摘要
为了明确吡虫啉对白蚁的持效性,研究了室内与野外模拟施工条件下降解半衰期。室内研究发现,在壤土中,吡虫啉初设浓度分别为20、50mg/kg其降解半衰期分别为157.5、198.0d;在砂壤土中,吡虫啉初设浓度分别为20、50mg/kg其降解半衰期分别为187.3、433.1d。同一初设浓度下,吡虫啉在壤土中比在砂壤土中降解得快。在同一种质地土壤中,浓度高者其降解半衰期相应变长。在野外试验中,初设浓度分别为0.05%、0.1%、0.15%,在0～5cm层土壤中吡虫啉的降解半衰期分别为123.8、130.8和133.4d;在5～10cm层分别为216.6、210.0和216.6d。这与建筑物预防15年的要求差距相差甚远。建议实际施工中要注意跟踪补施。
In order to make certain the persistence and efficacy of imidacloprid, its degradation in field and in laboratory was studied. The half-lives of imidacloprid are 157.5d and 198.0d when the begining concentrations are 20mg/kg 187.3d and 433.1d in sand soil. It was showed loam soil than in sand loam soil for the same and 50mg/kg in laom soil in laboratory, while that the degradation of imidacloprid is faster in concentration.The half-lives of imidacloprid are 123.8d, 130.8d and 133.4d in 0-5cm layer in field,while 216.6d, 210.0d and 216.6d in 5-10cm layer, respectively. It is far below the request for 15 years in preventing termite from buildings. The compensatory applieation is requested in practice.
出处
《农药科学与管理》
CAS
2010年第8期29-33,共5页
Pesticide Science and Administration
基金
南京市建设委员会资助项目(2007733)
关键词
吡虫啉
白蚁
降解
持效期
imidacloprid
termite
degradation
persistence and efficacy
