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棉蚜防治指标的研究全国各棉区都正在积极进行,有的已进行3—5年,有的刚刚开始,取得了不少成绩,但也存在一些问题,走过一些弯路。这里仅就研究方法方面作一些小的议论,供同道讨论和参考。一、保持单株定量蚜虫定期为害法保持单株有定量的蚜虫在一定时期内为害,观察所造成的损失。在笼罩中或大田中进行,每处理30株以上,重复3次。以当地主栽品种1—3个,在不同肥力的田块,分苗期、蕾期和花期进行,各期又有5个左右的蚜虫定量。保持单株定量害虫定期为害法,常用于研究生活周期长的害虫的防治指标,行之有效。但
Cotton aphid prevention and control indicators Research Cotton areas are active in the country, and some have been carried out 3-5 years, and some have just begun, and achieved some success, but there are also some problems, some detours. Here are just some small discussion on the research methods for fellow discussion and reference. First, to maintain a single quantitative plant aphids regular damage law to maintain a single plant with a quantitative amount of aphids in a period of damage, observe the resulting loss. In the cage or in the field, each treatment of more than 30, repeated 3 times. 1-3 cultivars were cultivated in fields with different fertility, seedling stage, bud stage and flowering stage, and about 5 aphids were quantified in each stage. To maintain a single plant quantitative pest regularly damage law, commonly used in the study of pests long life cycle control indicators, effective. but