Dong Sa, Qiao Kang, Wang Hongyan, Zhu Yukun, Xia Xiaoming, Wang Kaiyun
Department of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, China.
Pest Manag Sci. 2014 Aug;70(8):1267-73. doi: 10.1002/ps.3690. Epub 2014 Jan 9.
Thiacloprid is a chloronicotinyl insecticide that is quite effective against sucking insects. In this study, when thiacloprid was applied at two different rates (normal rate 15 kg ha(-1) , double rate 30 kg ha(-1) ), the systemic distribution and residue of thiacloprid as well as its control effect against whitefly (Bemisia tabaci) were investigated in greenhouse tomato after soil application.
The results showed that thiacloprid was present in the tomato leaves until day 25, and then its amount was less than 0.005 mg kg(-1) and could not be detected. Thiacloprid residue in the tomato stems basically remained at a stable low level throughout the experimental period. Thiacloprid in soil had half-lives of 11.8 and 12.5 days for the normal treatment and the double treatment respectively. The control efficiency of whiteflies was about 90% from day 1 to day 10. This was followed by a slow decline, but efficiency was still higher than 50% until day 21. In addition, no significant differences were noted in the control effect of thiacloprid on whiteflies between the two different rates.
Soil application of thiacloprid at the normal rate can effectively control whiteflies, with high efficiency and long persistence.
噻虫啉是一种氯代烟碱类杀虫剂，对刺吸式害虫有很好的防治效果。本研究通过土壤施药，以两种不同剂量（常规剂量15 kg ha(-1) 、加倍剂量30 kg ha(-1) ）施用噻虫啉，研究其在温室番茄中的系统分布、残留情况及其对烟粉虱（Bemisia tabaci）的防治效果。
结果表明，噻虫啉在番茄叶片中可存在至第25天，之后其含量低于0.005 mg kg(-1) ，无法检测到。在整个试验期间，噻虫啉在番茄茎中的残留基本保持在较低的稳定水平。正常处理和加倍处理土壤中噻虫啉的半衰期分别为11.8天和12.5天。从第1天到第10天，对烟粉虱的防治效果约为90%。随后防治效果缓慢下降，但直到第21天，防治效果仍高于50%。此外，两种不同剂量的噻虫啉对烟粉虱的防治效果没有显著差异。
常规剂量土壤施用噻虫啉可有效防治烟粉虱，防治效果好且持效期长。
