Powdery mildew (barley)

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Powdery mildew of barley
Causal agentsBlumeria graminis f. sp. hordei
Hostsbarley
EPPO CodeERYSGH
DistributionWorldwide

Powdery mildew is a fungal disease of barley caused by Blumeria graminis f. sp. hordei. The disease has a worldwide distribution and is most damaging in cool, wet climates. The host range of the form species hordei is restricted to barley and other Hordeum species.[1][2]

Symptoms

At first, powdery

cleistothecia), which are the sexual fruiting bodies of the fungus.[3]

The fungus does not kill the host plant as it requires the hosts' water and nutrients to grow. It settles on foliage and gradually slows the host growth process. Fruits, vegetables and flowers do not reach maturity if they become infected by powdery mildew. Flowers bloom is delayed or aborted. Vegetable and fruit crop yield is significantly lowered or the produce is of reduced quality.[4]

Disease cycle

The fungus overwinters as cleistothecia on straw, and in milder climates, also as mycelium and

Sporulation and spore dispersal are favored by drier conditions. Thus the disease does well under alternating wet and dry conditions. Production of conidia declines markedly as the colony ages. Cleistothecia develop on older leaves as the plant matures. Low temperatures, together with the wetting of the cleistothecia for at least 72 hours, induces the maturations of the ascospores. Ascospores are released following rains, but are relatively sparse in comparison to the condia.[5]

References

  1. ^ Wiese, M.V. (1987). Compendium of wheat diseases. American Phytopathological Society. pp. 124 pp.
    ISBN 0-89054-076-4
    .
  2. ^ Martens, J.W.; W.L. Seaman; T.G. Atkinson (1984). Diseases of field crops in Canada. Canadian Phytopathological Society. pp. 160 pp.
    ISBN 0-9691627-0-7
    .
  3. ^ Jensen, Neal F. (1943). Powdery Mildew of Barley: Studies of Yield Losses and the Inheritance of Disease Resistance. Cornell University.
  4. ^ "How to get rid of powdery mildew on plants". Shiny Plant. 2020-12-29. Retrieved 2021-01-13.
  5. ISBN 978-981-13-9853-7
    .

External links

Extension publications
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