University of Idaho Pest Management Center

Economic thresholds generally do not exist for plant pathogens and nematodes in Idaho field and row crops. The following table instead lists pesticide application timing recommendations for disease and nematode management.

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Pathogen		Pesticide	Timing
	White Mold - Sclerotinia Rot (Sclerotinia sclerotioru)	Fungicides	Apply fungicides if the field has a history of white mold and if rows are expected to close by early bloom; one application when all plants have one open blossom significantly reduces disease and increases yield.

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Pathogen		Pesticide	Timing
	Gray mold (Botrytis cinerea)	Ronilan DF fungicide at 1 lb/A in a minimum of 40 gal/A.	Apply Ronilan DF fungicide first at 10% full bloom and again at 7 to 21 days later.
	Rust (Uromyces appendiculatus)	Sulfur products (325 mesh or finer) containing at least 80% sulfur at 20 to 40 lbs ai/A, depending on plant size.	Apply sulfur products first as soon as lesions or spots appear.
	White Mold - Sclerotinia Rot (Sclerotinia sclerotiorum)	Fungicides	In fields with a history of white mold, apply fungicides when 1% to 10% of the plants have at least one open bloom; a second application may be necessary when disease

References: Pacific Northwest Disease Control Handbook, 2000.

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