Coffee rust

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Coffee rust Hemileia vastatrix
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A
B
C
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Smuts and Bunts

• Obligate parasites (cereals)
• Replace kernels with spore masses
• Historical famines
• 2 spores teliospores and basidiospores
  (sporidia)

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Ustilago maydiscorn smut (Agrios 583-584)

• Overwinters as teliospores in debris
• Basidiospores produced in spring
• Infect all tissues
• Must fuse to form dikaryon to grow

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Corn smut
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Corn smut Ustilago maydis
http//www.apsnet.org/education/lessonsPlantPath/C
ornSmut/discycleFull.htm
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Ustilago maydis Teliospore Release
200 billion spores per gall!!
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Huitlacoche
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(Data from Stringfield, G. H., and D. H. Bowman,
1942. J. Am. Soc. Agron. 34486-494.)
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Loose Smut of BarleyUstilago nuda Agrios 584-588
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Teliospores germinate forming basidia Dikaryotic
mycelium Infects ovary
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Stinking Smut or Bunt of WheatTilletia spp.
(Agrios 588-593)

• Grow with tip of plant
• Oily smut kernels lead to explosions in combines
• Fishy smell

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Disease cycle of Bunt of Wheat
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Sugarcane smut