Barati Reihaneh, Hejazi Mir Jalil
Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
Exp Appl Acarol. 2015 Aug;66(4):481-9. doi: 10.1007/s10493-015-9910-7. Epub 2015 Apr 26.
Two-spotted spider mite is a major pest of many agricultural and ornamental crops worldwide. Some reports have indicated that application of neonicotinoid insecticides may lead to increased fecundity of this pest. If this is found to be true, the use of these pesticides may cause an outbreak of spider mite populations. Sublethal effects of three neonicotinoids, namely thiacloprid, acetamiprid and thiamethoxam were studied on T. urticae adults at field recommended doses. The experiments were carried out using bean leaf pieces in plastic Petri dishes. The adult mites were treated using two methods: (1) drench application and (2) spraying of leaves with Potter Spray Tower. Our results indicated that all neonicotinoids tested increased T. urticae population. In both treatment methods, acetamiprid treated mites had the highest intrinsic rate of population increase (rm) and finite rate of population increase (λ); and the lowest mean generation time (T) and doubling time among the treatments. If similar results are obtained from greenhouse and field trials, the use of these insecticides requires necessary precautions such as avoiding repeated use of neonicotinoid insecticide for controlling insect pests.
二斑叶螨是全球许多农作物和观赏植物的主要害虫。一些报告表明，使用新烟碱类杀虫剂可能会导致这种害虫的繁殖力增强。如果这一情况属实，那么使用这些杀虫剂可能会导致叶螨种群爆发。本研究以田间推荐剂量，研究了三种新烟碱类药剂（噻虫啉、啶虫脒和噻虫嗪）对二斑叶螨成虫的亚致死效应。实验在塑料培养皿中使用豆叶进行。成虫螨采用两种方法处理：（1）浇灌施药和（2）用波特喷雾塔对叶片进行喷雾。我们的结果表明，所有测试的新烟碱类药剂均使二斑叶螨种群数量增加。在两种处理方法中，啶虫脒处理的螨具有最高的种群内禀增长率（rm）和种群增长有限速率（λ）；在各处理中平均世代时间（T）和加倍时间最短。如果在温室和田间试验中获得类似结果，那么使用这些杀虫剂时需要采取必要的预防措施，例如避免重复使用新烟碱类杀虫剂来防治害虫。
