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Alternaria leaf spot in cotton

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Infection is favoured by wet weather and temperatures of about 27 o C. Plants are most susceptible at the seedling stage and late in the season when the crop begins to 'cut out'... Infection on cotyledons, leaves and bracts first appears as small, circular brown, grey-brown to tan spots which vary in size from 1-10 mm... Under favourable conditions the disease is most severe on lower leaves and least severe on upper leaves, unless leaves are affected by premature senescence...
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