Suckflies, are mainly pests of tobacco as noted by Brown (1950) and Gilmore (1949, 1950), but are often detrimental to tomatoes as noted by Jones (1933) and Clark (1934), who obtained control with dusting sulfur. Gilmore's work (1949, 1950) with the suckfly on tobacco showed that one quarter pound of parathion, 1 pint of 10% tetraethyl pyrophosphate solution in 100 gallons of water at the rate of 80 gallons per acre, and 12 to 15 pounds of a 20% toxaphene dust were effective, but only for a few days. Wene (1949) found that dusts containing DDT-sulphur chlordane, methoxychlor, lindane, toxaphene or parathion were effective in controlling suckflies on tomatoes in the Lower Rio Grande Valley of Texas. The object of the present study was to compare 16 of the more recently developed insecticides for control of the tomato suckfly, Crytopeltis notatus (Distant), attacking tomatoes.