Leaf blotch of Onion and Leek

The symptoms on onion foliage are conspicuous, large white spots or blotches that measure as 1,5x0, cm. these spots can resemble burn from herbicides or nitrogen fertilizers. These lesions take on a brown or dark brown color as the fungus sporulates on the affected tissue. The foliage collapses as lesion merge; foliage collapse is especially rapid when crops start to senesce. On leek, leaf lesions are large (up to 2,5 x 1,5 cm), elliptical white blotches that turn brown as the fungus sporulates. For both leek and onion, lesions are difficult to distinguish from white tip and purple blotch, which can all occur on the same plant.