Cause Mainly Pythium spp. but also Rhizoctonia sp. and Fusarium spp. These soil-infesting fungi or fungus-like microorganisms are widespread and attack young and germinating seedlings of many plants.
Symptoms Seedlings attacked at ground level develop a water-soaked, discolored stem and topple over. Infected plants seldom recover.
- Earliest seedings should go on raised beds in well-drained fields.
- Use a precision seeder so seedlings are evenly spaced and not touching one another.
- Treat seed with fungicide.
- Acquire at 0.7 fl oz/100 lb seed plus a dye. For control of Pythium only. See label for reentry restrictions.
- Allegiance-FL at 0.75 fl oz/100 lb seed plus a dye. To control Pythium spp. only. See label for reentry restrictions.
- Apron XL at 0.085 to 0.64 fl oz/100 lb seed plus a dye. For control of Pythium spp. See label for reentry restrictions.
- Dynasty at 0.1 to 0.38 fl oz/100 lb seed plus a dye. 4-hr reentry.
- Maxim 4FS at 0.08 to 0.16 fl oz/100 lb seed plus a dye. For control of pathogenic Fusarium and Rhizoctonia spp. See label for reentry restrictions.
- Mertect at 0.002 mg a.i./seed plus a dye. To control pathogenic Fusarium spp.
- Spirato 480FS (Group 12) at 0.08 to 0.16 fl oz/100 lb seed plus a dye. 12-hr reentry.
- Thiram 50 WP dyed at 8 oz/100 lb seed (not labeled for Oregon) or 42-S Thiram at 8 fl oz/100 lb seed plus a dye. See label for reentry restrictions.
- Soil applied fungicide.
- Quadris Flowable at 0.4 to 0.8 fl oz/1000 row feet applied in a 7-inch or less band either in-furrow at planting or as a directed spray at cultivation. 4-hr reentry.
- Ridomil Gold SL at 0.51 to 1.3 pints/A may be applied preplant incorporated or as a band after planting where Pythium are a problem. 48-hr reentry.
- Actinovate AG at 3 to 12 oz/A as a soil drench at planting. 1-hr reentry. H O
- Double Nickel LC at 0.5 to 4.5 pints/A for soil application on 14- to 28-day intervals. Can be applied the day of harvest. 4-hr reentry. O
- Prestop at 1.4 to 14 oz/10 gal water (0.1% to 1.0% suspension) as a soil drench or incorporation into growing medium. 0-hr reentry. O
- Regalia (Group P5) at 1 to 2 quarts/A as an in-furrow treatment. 4-hr reentry. O
- Rootshield Home and Garden at 1 to 3 Tbsp/gal water as a soil drench at planting. H O
- SoilGard 12G at 0.5 to 10 lb/A at 4-week intervals will suppress Pythium and Rhizoctonia. See label for specific application types and timings. Can be applied on the day of harvest. O
- T-22 HC at 0.088 to 3.52 lb/100 lb seed (commercial seed treatment) or 4 to 8 oz/100 lb seed (planter box) will suppress certain fungal pathogens including Fusarium, Rhizoctonia, and Pythium spp. Do not use in alkaline soils or if soil is below 50°F. 4-hr reentry. O