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Home → Publications → Seed and Seedling Diseases in the Western US → Evaluation of Fungicides to Control Botrytis Blight in Western Larch Seedbeds at the Coeur D'Alene Nursery, Idaho

Evaluation of Fungicides to Control Botrytis Blight in Western Larch Seedbeds at the Coeur D'Alene Nursery, Idaho

Six fungicides were evaluated to control Botrytis blight of western larch in seedbeds at the Coeur d'Alene Nursery. Fungicides were applied at biweekly intervals during the spring of 1982; test seedlings were inoculated with spores of B. cinerea twice during the evaluation period. Seedling mortality and height were recorded in October just prior to lifting. Because of overall low infection levels, no differences in seedling mortality were apparent as a result of fungicide treatment. Low infection was likely due to drier spring weather than when outbreaks of the disease previously occurred. Most fungicides decreased seedling height, although no external indications of phytotoxicity were apparent. Several of the fungicides tested can be considered for use to control Botrytis blight in larch seedbeds.


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Author(s): USDA Forest Service