Symptoms mainly affect the leaves. The cotyledons were infected with germinal pinpoint size purple-red spots, expanded to brown, purple edges, slightly elevated round to irregular lesions, multiple lesions fused together to form a large lesion, scattered black small particles in the middle, The conidia of the pathogen. The center of the lesion is easily broken and perforated, and severe leaves fall off. True leaf disease lesions are round, yellow-brown, with purple-red edges.
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Pathogen Phyl10sticta gossypina Ell. et Mart. The spotted cotton leaf spot and P.malkoffii Bubak., Markov leaf spot mold, are all fungi of the subphylum Aspergillus. Both conidia spores were buried in the leaf tissue. The former is spherical yellow-brown, 93.8 μm high, 85.7 μm in diameter, 18 μm in diameter at the top end, and dark brown in color. Conidia are oval to elliptic with 1 oil drop at each end, 4.8-7.9 μm long and 2.4-3.8 μm wide. The Markov leaf spot conidia are elliptic to short cylindrical, 7.04-9.283.63-4.5 (μm) in size, and also have 2 oil spots.
Transmission Pathways and Pathogenic Conditions Both pathogenic bacteria overwintered on diseased bodies with mycelia and conidia. In the following year, a large number of conidia are released from the conidia, and the spores germinate through wind and rain and in high humidity conditions. When the first true leaves of cotton have just grown, they encounter low-temperature rainfall, weak seedling growth, and easy incidence.
See control methods for cotton ring spot disease. 