Leaves are going red and bronze and some plants wilted suddenly after a spell of rain followed by sun, even though the soil has moisture. Reddening is patchy. Is this a disease or deficiency?
Two different things can look similar here, so separate them. Sudden wilting of whole plants after rain then sun, with the soil still moist, is usually parawilt or sudden wilt, a physiological collapse linked to waterlogging and stress rather than a soil fungus. Drain standing water fast, and a soil drench of a recommended cytokinin or cobalt based product around affected plants, plus light hoeing to aerate roots, often revives them if done early. Patchy leaf reddening, on the other hand, is commonly nitrogen, magnesium or potassium shortage at boll filling, made worse by cold nights, and a foliar nutrient spray such as 2 percent DAP or magnesium sulphate as advised can green it back. If wilting is one sided with browning inside the stem when you split it, that is a true vascular wilt and needs a different plan. Confirm by splitting a few stems and showing a photo to your KVK.
Mine was parawilt last year. The plants that I drained and gave the recovery drench to came back, the ones in the low waterlogged patch died. Drainage is everything in black soil.
For me the reddening was just potash shortage at boll stage. A spray fixed the colour but the wilting type is different, do not confuse the two.
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