Acute toxity and sublethal effects of pymetrozine on the whitefly parasitoid Encarsia formosa Gahan

Tanja Drobnjaković, D. Marčić
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引用次数: 1

Abstract

Sublethal effects of a pymetrozine-based product (commercial product Chess 50 WP) on life history traits and population growth of one commercialized strain (?Dutch? strain) and two local populations (Bujanovac and Negotin) of the whitefly parasitoid Encarsia formosa Gahan (Hymenoptera: Aphelinidae) were evaluated in laboratory bioassays. All trials were carried out at 27?1?C temperature and under 60?10 % relative humidity and 16/8 h daylight/darkness photoperiod in four replications. Longevity of wasps exposed for 48 h to residues of the pymetrozine insecticide (LC50, 280 mg a.i./l) was shorter (by 2.7-3 days) than that of control wasps. Total parasitism of Negotin wasps was significantly reduced (by 8.2 %), as well as total parasitism and adult emergence of the Dutch strain (by 7.3 and 8.2 %, respectively), compared to control wasps. The instantaneous rate of increase (ri) of surviving adult wasps was also significantly reduced (by 6.6, 6.3 and 7.6 % in populations Negotin, Bujanovac and Dutch strain, respectively). Direct treatment of wasps at their pupal stage (LC50, 300 mg a.i./l) reduced total parasitism of Negotin wasps (by 8 %), and reduced ri levels, but the reduction was significant only for the Bujanovac (by 6.7 %) and Negotin (by 4.6 %) populations. Juvenile development of the parasitoid in treated pupae was significantly extended (by 0.3-1.1 days), compared to control wasps. The implications of these results on integrated control of the greenhouse whitefly are discussed.
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吡蚜酮对台湾白蝇的急性毒性及亚致死效应
吡吡嗪类产品(商品Chess 50 WP)对一株商业化菌株(?Dutch? ?)生活史性状和种群生长的亚致死效应采用室内生物测定法对2个地方寄生性白蝇种群(膜翅目:粉蝇科)进行了评价。所有试验均在27岁时进行。摄氏温度及低于60度?10%的相对湿度和16/8 h的日光/黑暗光周期在四个复制。吡蚜酮杀虫剂(LC50, 280 mg a.i./l)残留处理48 h后,其寿命比对照短2.7 ~ 3天。与对照黄蜂相比,小蜂的总寄生率显著降低(8.2%),荷兰蜂的总寄生率和成虫羽化率也显著降低(分别降低7.3%和8.2%)。成虫的瞬时成虫率(ri)也显著降低(分别在Negotin、Bujanovac和Dutch品系下降了6.6、6.3和7.6%)。在蛹期直接处理(LC50, 300 mg a.i./l)可使小蜂的总寄生率降低8%,ri水平降低,但仅对布雅诺瓦克种群(6.7%)和小蜂种群(4.6%)有显著降低。与对照相比,处理后的寄生蜂幼虫发育明显延长(0.3 ~ 1.1天)。讨论了这些结果对温室粉虱综合防治的意义。
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审稿时长
4 weeks
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