Cotton bunchy top: an aphid and graft transmitted cotton disease

A new disease, termed cotton bunchy top (CBT), has been observed in Australian cotton fields since the 1998–99 cotton-growing season. Symptoms included short petioles and internodes, pale, light-green, angular patterns on the leaf margins, and a leathery texture of mature leaves. Affected plants had...

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Bibliographic Details
Published in:Australasian plant pathology 2004-01, Vol.33 (2), p.197-202
Main Authors: Reddall, A., Ali, A., Able, J. A., Stonor, J., Tesoriero, L., Wright, P. R., Rezaian, M. A., Wilson, L. J.
Format: Article
Language:English
Subjects:
Aphididae
Aphis gossypii
Bunchy top
Disease transmission
Leaf area
Leaves
Roots
Seeds
Vectors
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Summary:A new disease, termed cotton bunchy top (CBT), has been observed in Australian cotton fields since the 1998–99 cotton-growing season. Symptoms included short petioles and internodes, pale, light-green, angular patterns on the leaf margins, and a leathery texture of mature leaves. Affected plants had a reduced photosynthetic rate, leaf area, plant height, number of bolls, dry weight of bolls, roots and stem and ultimately yield. CBT was demonstrated to be graft-transmissible in glasshouse experiments. In the field, CBT hotspots appeared to correlate with cotton aphid ( Aphis gossypii ) density and this species was identified as a CBT vector in controlled transmission tests. CBT symptoms and plant responses recorded in graft and aphid-inoculated plants were similar to those seen in the field. Seed transmission of CBT appears unlikely as none of 3930 plants grown from seed of CBT-affected plants developed symptoms. Keywords: integrated pest management, Gossypium hirsutum . Australasian Plant Pathology 33(2) 197 - 202 Full text doi:10.1071/AP03094 © CSIRO 2004
ISSN:0815-3191
0156-0972
1448-6032
DOI:10.1071/AP03094