Dahlia Mosaic Virus: A Pictorial Guide to Symptoms and ... · Dahlia mosaic virus (DMV) appears to...
Transcript of Dahlia Mosaic Virus: A Pictorial Guide to Symptoms and ... · Dahlia mosaic virus (DMV) appears to...
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Dahlia Mosaic Virus:
A Pictorial Guide to
Symptoms and DiagnosisPrepared by
Hanu R. Pappu
Department of Plant Pathology
Washington State University
Pullman, WA 99164.
E-mail: [email protected]
Acknowledgements:
Research is supported in part by an endowment
created by the American Dahlia Society.
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Over a dozen viruses are known to infect
dahlia. Dahlia mosaic virus (DMV)
appears to be highly prevalent in dahlias
grown in the US. This pictorial guide
includes some of the symptoms produced
by DMV. Symptoms vary widely from
mild mosaic to severe infections that
result in yellowing and stunting of the
newly emerging foliage or the entire
plant. Other symptoms include chlorotic
spots, veinal chlorosis, vein clearing, leaf
malformation and systemic chlorosis.
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Vein Clearing
Chlorophyll loss following leaf veins
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Chlorosis and Stunting Caused by DMV
Chlorophyll loss combined with severe
stunting of new growth
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Chlorosis and Stunting Caused by DMV
Chlorophyll loss combined with distorted leaf
and petiole
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Chlorosis and Stunting Caused by DMV
Chlorophyll loss combined with distortion of
leaf and petiole
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Chlorosis and Stunting Caused by DMV
Chlorophyll loss combined with twisting of
leaf margin
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Chlorosis and Stunting Caused by DMV
Chlorophyll loss combined with distortion of
leaf and petiole
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Chlorosis and Necrosis Caused by DMV
Chlorophyll loss combined with dark necrotic
lesions on leaf and petiole
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Necrosis Caused by DMV
Chlorophyll loss combined with dark necrotic
lesions on leaf and petiole
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Stunting and Necrosis Caused by DMV
Shortened internodes and leaf distortion
combined with necrotic lesions
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Mosaic Caused by DMV
Chlorophyll loss in a random pattern on leaf
blade
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Mosaic and Stunting Caused by DMV
Random chlorophyll loss combined leaf
distortion
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Mosaic and Stunting Caused by DMV
Random chlorophyll loss combined with
distortion of leaf and petiole
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Ring spots Caused by Impatiens Necrotic
Spot Virus on mature dahlia leaf blade