Leaf Spot Control, Maneb, and Ethylenethiourea Residues in Processed Turnip Greens Treated with Maneb

Abstract

Turnip leafy greens were grown in the spring and fall for processing into frozen greens. Maneb+zinc (1.8 or 0.9 kg a.i./ha), benomyl, chlorothalonil, or iprodione were applied weekly until 10 days before greens were harvested. Greens either sprayed with maneb+zinc or not sprayed were processed by washing with water (pH 6.7-6.9), 0.1% detergent (pH 6.7-6.9), or alkaline detergent (pH 9.7-9.9). All fungicide treatments reduced foliage disease induced by Pseudocercosporella capsellae