Abstract
Treatments with dicarboximide fungicides provided only 20 to 40% control of grey mould on grape (cv. Moscato d'Asti) in vineyards where benzimidazole and dicarboximide resistant strains ofBotrytis cinerea Pers. constituted about 50% of the fungal population and a high disease pressure existed. The percentage of dicarboximide resistant strains increased after treatment. Fungicide combinations of a benzimidazole with diethofencarb, sprayed twice per season or once alternated with a dicarboximide, provided satisfactory control of grey mould and decreased the percetage of benzimidazole resistant strains. A combination of thiram and procymidone controlled grey mould, but increased dicarboximide resistance in the population.
Samenvatting
Behandeling van druiven (cv. Moscato d'Asti) met dicarboximide fungiciden gaf een onvolledige (20–40%) bestrijding te zien van de grauwe schimmel indien de populatie vanBotrytis cinerea Pers. voor ongeveer 50% bestond uit benzimidazool en dicarboximide resistente stammen en er een hoge ziektedruk heerste. Het percentage dicarboximide resistente stammen nam toe na behandeling. Een voldoende bestrijding werd verkregen met een combinatie van een benzimidazool fungicide en diethofencarb na een tweemalige toepassing of alterneren met een dicarboximide. Het percentage dicarboximide stammen nam hierbij af. Een combinatie van thiram en procymidon werkte afdoende tegen de grauwe schimmel, maar veroorzaakte een stijging van het aantal dicarboximide resistante stammen in de populatie.
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Gullino, M.L., Aloi, C. & Garibaldi, A. Influence of spray schedules on fungicide resistant populations of Botrytis cinerea Pers. on grapevine. Netherlands Journal of Plant Pathology 95 (Suppl 1), 87–94 (1989). https://doi.org/10.1007/BF01974287
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DOI: https://doi.org/10.1007/BF01974287