20%康福多浓可溶剂在棉叶、土壤上降解动态及棉花上残留量研究

Degradation Dynamic and Residue of Imidacloprid 20 OSL in Cotton and Soil

康福多田间动态试验按棉花棉蚜发生期，以６０ｍｌ／６６７ｍ２ 喷施。在棉叶上原始沉积量为１－９０４ ～２－５８０ｍｇ／ｋｇ，半衰期为２－２ ～２－５ 天；在土壤中原沉积量为０－１０１ ～２－０３７ｍｇ／ｋｇ，半衰期为７－６～１７－７ 天，防治二、三、四代棉铃虫，喷药２～３ 次，３０ｍｌ／６６７ｍ２ 、６０ｍｌ／６６７ｍ２ ，最后一次施药距收获期为１４ 天，在棉籽中残留量低于０－０５ｍｇ／ｋｇ。土壤中残留量低于０－１６５ｍｇ／ｋｇ。结果表明，康福多在棉叶中降解迅速，在常剂量下。

Imidacloprid 20 OSL was applied at 900ml/ha for control of cotton aphids.Its original accumulation was 1.904～2.580mg/kg in cotton leaves and 0.101～2.037mg/kg in soil.Its half-life was 2.2～2.5 d in cotton leaves and 7.6～17.7 d in soil.For control of the 2nd,3rd,4th generation cotton bollworms,sprays of 450ml/ha and 900ml/ha were each made twice or three times,with an interval of 14 days between the last sprays and harvest.Residue was <0.05mg/kg in cotton seeds and <0.165mg/kg in soil.Results indicated that degradation of imidacloprid 20 OSL was rapid in cotton leaves.Normal dosage of imidacloprid 20 OSL brought light contamination to cotton seeds and soil.