|Mint Root Borer - Lorsban|
Persistence and Movement
of Chlorpyrifos in Sprinkler - Irrigated Soilč
Sprinkler irrigation (2 ha - cm of water) immediately
after insecticide treatment reduced the dissipation rate of chlorpyrifos compared with
delayed irrigation or no irrigation. Chemical persistence was least in non-irrigated
plots. Chlorpyrifos dissipation rates were rapid during the 2 weeks after treatment.
Thereafter, chlorpyrifos dissipation proceeded more slowly in all plots but relative rates
were greater in non-irrigated plots. Vertical movement of the insecticide in the soil
after sprinkler irrigation was minimal; greater than 99% of the total chlorpyrifos residue
were found in the top 2.5 - cm layer.