| Abstrakt: |
Isolates of Botrytis cinerea resistant to benzimidazoles (BenR), dicarboximides (DicR), or both (BenR DicR) were found on table grapes in vineyards in Israel. In vineyards treated for one or two seasons with benomyl and dicarboximides, 41 % of the isolates were benomyl-resistant, 18 % were dicarboximide-resistant and 21 % were resistant to both fungicides. The frequency of resistant strains was very low in non-treated vineyards. Negatively correlated cross resistance (NCCR) was manifested by 46 BenR isolates which were sensitive to isopropyl N-(3,4-diethoxyphenyl) carbamate (NPC) and 73 benomyl- sensitive (BenS) isolates which were insensitive to NPC; NCCR was not influenced by sensitivity to dicarboximides. A mixture of BenS DicR plus BenR DicS isolates, inoculated on rose petals, was inhibited by mixtures of benzimidazoles plus NPC but not by benomyl, NPC or iprodione alone. Grey mould, incited on maturing grape berries by a vineyard population composed of BenS and BenR strains, was not controlled by benomyl, while the mixture of NPC plus carbendazim was effective. [ABSTRACT FROM AUTHOR] |
Plný text