Tomato Powdery Mildew
Powdery mildew of tomato is emerging as an important disease of greenhouse crops. This pathogen is favored by low light and cool temperatures. In contrast to other fungal plant pathogens, it does not require free water to germinate and cause diseases. DeRuiter’s Seeds has recently released the cultivar Grace which has resistance to powdery mildew.
cupric hydroxide (Kocide 4.5 LF): 1.3 to 2.6 pt/A (0 dh, REI 12h, Group M1). Apply on a 7- to 10-day interval as soon as disease appears or Kocide 2000 DF, 1.5 to 3 lb/A (0 dh, REI 24h, Group M1).
potassium bicarbonate (Armicarb 100, Milstop): 2.5 to 5 lb/100 gal water (0 dh, REI 4h, Group N/A). Apply 10 to 20 gallons of solution per 4350 sq ft. Reapply at 10- to 14-day intervals as needed. Use material within 12 hours of preparation.
potassium salts of fatty acids (M-Pede): 1 to 2% solution (0 dh, REI 12h, Group N/A). Apply at 7- to 14-day intervals (not more than three sprays). See label for precautions. OMRI listed.
For Current information on production methods (including varieties, spacing, seeding, and fertility), weed, disease, and insect management, please visit the New England Vegetable Management Guide website.
Below you will find additional information on managing this crop, including photos of insects and diseases in this crop, fact sheets, articles, and power point presentations, when available.
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