Development of resistance to thiabendazole in Helminthosporium solani (silver scurf) as a result of potato seed tuber treatment

A - Papers appearing in refereed journals

Hide, G. A. and Hall, S. M. 1993. Development of resistance to thiabendazole in Helminthosporium solani (silver scurf) as a result of potato seed tuber treatment. Plant Pathology. 42 (5), pp. 707-714.

AuthorsHide, G. A. and Hall, S. M.
Abstract

Applying thiabendazole to potato seed tubers affected with silver scurf caused by Helminthosporium solani sensitive to thiabendazole decreased the severity of disease on progeny tubers at harvest, but about 50% of the isolates from these were resistant to the fungicide. The disease was not decreased when samples of the progeny tubers were treated with thiabendazole and planted in the following year, and the incidence of resistant isolates increased. Resistant isolates continued to be present when tubers were planted in the next 2 years without fungicide treatment. Treatment with a mixture of thiabendazole and imazalil also decreased the disease and fewer isolates were resistant than when treated with thiabendazole alone, although the proportion increased after treatment with the mixture in the following year. When seed tubers were infected with thiabendazole-resistant H. solani, silver scurf on progeny tubers was not affected by thiabendazole applied to the seed tubers but was decreased by the mixture of thiabendazole and imazalil. Imazalil was equally effective against H. solani sensitive or resistant to thiabendazole. Some isolates of H. solani had grey aerial mycelium and of 516 of these isolates obtained in 4 years 29% were resistant to the fungicide. Other isolates produced small, black colonies and their frequency increased with thiabendazole treatment of seed tubers. Of 244 of these isolates, 62% were resistant.

KeywordsAgronomy; Plant Sciences
Year of Publication1993
JournalPlant Pathology
Journal citation42 (5), pp. 707-714
Digital Object Identifier (DOI)doi:10.1111/j.1365-3059.1993.tb01556.x
Open accessPublished as non-open access
Funder project or code916
204
ISSN00320862
PublisherWiley

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