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本研究使用专用注射器在香蕉花蕾刚现出时,通过假茎注射吡虫啉防治蓟马。试验1为70%吡虫啉水分散粒剂稀释200、250、300倍液,每株注射40mL;试验2为70%吡虫啉水分散粒剂稀释200倍液,每株注射20、40、60mL。结果表明:试验1和试验2的各处理对香蕉植株均没有药害。试验1中,70%吡虫啉水分散粒剂稀释200倍液对蓟马的防效为82.4%,与常规处理差异不显著,而稀释250、300倍液的防效为75.5%、66.8%,显著低于常规处理。试验2中,70%吡虫啉水分散粒剂200倍液3个注射剂量处理对蓟马的防效分别为77.9%、86.3%、89.6%,注射20mL的防效显著低于注射40mL和60mL的处理。在生产中,利用香蕉假茎注射施用70%吡虫啉水分散粒剂防治蓟马,考虑防效及成本,推荐浓度为稀释200倍液,每株注射40mL。该施药方法节省了农药使用量、施药时间,操作简便,达到了农药减量与确保防效并举的效果,为香蕉生产中减量使用农药提供了技术依据。
In this study, a special syringes were used to control thrips when the banana buds were emerging. Test 1 is 70% imidacloprid water dispersible granules diluted 200,250,300 times, each plant injection 40mL; Test 2 is 70% imidacloprid water dispersible granules diluted 200 times the liquid injection of 20,40,60 mL per plant. The results showed that the treatments 1 and 2 had no phytotoxicity on banana plants. Test 1, 70% imidacloprid water dispersible granules 200 times dilution of the thrips control effect was 82.4%, and the conventional treatment was not significant, and diluted 250,300 times the control effect was 75.5%, 66.8%, significantly Lower than normal processing. Test 2, 70% imidacloprid water dispersible granules 200 times three injection dose control effect on thrips were 77.9%, 86.3%, 89.6%, 20mL injection control effect was significantly lower than the injection of 40mL and 60mL treatment . In the production, the use of banana pseudostem injection of 70% imidacloprid water dispersible granules for the prevention and treatment of thrips, taking into account the effectiveness and cost, the recommended concentration of diluted 200 times the liquid, each injection of 40mL. The application method saves pesticide usage, application time and is simple and convenient, achieves the effect of reducing pesticide dosage and ensuring prevention and control simultaneously, and provides the technical basis for reducing the use of pesticides in banana production.