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Epidemiological and myco floral relationships in cotton gossypium hirsutum seedling disease in mississippi usa


Phytopathology 72(7): 868-872
Epidemiological and myco floral relationships in cotton gossypium hirsutum seedling disease in mississippi usa
Cotton seedlings and soil adjacent to seedlings were collected from various locations in Mississippi. Seedlings were evaluated for incidence of fungi on root and hypocotyl tissues. Selected seedling, fungal and soil variables were analyzed for possible correlations. Of more than 50 different fungi isolated from seedlings, Fusarium oxysporum was the most frequent, followed by Rhizoctonia solani, Thielaviopsis basicola, F. equiseti, and F. solani. Most fungi were isolated more frequently from young than old root and hypocotyl tissues. In pathogenicity tests, isolates of F. oxysporum, R. solani and T. basicola were pathogenic to seedlings. Incidence of F. oxysporum on seedlings was positively correlated with root disease index, hypocotyl disease index, and total soil N/ha and negatively correlated with soil pH. Incidence of T. basicola on seedlings was positively correlated with soil pH, root disease index, and hypocotyl disease index and negatively correlated with seedling population. Incidence of R. solani on seedlings was positively correlated with hypocotyl disease index. Root disease index was positively correlated with hypocotyl disease index and negatively correlated with seedling population.


Accession: 005375055



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