EFFECT OF REDUCED APPLICATION RATES OF DICOFOL AND PIRIMIPHOS-METHYL ON STRAWBERRIES AND COMMON BEANS ON THEIR RESIDUE CONTENT AND CROP PRODUCTION

Residues of dicofol and pirimiphos-methyl applied at different rates o n strawberry and common beans, respectively, were monitored at differe nt intervals. The rate of crop production of each rate was also studie d. High-performance liquid chromatography was employed to detect both compounds and gas chromatography/mass spectrometry analysis was conduc ted for further confirmation. All tested rates produced residue levels below the respective maximum residue limits (MRL) of dicofol and piri miphos-methyl. The highest two rates of dicofol (185 and 139 g of acti ve ingredient/feddan) and of pirimiphos-methyl (750 and 562 g of activ e ingredient/feddan) produced comparable production rates of strawberr y and common beans, respectively. Dicofol residues were 0.230 and 0.10 5 mg/kg, 1 and 2 weeks, respectively, after the application of the hig hest rate. The highest rate of pirimiphos-methyl produced a residue le vel of 0.399 mg/kg, 1 week after application.