摘要
通过2年的田间调查和小区试验发现:(1)食蚜绒螨与被寄生的棉蚜有翅蚜和无翅蚜在时间—数量分布上具相似性。(2)棉蚜带螨率结果说明,50％有翅蚜可被迁入初期杀死,可使大部分棉蚜繁殖力下降或不能生殖;(3)棉田播种前施肥、浅翻,对食蚜绒螨的发生量不具明显影响;(4)食蚜螨在棉田期其他棉蚜天敌缺少的情况下,填补了此期控蚜天敌时间生态位的空缺,成为棉田生态系统中不可缺少的一员。
Systematic field investigation and data analysis were conducted for two years to analyze the function of the red velvet mite(Allothrombium sp.)against cotton aphid(Aphis gossypii G.), the results showed as follow: (1)The mites and the aphids were synchronous in time and number. The number peak of the mites appears slightly earlier than aphids. The mites can immediately change their distribution similar to the apterius aphids durimg the alatus aphids cut gradually, and with favorable property earlier than aphids, This behavor can ensure the control time to the aphids. (2)the parasiting rate by the mites on the aphids indicated that 50％ of the alatus aphids was killed in the migration time to cotton field, and that reduced reproductive rate or caused the aphids can not reproduction, (3)Before seeding the field, manure and shallow ploughing not apparently af. fected the population of the mites. (4)The investigation of natural enemies of the aphids showed that during young cotton stage under the condition of other enemies of the aphids were in low density, the interval of ecological niche of natural enemies was bridged by the mites, which become one essential member in ecological system of cotton fieds.
出处
《蛛形学报》
1993年第1期41-45,共5页
Acta Arachnologica Sinica
基金
国家自然科学基金
关键词
食蚜绒螨
棉蚜
带螨率
天敌
Allothrombium sp. Cotton aphid Parasiting rate by the mites
