Influence of Benomyl and Methyl 2-Benzimidazolecarbamate on Development ofPenicillium digitatumin the Pericarp of Orange Fruit

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Abstract
Sporulation of P. digitatum on the surface of decaying oranges was inhibited by superficial residues of benomyl and methyl 2-benzimidazolecarbamate (MBC) resulting from postharvest treatments with wax formulations of the fungicides. Benomyl residues prevented emergence of hyphae from the fruit surface during 2 wk of storage at 20.degree. C, whereas MBC primarily inhibited sporulation of the mycelial mat that formed on fruit after treatment. Penetration of the 2 fungicides was investigated by microscopic observations of P. digitatum in sections of the peel (pericarp) of diseased oranges, bioassay of serial sections of peel cylinders from treated oranges for fungistatic activity against P. digitatum, and measurement of the cross-sectional distribution of radioactivity in the peel of fruit treated with 3H-labeled fungicides. All techniques indicated that benomyl penetrated the peel more efficiently than MBC, forming a fungistatic barrier in the flavedo (exocarp) that prevented eruption of the hyphae of P. digitatum through the epidermis.

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