Maintenance of Guthion Registrations on Pome Fruit: Fruit Residue Reduction Through Spray Timing Optimization
Author: Allan S. Felsot, Vince Hebert, Doug Walsh
Published: 2002
Summary: This project measured the decline of Guthion (azinphos-methyl) and Sevin (carbaryl) residues in an orchard when applied one, two, or three times during the growing season, measured residues in composited and single-serving fruit samples at harvest, developed an empirical phenological (degree-day) based fruit pesticide residue decline model that predicts the best application timing window to give the lowest possible residue concentration, and validated the fruit pesticide residue decline model by measuring Guthion and Sevin residues in fruit harvested from commercial orchards receiving variable number of applications.
