Co-Authors:
Jones, A.L., Department of Botany and Plant Pathology and the Pesticide Research Center, Michigan State University, East Lansing, MI, 48824, United States
Shabi, E., Department of Plant Pathology, Agriculture Research Organization, The Volcani Center, Bet Dagan, 50-250, Israel
Ehret, G.R., Michigan State University Agricultural Experiment Station Article, 12312, United States
Abstract:
Benzimidazole-susceptible and resistant field isolates of Venturia inaequalis from several areas of the world were compared for sensitivity to the N-phenylcarbamate fungicide isopropyl-N-(3,4-diethoxyphenyl)carbamate (NPC). Sensitive isolates were separated from insensitive isolates on media amended with 0.5/ig/mL NPC. Isolates with very high levels of resistance to benomyl and one isolate from Israel with medium resistance to benomyl were sensitive to NPC. Benomyl-sensitive isolates and isolates with low, medium (from Chile and Maine, USA), and high levels of resistance to benomyl were insensitive to NPC. Examination of 207 representative progeny from 14 crosses between sensitive and insensitive phenotypes indicated that sensitivity to NPC was determined by a single Mendelian gene. Detection of parental but no recombinant phenotypes among these progeny indicate linkage between the gene for sensitivity to NPC and the allele for very high resistance to benomyl. This study substantiates recent reports of negatively correlated cross-resistance to N-phenylcarbamates;n benzimidazole-resistant fungi. © Taylor & Francis Group, LLC.
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