Investigation Of Dissipation Of Fluopyramin Tomato Greenhouse And The Relatedfactors

Fluopyram,one kind of novel benzamide fungicide,with a broad spectrum of herbicide activity.Fluopyram has been widely applied to control fungal diseases in tomato.However,environmental fate of fluopyram are poorly understood in the tomato greenhouse ecosystem.This work aims to investigate fluopyram dissipation dynamics in tomato greenhouse ecosystem and the factors contributed to its degradation.Main contents include:(1)The analytical method for determination of fluopyram and its metabolite residues in soil and tomato;(2)The dissipation dynamics of fluopyram in tomato greenhouse ecosystem;(3)The environmental behavior of fluopyram and identification of its metabolite;(4)Soil microorganism biodegradation of fluopyram.Rsults are as follows.Frstly,a method was developed for simultaneous determination of fluopyram residues in soil and tomato by GC,which can detecte residual of fluopyram in tomato greenhouse samples.The trial of dissipation of fluopyram in the tomato greenhouse ecosystem indicated that fluopyram generally degraded in the tomato greenhouse with the half-life between 4.7-7.9 days.Besides,the trial of environmental behavior indicated fluopyram hydrolyzed hard in water and was difficult to absorb on soil.The experiments of photolysis on soil surface and in water show that fluopyram is photolyzed weakly.In soil,fluopyram degrades by soil microbes.2-(trifluoromethyl)benzamide is the soil microbial degradation product of fluopyram.Eventually,the trial of degradation of fluopyram by microorganisms in tomato greenhouse soil,indicating that strain FJ-1、SD-1 and SD-2 which isolated from Fujian and Shandong soil samples,had degradation ability.The strain FJ-1 had been identified as Paenibacillus sp.,the strain SD-1 and the strain SD-2 has been identified as Bacillus sp..