Sunken, oval- to irregular-shaped and reddish brown to black lesions appear on seedling stems. Plants often die as the lesions girdle the stems of cotton seedlings. Superficial fungal growth may be present on the surface of the lesion, from which soil particles often adhere. Infection and lesion development often occur below the soil line, but as the stem grows and elongates, the lesions may be apparent at the soil’s surface.
The symptoms are cause by the soil fungus Rhizoctonia solani, which infects a large number of hots. The mechanical injuries to the seedlings, for example during planting, favor the infection. When lesions occur near the soil line, they may be confused with abrasions to the tissues caused by the wind-driven whipping of the stem against a hard upper soil surface. As seedlings develop, they become naturally resistant to infection as root systems become more extensive and root cells become lignified.
Don’t plant if cold or rainy weather is expected in the next 4 -5 days. Don’t plant deeper than 5 cm.
Always consider an integrated approach with preventive measures together with biological treatments if available. Fungicide combinations such as quintozene and etridiazole, tolclofos-methyl, carboxin or thiabendazole and thiram, carboxin or quintozene and captan significantly increase the percentage of seedling emergence and decrease the disease index in cotton seedlings.
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