MGK-264 is a dicarboxamide synergist used to enhance the effects of pesticides.1 It is not lethal to house flies when used at a concentration of 5,000 ppm and induces only 26.4% mortality of two-spotted spider mites when used at a concentration of 1,000 ppm. MGK-264 has synergistic effects on toxicity when used in combination with the insecticide Plictran in susceptible strains of S. littoralis (LD50s = 0.98 and 40 µg/larva with or without MGK-264) and in field strains (LD50s = 0.15 and 1.1 µg/larva with or without MGK-264).2 It also decreases the fecundity of adult L. acuminata and reduces survival of the offspring after hatching when used in combination with sublethal doses of a variety of plant-derived molluscicides.3
1.Kilsheimer, J.A., and Kaufman, H.A.Pesticidal composition comprising a benzothienyl carbamate and synergist(1972) 2.Radwan, H.S.A., Riskallah, M.R., and El-Keie, I.A.Synergistic effects on the toxicity of organotins on cotton leafwormsToxicology14(3)193-198(1979) 3.Singh, K., and Singh, D.K.Effect of different combinations of MGK-264 or piperonyl butoxide with plant-derived molluscicides on snail reproductionArch. Environ. Contam. Toxicol.38(2)182-190(2000)