Botrytis leaf blight
Crop: Onion Disease: Fungal Pathogen: Botrytis squamosa
Spots often surrounded by slivery-white ‘halo’. Active lesions are grayish-white colour. Small (1 to 5 mm) grayish-white oval shaped lesions. Older lesions tend to be brownish-white and desiccated (dehydrated or dried out). When numerous lesions are present the leaf tips begin to dieback, eventually affecting the entire leaf.
The first symptoms begin as small white spots that are surrounded by a greenish halo. Centers of spots often are tan.
