Brief diagnosis via Dr. Bob K. from a Cotton Field in Grady Co:
Cotton Falling Over – Cale Cloud, Grady Co, 2021 
Stem Lesion on Cotton Seedling – Cale Cloud, Grady Co, 2021
“[In pic to left] not only is the cotton ‘falling over’ but is skippy. This becomes a math equation. Cool weather + wet weather + young ‘skippy’ cotton + young cotton ‘falling over = ??’ I know many of you are saying Sore-shin post-emergent seedling disease caused by Rhizoctonia solani where cool wet weather slowed emergence and vigor and increased risk. That’s a good answer, but still a little speculative, as there could be other non-disease reasons.
But Cale nails the diagnosis through the second picture [image on the right] that shows the severe lesion just below the soil line. What is it? Sore-shin post-emergent seedling disease caused by Rhizoctonia solani where cool wet weather slowed emergence and vigor.
What can be done? Nothing now, except determine if the stand is ‘good enough’ or needs re-plant. To reduce risk to seedling disease on cotton in the future: 1) avoid planting when soils are cool and wet, or are likely to be. 2) Use a good fungicide seed treatment. 3). Use an in-furrow product if needed.”