Late Blight Symptoms on Leaves

Initial symptoms on leaves are light- to dark-green water-soaked spots. The spots are circular to irregular in shape. Small lesion viewed from the upper side of leaflet Small lesion viewed from the underside of leaflet Large lesion viewed from the upper side of leaflet Large lesion viewed from the underside of leaflet. A lesion that started in the middle of the leaflet. Late blight lesions are not limited by veins. A lesion with a yellowish halo. When dry weather prevails, lesions dry up and no fungal growth is present on the underside of leaves. When wet weather returns, the fungus resumes growth, again producing mycelium and spores. Dry lesion at the tip of a leaflet surrounded by a light-green halo. Lesions often develop at the tips of leaflets, where dew is retained longest. Brown, dry lesions. A lesion expanding on the leaflet. The white mycelium and spores of the fungus develop at the edge of the lesions, usually on the underside of leaflets. Entire leaves can become blighted as new infections occur and existing lesions coalesce.

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