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7 Cards in this Set

  • Front
  • Back
What are the symptoms and signs of vascular wilts?
Sudden wilt and death of plants
Premature yellowing of lower leaves
Vascular discoloration
Viscous ooze in vascular system (for bacterial wilts)
Which species commonly has f.sp.?
Fusarium oxysporum (f. sp. niveum (watermelon)
What causes Dutch elm disease?
Ophiostoma ulmi vectored by European Elm bark beetle
What causes Southern bacterial wilt?
Ralstonia solanacearum
How would you distinguish between the seedling blights caused by Rhizoctonia and Pythium?
Rhizoctonia has thick mycelium with 90 degree angle, septa, and constriction with sclerotia. Pythium has mycelium that is coenocytic with zoospores/sporangia and oospores, oogonia and anteridia
How would you distinguish between a disease caused by Rhizoctonia solani and Sclerotium rolfsii?
Rhizoctonia has thick mycelium with clustered sclerotia. Sclerotium rolfii has ropey mycelium with single sclerotia.
How would you distinguish between vascular wilt caused by Fusarium oxysporum f.sp. niveum and Ralstonia solanacearum?
Fusarium oxysporum would have mycelium, macroconidia, microconidia, chlamydospores. Ralstonia would have oozing and streaming.