DDT Residues on Peach in Ontario1
- 31 January 1959
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Economic Entomology
- Vol. 52 (1) , 109-110
- https://doi.org/10.1093/jee/52.1.109
Abstract
In an experiment on Elberta peach a DDT residue approximately 30% below the official tolerance of 7 p.p.m. was left on the fruit at harvest by the spray schedule recommended for control of the oriental fruit moth (Grapholitha molesta (Busck), Olethreutidae: Lepidoptera), namely, 2 pounds of 50% wettable powder per 100 imperial gallons on July 4 and 15 and 1 lb. on August 22, 25 days before harvest. Approximately 4.5 gallons per tree per application were applied. The tolerance was exceeded when three earlier sprays (May 27, June 5 and 17) were added to this schedule. The last spray alone (August 22) left a residue on the fruit at harvest of approximately 25% of the official tolerance permitted.This publication has 1 reference indexed in Scilit:
- Effect of Spray Date on Residues of Chlorinated Hydrocarbon Insecticides on Peaches1Journal of Economic Entomology, 1957