![]() It is controlled by crop rotation with non-related crops eg. ![]() Bulb rot occurs if onions are grown in the same field continuously and when the weather is wet. The most common is purple blotch causing purple spots on leaves and leaf curling. To Control apply diemthoate or folimat when insects are noticed on the leaf sheaths.įungal diseases are the most serious. These are thin insects which cause silver spots and withering from the top of the leaves downwards. The most serious pest is the onion thrips.
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