Dynamic Research on Residue of Six Commonly Used Pesticides in Tomato

The degradation dynamics of residue and final residue of bifenthrin,cypermethrin,fenvalerate,chlorothalonil,dimethoate and malathion in tomato were investigated in plastic greenhouse.The results showed that different kinds of pesticide residues in tomato were obviously different.There were fewer organochlorine and pyrethroid pesticides residues in tomato.Four kinds of pesticides had reached the standards of China after spraying with recommended dose and double dose for less than 5 days.Under the condition of double dose,the half-life of chlorothalonil was about 7.70 days,which was the longest.Under the condition of recommended dosage and double dosage,the half-life of dimethoate were 5.22 and 5.89 days,while that of malathion were 3.79 and 4.54 days,respectively.Therefore,we should scientificlly use the pesticides and fully consider the half-life of pesticide to ensure the safety of tomato production