methi grown for seed getting white powder on leaves and some plants wilting from base
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White powder on methi leaves is powdery mildew, very common in cool dry weather and worst when the crop is dense and over fed with nitrogen. Plants wilting from the base point to root rot and damping off, made worse by heavy or frequent irrigation. Sow at proper spacing, avoid over irrigation, and treat seed before sowing to cut root rot. Powdery mildew can severely reduce seed set if it comes at flowering, so manage it early. For the seed treatment and any sprays against mildew, follow the label dose, spray interval and pre harvest interval and your local KVK advice, since methi seed is consumed and residues matter.
I cut back the heavy watering and the base wilting reduced a lot. My field used to stay too wet and the plants rotted from the root. Lighter irrigation and better drainage fixed most of it.
Manage the powdery mildew before flowering, if it hits at flowering the seed set drops badly. I keep the rows from getting too thick so air moves and watch the crop in the cool dry spells.
Treat the seed before sowing, that brought my root rot down. And since methi seed goes for eating, I always check the safe spray interval with the KVK so the lot is not rejected for residue later.