Research Overview on Occurrence and Control of Tetranychus urticae Koch in China

Tetranychus urticae Koch;Insecticide resistance;Chemical control This paper elaborates the occurrence factors and damage characteristics of Tetranychus urticae Koch in China,and emphatically summarizes three main control strategies of T.urticae,namely agricultural control,chemical control and biological control,as well as research progress in its resistance mechanisms.The problems existing in controlling T.urticae and its resistance management strategies are put forward,to provide a theoretical basis for the resistance management and comprehensive control of T.urticae.

智利小植绥螨防治设施西瓜二斑叶螨的研究与应用

为探明智利小植绥螨(Phytoseiulus persimilis Athias-Henriot)防治设施西瓜二斑叶螨的关键技术和持续控害效果,研究了不同释放时期和释放量条件下智利小植绥螨对西瓜二斑叶螨的防治效果,并持续调查了连续4年释放智利小植绥螨的防治效果。结果表明,释放时期显著影响智利小植绥螨对二斑叶螨的防治效果,二斑叶螨平均数量≤2头/片叶时,释放智利小植绥螨对二斑叶螨的控制效果最好,最大防治效果为82.3%,当二斑叶螨平均数量>50头/片叶时,防治效果较差,不宜释放;释放量也显著影响智利小植绥螨对二斑叶螨的防治效果,按照25头/m^(2)和30头/m^(2)释放智利小植绥螨7、14 d的防治效果均能超过80%,14 d的防治效果显著高于43%联苯肼酯悬浮剂;连续4年定点定棚使用智利小植绥螨防治二斑叶螨,天敌释放量逐年降低,10头/m^(2)释放量即可有效控制二斑叶螨为害,防治效果为89.7%。