Xanthomonas citri subsp. malvacearum

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Xanthomonas campestris pv. malvacearum symptoms on cotton leaf (click on image to enlarge it)
Source: Clemson University - USDA Cooperative Extension Slide Series - IPM Images

Xanthomonas citri subsp. malvacearum (ex Smith 1901). Schaad et al. 2006 - (bacterial blight of cotton)
is widespread in many cotton-growing regions. It affects seedlings, leaves, stems (black arm) and bolls (boll rot). Dark brown angular leaf spots develop on the cotton leaves. Warm and humid conditions favor the disease development and losses can reach up to 20-30%.

Xanthomonas campestris pv. malvacearum symptoms on cotton leaf (click on image to enlarge it)
Source: Clemson University - USDA Cooperative Extension Slide Series - IPM Images

Dispersal of the bacterium occurs predominantly through seeds and rain splashes. It can also survive for years on dried leaves. Management relies mainly on the use of resistant cultivars and disease-free seeds.


Synonyms:
Xanthomonas malvacearum
Xanthomonas smithii subsp. smithii
Xanthomonas axonopodis pv. malvacearum
Xanthomonas campestris pv. malvacearum

Vernacular names
• Deutsch: Baumwollbakteriose
• English: bacterial blight of cotton
angular leafspot of cotton
• Español: mancha angular de la hoja del algodonero
• Français: bactériose du cotonnier
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