A LABORATORY EVALUATION OF FUNGICIDES FOR USE IN SMOKE GENERATORS

Abstract

Seven fungicides were smoked in electrically operated smoke generators and their deposits were evaluated for toxicity to the germination of spores of Monilinia fructicola. Botran, captan, dodine, dichlone and Phaltan were consistently fungitoxic; sulphur and thiram gave variable results and maneb was non-toxic. Dosage-response curves for smoke deposits of Botran, dichlone, dodine and Phaltan paralleled those of the parent fungicides but the materials differed in efficiency of burning and in proportion of active fungicide deposited. Smoke deposits of Botran, dichlone and dodine were non-phytotoxic to tomato plants at concentrations above their ED50 values, whereas captan and Phaltan were phytotoxic at concentrations below their ED50 values.