Organocide Plant Doctor at 1 teaspoons/8 gal water as a soil drench.No restrictions on reentry when used as a soil drench or media incorporation. MetaStar 2E at 0.25 to 0.5 fl oz/100 gal water as a soil drench at seeding, at 0.5 to 2 fl oz/100 gal water at transplanting, and see label for media incorporation.Mefenoxam 2 AQ at 0.12 to 0.24 fl oz/100 gal water as a soil drench at seeding, at 0.49 to 0.98 fl oz/100 gal water at transplanting, and see label for media incorporation.Do not use copper products within 20 days of treatment and do not use spray adjuvants. Fosphite at 1 to 2 quarts/100 gal water.Banrot 40 WP at 6 to 12 oz/100 gal water.Can also be used as a foliar spray at 26 to 54 fl oz/100 gal water at 14- to 21-day intervals. Alude at 5 to 10 fl oz/100 gal water applied as a soil drench at a rate of 25 gal solution/100 sq ft.Aliette at 1.25 to 4 lb/100 gal water.Rotate fungicides from different groups that have a different mode of action for resistant management. If pots must be reused then wash off all debris and soak in a sanitizing solution or treat with aerated steam for 30 min.Ĭhemical control For bedding plants. Avoid reusing pots or trays from a previous crop for propagation.Check the electrolyte concentration of the medium regularly. Use a low, constant feeding with ammonium fertilizer. Be careful not to bury begonia seed too deeply when planting.Do not overwater, and keep water-hose ends off the ground.Also disinfect any tools and equipment that might be used and contaminate the media. Sterilize soil or media before replanting.Remove and destroy infected plants, increase ventilation, and avoid moistening leaves by watering.Symptoms Stems near ground level of established plants become darkened and water-soaked and collapse. As a rule, these plants tend to be susceptible to overwatering. Excess water and flooding conditions favor the disease as well as cooler soil-media temperatures. Greenhouse Plants, Ornamental - Pythium Seed Rot, Damping-off, and Root RotĬause Pythium ultimum, a fungus-like organism that survives long periods in the soil with a resting structure called an oospore.
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