吡虫啉防治香蕉黄胸蓟马的减量使用技术研究

为了降低吡虫啉在香蕉果实中的残留风险，探索减量使用方法，在香蕉蓟马防控窗口期，试验比较了70%吡虫啉水分散粒剂(WG)与9种低毒药剂对黄胸蓟马的防效，并进行了该吡虫啉制剂的不同稀释倍数及与不同药剂组合使用对蓟马的防治试验。结果表明：9种对比药剂中，22.4%螺虫乙酯悬浮剂(SC)3 000倍液，20%氟啶虫酰胺SC 2 000倍液和60 g/L乙基多杀菌素SC 1 500倍液的防效最好，达80%以上，与70%吡虫啉WG 3 000倍液的防效差异不显著。70%吡虫啉WG 5 000倍药液的防效为85.7%,与1 500倍药液和3 000倍药液的防效差异不显著，但显著高于7 000倍药液的防效。70%吡虫啉WG的5 000倍液分别与2.5%高效氯氟氰菊酯水乳剂(EW)的1 500倍液、60 g/L乙基多杀菌素SC的1 500倍液、25%噻虫嗪WG的2 000倍液和70%啶虫脒WG的5 000倍液组合使用，4种不同药剂组合处理的防效均达81.4%以上，与施用2次70%吡虫啉WG 5 000倍液的防效差异不显著。通过科学选择替换吡虫啉的药剂，合理使用70%吡虫啉WG的剂量，在香蕉蓟马防控窗口期...

Dosage-reduced technique of imidacloprid for banana thrips (Thrips hawaiiensis Morgan) control

In order to reduce the risk of imidacloprid residues in banana fruits and explore the methods of reducing-usage of imidacloprid, control efficacies of imidacloprid 70% WG against banana thrips (Thrips hawaiiensis Morgan) with nine kinds of low toxicity insecticides were determined and pest control experiment of imidacloprid 70% WG at different dilution ratio and combination with different insecticides were also conducted. The results showed that the control efficacy of spirotetramat 22.4% SC diluting 3 000 times solution, flonicamid 20% SC diluting 2 000 times solution, and 60 g/L spinetoram SC diluting 1 500 times solution was more than 80%, without significant difference from that of imidacloprid 70% WG diluting 3 000 times solution. The control efficacy of imidacloprid 70% WG diluting 5 000 times solution was 85.7%, which was not significantly different from that of diluting 1 500 times and 3 000 times, but significantly higher than that of diluting 7 000 times. Imidacloprid 70% WG diluting 5 000 times solution was combined with lambda-cyhalothrin 2.5% EW diluting 1 500 times solution, spinetoram 60 g/L SC diluting 1 500 times solution, thiamethoxam 25% WG diluting 2 000 times solution and acetamiprid 70% WG diluting 5 000 times solution, respectively. The control efficacy of four different combination treatment was more than 81.4%, which was not significantly different from that of twice application of imidacloprid 70% WG diluting 5 000 times solution. It can effectively control thrips and achieve the goal of reducing the application of imidacloprid in banana field through the scientific selection of insecticides to replace imidacloprid, the proper use of imidacloprid 70% WG dosage and alternate use with other insecticides in the window period of banana thrips control. Our research provides technical support for reducing the residual risk of imidacloprid in banana fruit.