Disease Control

NOTES: For the disease control products listed below, one product trade name and formulation is provided for each active ingredient (common name) as an example of rates, preharvest interval (PHI), restricted entry interval (REI), and special instructions. In many cases, there are other products available with the same active ingredient. Please see Table 26 and Fungicides and Bactericides Alphabetically Listed by Trade Name for more information on products with the same active ingredients.

The symbol ^OG indicates a product is listed by the Organic Materials Review Institute (OMRI) as approved for use in organic production. See Organic Certification section for more details.

Leaf Spots and Blights (Alternaria, Ascochyta, Cercospora, Powdery Mildew)

Select resistant cultivars when available. Use cultural practices that minimize periods of leaf wetness such as increased plant spacing, planting in the direction of prevailing winds, and avoiding overhead irrigation. Promptly incorporate plant debris after harvest to speed decomposition.

• azoxystrobin (Quadris F): 6.0 to 15.5 fl oz/A; PHI 0d, REI 4h, Group 11. Applications of Quadris to leafy vegetables may cause phytotoxicity; proceed with caution with regards to tank mixes and adjuvants. Rates vary depending on crop and disease: see label for details. Do not alternate with other Group 11 fungicides.
• Bacillus amyloliquefaciens strain D747 (Convergence): 0.5 to 4.5 pt/A; PHI 0d, REI 4h, Group BM02. Beet only. See label for rates and application methods. 
• copper hydroxide (Kocide 3000): 0.75 to 2.0 lb/A. PHI 0d, REI 24h, Group M01. Beet only. Do not apply in a spray solution having a pH less than 6.5 or tank mix with Aliette.
• cyprodinil plus fludioxonil (Switch 62.5WG): 11.0 to 14.0 fl oz/A, PHI 7d (beet), 0d (Swiss chard), REI 12h, Groups 9 &12. 
• fluopyram (Velum Prime): 6.0 to 6.84 fl oz/acre; PHI 0d, REI 12h, Group 7. Labeled for powdery mildew on Swiss chard only.
• fluopyram plus trifloxystrobin (Luna Sensation): 4.0 to 5.8 fl oz/A; PHI 7d, REI 12h, Groups 7 and 11.
• fluxapyroxad plus pyraclostrobin (Merivon Xemium): 4.0 to 5.5 fl oz/A (beet), 4.0 to 11.0 fl oz/A (Swiss chard); PHI 7d (beet), 1h (Swiss chard), REI 12h. Groups 7 & 11. Use highest labeled rate for Cercospora. 
• laminarim (Vacciplant): 14.0 to 22.0 fl oz/A; PHI 0d, REI 4h, Group P04. See label for application methods and restrictions. 
• penthiopyrad (Fontelis): 16.0 to 30.0 fl oz/A (beet), 14.0 to 24.0 fl oz/A (Swiss chard); PHI 0d (beet), 3d (Swiss chard), REI 12h, Group 7.
• propiconazole (Tilt): 3.0 to 4.0 fl oz/A; PHI 14d, REI 24h, Group 3. Not labeled for powdery mildew on Swiss chard. 
• pydiflumetofen plus fludioxonil (Miravis Prime): 6.8 fl oz/A (beet), 9.2 to 13.4 fl oz/A (chard); PHI 7d (beet), 0d (Swiss chard) REI 12h, Groups 7 &12. 
• pyraclostrobin (Cabrio EG): 8.0 to 12.0 oz/A (beet), 12.0 to 16.0 oz/A (Swiss chard); PHI 0d, REI 12h, Group 11. Do not alternate with other Group 11 fungicides.
• Reynoutria sachalinensis extract (Regalia^OG): 1.0 to 4.0 qt/A (Beet); 0.5 to 4.0 qt/A (chard); PHI 0d, REI 4h, Group P05. Apply to ensure thorough coverage. See label for specific application restrictions and tank mix instructions and rates. 
• Swinglea glutinosa extract (EcoSwing^OG): 1.5 to 2 pts/A; PHI 0d, REI 4h, Group BM01. Beets only. Labeled for Alternaria leaf spot and powdery mildew.
• thyme oil (Guarda): See label for rate; PHI 0h, REI 0h, Group NC. See label for application methods.
• trifloxystrobin (Flint): 2.0 to 3.0 oz/A; PHI 7d, REI 12h, Group 11. Do not alternate with other Group 11 fungicides.

Downy Mildew (Peronospora farinosa f. sp. betae )

More commonly affects spinach but may also infect beets and Swiss chard. Appears as chlorotic patches on the upper surfaces of leaves and fuzzy grayish sporulation on the undersides. Use cultural practices that minimize periods of leaf wetness such as increasing plant spacing, planting in the direction of prevailing winds, and avoiding overhead irrigation. Promptly incorporate plant debris after harvest to speed decomposition. 

• ametoctradin plus dimethomorph (Zampro): 14.0 fl oz/A; PHI 0d, REI 12 h, Groups 45 & 40. Swiss chard only.
• azoxystrobin (Quadris F): 12.0 to 15.5 fl oz/A; PHI 0d, REI 4h, Group 11. Do not alternate with other Group 11 fungicides. Swiss chard only.
• Bacillus amyloliquefaciens Strain F727 (Stargus^OG): 0.5 to 4.0 qt/A; PHI 0d, REI 4h, Group BM02. See label for rates and application methods. Apply preventatively.
• fluopicolide (Presidio 4SC): 3.0 to 4.0 fl oz/A; PHI 2d, REI 12h, Group 43. Must be tank mixed with a fungicide with a different mode of action. Swiss chard only.
• oxathiapiprolin (Orondis Gold 200): 4.8 to 9.6 fl.oz/A; PHI 0d, REI 4h, Group 49. Begin foliar application prior to disease development. Swiss chard only.
• potassium salts of phosphorous acid (Fosphite): 1.0 to 3.0 qt/minimum 20.0 gal/A; PHI 0d, REI 4h, Group P07. Do not apply to plants that are heat- or moisture-stressed. Do not apply directly to plants treated with copper within 20-day interval to avoid plant injury.
• pyraclostrobin (Cabrio EG): 12.0 to 16.0 oz/A; PHI 0d, REI 12h, Group 11. Do not alternate with Quadris or Flint. Swiss chard only.
• Reynoutria sachalinensis extract (Regalia): 0.5 to 4.0 qt/A ; PHI 0d, REI 4h, Group P05. Swiss chard only.
• thyme oil (Guarda): See label for rate; PHI 0h, REI 0h, Group NC. See label for application methods.

Seed Decay

Plant on well-drained soil. Buy treated seeds. Do not use treated seed for food, feed or oil purposes.

• fludioxonil (Maxim 4FS): 0.08 to 0.16 oz/100 lb seed; REI 12h, Group 12. For protection against seedborne and soil-borne fungi. Does not control Pythium and Phytophthora.
• mefenoxam (Apron XL): 0.085 to 0.64 fl oz/100 lb seed; REI 48h, Group 4. For Pythium damping-off protection. Not labeled in ME.
• thiram (Thiram 42 S): 8.0 lb/100 lb seed; REI 24h, Group M03. For use by professional applicators only. Not labeled in VT, NH, or ME.