Fungicides and the control ofPithomyces chartarum

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Abstract
The increasing use of substituted benzimidazoles as pasture sprays to control the toxic fungus Pithomyces chartarum warranted study of their effects on other members of the mycoflora of herbage. An examination was made of the in vitro effects of thiabendazole, benomyl, and Fuberidazol on fungi frequently recovered from pasture plant leaves, and also on a group of fungi of medical and veterinary interest and some associated with viticulture. Cephalosporium spp., Cladosporium herbarum, Fusarium nivale, Aspergillus amstelodami, Microsporum canis, Trichophyton mentagrophytes, and Bolrytis cinerea were the most sensitive of the fungi examined, being inhibited by 1 ppm of at least two of the three fungicides. Phycomycetes, fermenting yeasts, Colletotrichum graminicola, and Rhyncosporium orthosporum were the least sensitive and were inhibited, if at all, by saturated solutions only. Thiabendazole applied to pasture at a rate of 2 lb/acre, either once or repeatedly, did not reduce the total number of moulds and yeasts recoverable by culture of leaf washings. Proportions of Cephalosporium, which made up a relatively small number of isolates, were reduced, but numbers of pycnidial forms, which were the dominant mould group and which were inhibited by 10 ppm thiabendazole, were unaffected.

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