Diazinon, azinphosmethyl, malathion, and methoxychlor malathion, and methoxychlor applied in 3-gal total volume were evaluated for effectiveness against alfalfa weevil (at rates of 0.5, 1, and lib/acre, respectively) were as Hypem postica (Gyllenhal) when applied by aircraft at effective as a methoxychlor (1-lb rate) standard applied various rates and formulations. Undiluted technical for by conventional ground equipment in 20-gal total volume mulations of diazinon (0.59 and 1.06 Ib active/acre) and per acre. Effective adult weevil control was observed in malathion (1.14 and 1.73 Ib actual/acre) gave effective fields treated with 0.38 Ib actual azinphosmethyl applied control when applied late in the spring, azinphosmethyl, undiluted after first harvest.