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Home → Publications → Tree Planters' Notes → Tree Planters' Notes Volume 64, Number 1 (2021) → Effectiveness of Fungicides and Biopesticides in Controlling Botrytis Gray Mold on Western Hemlock Nursery Stock

Effectiveness of Fungicides and Biopesticides in Controlling Botrytis Gray Mold on Western Hemlock Nursery Stock

Botrytis gray mold is a disease that impacts conifer seedling production and causes postharvest losses during storage. This disease is difficult to control and often persists after common fungicide applications. Many new products exist with the potential to control Botrytis diseases, but little research has been conducted to determine their efficacy on conifers. Through support provided by the Washington State Department of Agriculture Specialty Crop Block Grant, USDA IR-4 Environmental Horticulture programs, and the USDA NIFA McIntire-Stennis program, research was conducted to evaluate the effectiveness of 31 fungicide and biopesticide products to control gray mold caused by Botrytis cinerea on 2-year-old container-grown western hemlock (Tsuga heterophylla [Raf.] Sarg.) seedlings. Although several effective products were identified for controlling gray mold on hemlock seedlings, additional research is needed to determine the optimal application rates and timing of these products to maximize disease control on a broad range of conifer hosts under nursery production conditions.


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Author(s): Gary Chastagner, Marianne Elliott, Joseph M. Hulbert

Publication: Tree Planters' Notes - Volume 64, Number 1 (2021)

Volume: 64

Number: 1