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Transplant Diseases and their Management

Transplant Diseases and their Management. Take Healthy Plants to the Field. More vigorous & tolerant of stress Less likely to cause outbreaks of disease in the field Less likely to get unrelated diseases Black shank Fusarium wilt. Prevention is an important consideration

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Transplant Diseases and their Management

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  1. Transplant Diseasesand their Management

  2. Take Healthy Plants to the Field • More vigorous & tolerant of stress • Less likely to cause outbreaks of disease in the field • Less likely to get unrelated diseases • Black shank • Fusarium wilt

  3. Prevention is an important consideration in managing diseases in a float bed…

  4. How Pathogens Enter the Float System • Air • Water • Contaminated plants, soil, trays, & equipment • People & animals • Insects

  5. Integrated Approach toDisease Management • Pathogen • Sanitation • Fungicides • Environment • Temperature • Moisture • Host • Temperature • Injury • Stress

  6. Sanitation • Clean transplant trays are critical to success • Pythium & Rhizoctonia will carry over in old trays • Key to managing Pythium & target spot (Rhizoctonia) • Keep soil out of bays • Source of pathogens like Pythium and Rhizoctonia • Keep diseased plants out of the float system: • Pythium root rot • Blue mold

  7. Sanitation as a Tool for Disease Management • Control weeds in and around float systems • Keep diseased plants out of your system • Imported tobacco seedlings

  8. Sanitation as a Tool for Disease Management • Finish clean! • Destroy unused transplants as quickly as possible • Clean & store trays • Source of blue mold after transplanting

  9. Promote Rapid Drying of Leaves • Adequate ventilation [side vents, fans] • Proper location of beds & greenhouses • Proper level of water in beds • Manage weeds

  10. Minimize Plant Stress • Maintain proper fertility level • Excess nitrogen favors black leg, blue mold, & collar rot • Nitrogen deficiency favors target spot • Prevent injury to plants • Heat stress • Cold stress

  11. Clipping • Avoid stress & buildup of plant debris • Clip properly – minimize injury & stress • Remove clippings and dispose of them properly • Clean and sanitize equipment after each use

  12. Pythium Root Rot

  13. Management of Pythium Root Rot • Sanitation • Terramaster 4EC • PREVENTIVE: 1 fl oz/100 gal @ 2-3 weeks after seeding (when roots enter water) • 2nd application @ 1 fl oz 3 weeks later • Final applicaton @ 0.8 fl oz 2 weeks after 2nd app. • CURATIVE: 1.4 fl oz/100 gal no sooner than 3 weeks after seeding • 2nd application can be made at 1-1.4 fl oz/100 gal 3 weeks after 1st application

  14. Target spot (Rhizoctonia solani)

  15. Target spot

  16. Rhizoctonia damping-off

  17. Sclerotinia collar rot

  18. Black Leg(Erwinia caratovora)

  19. Management of Leaf and Stem Diseases • Sanitation & exclusion of contaminated plants • Minimize leaf wetness • Clip properly & manage temperatures • Avoid buildup of leaf debris • Maintain proper nitrogen level • 100 ppm for as long as recommended • Fungicides • Preventive or at 1st symptoms • Good coverage is important for good control

  20. Chemicals for Control of Leaf Diseases on Seedlings • Dithane DF • Blue mold, anthracnose, damping-off • 0.5 lb/100 gal of spray water (1 level tsp/gal) • Apply 3-12 gallons per 1000 sq. ft • Continue on a 5-day schedule until transplanting • Aliette WDG • Blue mold only • 0.5 lb/50 gal of spray water (2 level tsp/gal) • AgriMycin-17 (Agricultural streptomycin) • Blackleg / bacterial soft rot (suppression) • 100-200 ppm (1-2 level tsp/gal of spray water)

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