the hope of providing basis for scientific prevention and control.【Method】Fixed-point and systematical investigation was carried out to determine the biological characteristics and occurrence regularity by indoor feeding of the insects, observation and photography of their morphological features. 【Result】Four generations of S. nashi could be found in Shihezi area: overwinter adults emerged in mid-April on pear trees when leaves began to germinate, and the first generation of nymphs appeared in late May. And when they were living in large groups, they would consume a lot of food, so the fourth and fifth nymphs alternated leaves to feeding. After June the generations overlapped, the hazard summit period was from the end of July to August. In late October, adults began to look for winter sites for overwintering (second and third generation field population fastigium).【Conclusion】The occurrence regularity of S. nashi in Shihezi was clarified: four generations in one year's time. The periods to control overwinter adults and the first generation nymphs were crucial to the controlling work.