Persistence of premix profenofos and cypermethrin in cauliflower Banshtu Tanuja*, Patyal Surender Kumar Department of Entomology, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan-173230 *Email: twinkle_banshtu5@yahoo.in
Online published on 4 January, 2018. Abstract Persistence of profenofos and cypermethrin was studied on cauliflower after application of their individual as well as ready-mix formulations. Profenofos and cypermethrin were applied at recommended rate 400 g and 40 g a.i./ha and at double the recommended rate 800 g and 80 g a.i./ha. Profenofos and cypermethrin residues in curds reached below the limit of determination in 10 and 5 days when applied at recommended rate and in 15 and 7 days when applied at double the recommended rate. Profenofos deposits in ready-mix formulation treatment, reduced to half in 1.73–2.13 days and cypermethrin deposits required 0.91–1.37 days to reduce to half but when applied individually, profenofos initial deposits were reduced to their half in 1.78–2.21 days and cypermethrin deposits became half in 1.06–1.42 days. In soil, residues of profenofos persisted up to 10 days, whereas residues of cypermethrin were below detectable limit in 10th day sampling in individual insecticides. Therefore, safe waiting period of one day is suggested for ready-mix as well as for individual insecticides at recommended and double the recommended rate on cauliflower curds. Top Keywords Persistence, profenofos, cypermethrin, cauliflower, residues, ready-mix formulation, curds, safe waiting period. Top |