WSU Extension

Hortsense

Common Diseases
 
Armillaria root rot 
Botrytis blight (Gray mold) 
Cankers 
Crown gall 
Damping-off 
Dead roots 
Dodder 
Downy mildew 
Dwarf mistletoe 
Galls 
Leaf spots and blights 
Nectria cankers 
Phytophthora root rot 
Powdery mildew 
Pseudomonas bacterial canker 
Root rots 
Rusts 
Sclerotinia white mold 
Sudden oak death 
Tubercularia canker 
Verticillium wilt 
Viruses 



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Caption: Dodder on fuchsia
Photo by: R.S. Byther
  
Common Diseases : Dodder
(revision date: 4/30/2013)


Biology
The parasitic flowering plant dodder (Cuscuta spp.) attacks living plants by entwining them in its slender stems. Dodder is characterized by its tangle of leafless, yellow to orange threadlike stems. The stems encircle host plants and steal nutrients and water from the host via modified roots called haustoria. Dodder growth and development is favored by high temperatures and full sunlight. Tiny white, pink, or yellowish flower clusters appear in June; seeds are produced from midsummer until frost kills the plant. Dodder seeds are gray to brown, irregularly round with a rough surface texture, and similar in density to clover and alfalfa seed, which are favored host plants. Seed may be spread by irrigation water, in manure, or by physical transfer by humans or animals. Dodder seed can remain viable in the soil for 20 years.
Management Options

Non-Chemical Management
  • Plant seed free of dodder.
  • Do not spread manure or hay with dodder in it.
  • Pull and destroy dodder-infested plants before the parasite develops seed.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Dodder on fuchsia
Photo by: R.S. Byther