A Fungicide-Wax Treatment to Suppress Botrytis cinerea and Protect Fresh-Market Tomatoes

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Abstract
The percentage of postharvest decay caused by B. cinerea (Y) and the percentage of B. cinerea decay at harvest (X) was correlated positively (r = 0.87). The equation Y = 2.47577 + 2.36729 X - 0.02944 X2 generated a curve that best fits the data. Apparently healthy mature-green tomato fruits harvested from diseased fields were treated with Botran 75W (DCNA[2,6-dichloro-4-nitroaniline], 3000-30,000 .mu.g AI/ml) in wax. B. cinerea was controlled for 14 days at 20.degree. C when DCNA residues were 3.3 .mu.g/g of fruit or more. Residues of 2.2-4.9 .mu.g provided good protection against infection by conidia of B. cinerea, with higher residues providing better protection. Lesion diameters (X) on fruits inoculated with mycelial plugs of B. cinerea were correlated negatively (r = -0.81) with the amount of DCNA residues (Y). From the regression equation Y = 31.94779-2.91065 X, a residue of 11.0 .mu.g of DCNA < g of fruit should prevent lesion development. Residues of DCNA between 3.3-4.6 .mu.g/g of fruits suppressed the development of established infections, and the number of visible fruit infections was reduced further by higher residues (5.6-12.9 .mu.g).

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