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Common bunt of wheat
Angular leaf spot/ bacterial blight/boll rot/black arm of cotton
Rice tungro virus
Rice grassy stunt virus
Rice ragged stunt virus
Rice yellow dwarf disease
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C/O: Sclerotinia sclerotiorum


Head rot:

  • The fungus infects the back of the head and the tissue becomes soft, light brown and  spongy.
  • This infection extends into the developing head and down the stalk and eventually only the fibrous strands at the back of the head and upper stalk remain.
  • The infected seed at the front of the head eventually falls out of the head due to the sheer weight of the infected seed.
  • Large, black Sclerotia develop below the seed layer and around the seeds.

Sclerotinia head rot of sunflower in the spotlight

Stem rot:

  • sudden wilting of the plant, particularly during grain fill.
  • A light brown, water-soaked area at the stem base will become obvious.
  • The sunflower stem pith is a white cotton-like tissue, which includes mycelial growth within which large, black sclerotia form .
  • Stems often break at this point of infection. Heads do not fill out properly due to nutrients and water not.

Sunflower (Helianthus spp.)-Sclerotinia Wilt and Head Rot | Pacific  Northwest Pest Management Handbooks

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