What insecticides can be used on pastures and hayfield. Malathion 57 EC and malathion ULV are labeled and have no grazing or harvest restrictions. Carbaryl, formulated as Sevin 4F, Sevin XLR, Sevin WSP, Carbaryl 4L, and others, is also labeled for pastures. Refer to the carbaryl label for waiting period after treatment before grazing or harvesting. Methyl parathion, marketed by Helena and Griffen, is also labeled for grasshopper control in pastures and has a 15 day restriction on grazing and harvest.
Rangeland is defined as land with predominantly native grasses.
Dimilin disrupts the normal molting process during which young grasshoppers shed their skins. Thus, Dimilin is only effective on immature grasshoppers and does not kill adults. However, Dimilin is rain-fast and can provide residual control of hatching grasshoppers for several weeks. All rights reserved.