灰色かび病菌における室内と圃場条件下でのプロサイミドン耐性化の相違

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  • Difference in the potential of Botrytis cinerea to develop resistance to procymidone in vitro and infield.
  • 灰色かび病菌における室内と圃場条件下でのプロサイミドン耐性化の相違〔英文〕
  • ハイイロカビビョウキン ニ オケル シツナイ ト ホジョウ ジョウケンカ デ

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Under laboratory conditions, procymidone-resistant strains of Botrytis cinerea frequently emerged from both the conidia and the mycelia without UV irradiation or the treatment with other mutagenic agents, but no benomyl-resistant strain from the conidia. Contrarily, B. cinerea on rose plants in a greenhouse remained sensitive to procymidone even after spraying the fungicide 19 times during 3 years, but became highly resistant to benomyl after spraying the fungicide only 5 times. Procymidone-resistant strains obtained in vitro were inferior to the parent strain in their ability of sporulation and virulence. Resistant strain R-22 with relatively high virulence had a greatly reduced chance of survival in competition on the plant with the parent strain. The results suggest that procymidone resistance may be accompanied by decreased fitness and virulence, and resistant strains might be retarded or prevented from becoming dominant in the population in the field. Also, it can be concluded that laboratory experiments are quite limited to immediate indication of practical importance of fungicide resistance.

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