Vegetable Seed Pathology Washington State University

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<strong>Seed</strong>ling blights of onion • Pythium spp., Rhizoctonia spp., Fusarium spp. • Promoted by: • soil drainage – wet, poorly drained, low spots, compaction • crop rotations, including cover crops • decomposing organic matter • Most are NOT seedborne • Spread: • with movement of soil • irrigation water, splashing water, runoff • transplants
<strong>Seed</strong>ling blights of onion • Management: • practices that improve soil drainage • break compaction, drain tiles, raised beds • crop rotation – limited? • incorporate plant residues >8” deep • Fungicide seed treatments/drenches: • soilborne inoculum • limited duration of efficacy • spectrum – Pythium vs. Rhizoc. vs. Fusarium • Fumigants: • metam sodium, chloropicrin, … • Resistance?
Page 1 and 2: Efficacy of Fungicide Seed Treatmen
Page 3 and 4: Pythium damping-off
Page 7: Rhizoctonia seedling blight
Page 11 and 12: Application of a pesticide to a cro
Page 13 and 14: Materials & Methods After seed trea
Page 15 and 16: Health assay: % Seed infected with
Page 17 and 18: Health assay: % Seed infected with
Page 19 and 20: Plant dry weight (grams, 35 d) Pyth
Page 21 and 22: Rhizoctonia assay: Plant dry weight
Page 23 and 24: Summary • Seedborne fungi: • Be

Vegetable Seed Pathology Washington State University

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