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用久效磷乳剂、聚乙烯醇、水配制成缓释剂,用涂茎方法防治棉蚜等棉花苗期害虫,其效果早已肯定。但由于用聚乙烯醇作为缓释剂胶,配制很不方便,加之涂茎工具未能很好解决,致使涂茎治虫这一措施长期难以大面积推广。为扩大棉田前期隐蔽性施药面积,延长一次施药的有效期,减少天敌杀伤、节省治虫用工,近两年来我们对缓释剂配方和涂茎工具进行了研究改进。现将试验结果报告于后。
With monocrotophos emulsion, polyvinyl alcohol, water formulated as a sustained release agent, with the stem method of cotton seedling prevention and treatment of cotton seedling pests, the effect has long been confirmed. However, due to the use of polyvinyl alcohol as a sustained-release gel, formulation is very inconvenient, combined with stems and insects are not well resolved, resulting in the implementation of stems and insects spraying this measure is difficult to large-scale promotion. In order to expand the concealed application area of cotton fields in the early stage, extend the effective period of one pesticide application, reduce the killing of natural enemies and save the pest and worm labor, we made some improvements in formulation and application of slow release formulations in the past two years. The test results are reported later.