دراسة استمرارية بقايا مبيدى الدايمثوات و الدلتامثرين على أوراق العنب ضمن الظروف السورية

الملخص EN

A study was conducted in Hama during the summer of 1998 to determine the persistence of the organophosphate dimethoate, and the pyrethroid deltamethrin, on grape leaves in order to calculate the half-life of each and establish the safety period of those two pesticides under the local climatic conditions.

When dimethoate was used at 50 g a.i./100 lit.

water on grape leaves (the recommended rate), the initial deposit was 265.8 mg/kg, and decreased to 1.1 mg/kg after 28 days.

The half-life of dimethoate on grape leaves was calculated to be 3.5 days.

Results of deltamethrin persistence showed that out of 1.25 g a.i./100 lit.

water used on grape leaves, deltamethrin gave an initial deposit of 6.3 mg/kg.

Its half-life was 15.6 days, and the safety period for this pesticide was long (more than one month after spray).