Cause Mainly the fungus-like microorganism, P. ultimum (syn. Globisporangium ultimum), but also the fungi, Rhizoctonia sp. and Fusarium spp. These soilborne 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.
Cultural control
- 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.
Chemical control
- Treat seed with fungicide.
- Acquire (Group 4) at 0.7 fl oz/100 lb seed plus a dye. For control of Globisporangium spp. 24-hr reentry
- Allegiance-FL (Group 4) at 0.75 fl oz/100 lb seed plus a dye. To control Globisporangium spp. See label for reentry restrictions.
- Apron XL (Group 4) at 0.085 to 0.64 fl oz/100 lb seed plus a dye. For control of Globisporangium spp. See label for reentry restrictions.
- Dynasty (Group 11) at 0.1 to 0.38 fl oz/100 lb seed plus a dye. 4-hr reentry.
- Maxim 4FS (Group 12) 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 340-F (Group 1) at 0.002 mg ai/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.
- 42-S Thiram (Group M3) at 8 fl oz/100 lb seed plus a dye. See label for reentry restrictions.
- Soil applied fungicide.
- Quadris Flowable (Group 11) at 0.4 to 0.8 fl oz/1,000 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.
- Regalia Fungicide (Group P5) at 1 to 4 quarts/A on 7- to 10-day intervals. Does not benefit from the addition of an adjuvant. Preharvest interval is 0 days. 4-hr reentry. O
Biological control
- Actinovate AG at 3 to 12 oz/A as a soil drench at planting. 4-hr reentry. O
- Double Nickel LC at 1 to 2 quarts/A as a banded soil spray or drench 4- to 6-week intervals or at 0.5 to 4.5 pints/A on 2- to 4-week intervals. Can be applied the day of harvest. 4-hr reentry. O
- SoilGard at 2 to 10 lb/A at 4-week intervals will suppress Globisporangium and Rhizoctonia. See label for specific application types and timings. 4-hr reentry. O
- Stargus at 6 to 8 fl oz per 1,000 ft row as an in-furrow treatment, 3 to 4 quarts/A as a soil drench on 10- to 14-day intervals, or 3 to 4 quarts/A as a chemigation drip treatment on 14- to 21-day intervals. Preharvest interval is 0 days. 4-hr reentry. O