Tomato leaf blight8/31/2023 If your tomato plants have late blight you will also notice blackened areas along the stems and the tomatoes develop hard brown lesions. Sometimes a white mold grows along the edges of the brown patches. Leaves may have become wet from condensation dripping from the tunnel roof, leaks in top of irrigation tubing or water depositing on leaves under high humidity. Leaves develop brown patches that turn dry and papery when tomato plants become infected with late blight. Following images taken on 17 June 2019 by Sandy Menasha, Vegetable Specialist Cornell Cooperative Extension of Suffolk County, document that early blight can occur in high tunnel tomatoes. The causal fungus can also cause symptoms on stems and fruit.īelow: Symptoms of early blight on fruit calyx and stem.īelow: One reason tomatoes are grown in high tunnels is to avoid diseases like early blight that are caused by pathogens that need leaves to be wet for several hours in order to infect. Sources of the pathogen are infested seed, debris from infected plants left in or on the soil (where it can survive at least 1 year), and spores from other affected plants dispersed typically short distances by wind, water, insects, or animals.īelow: Early blight symptoms first appear on older leaves near the base of the plant.īelow: Tomato leaves infected with early blight.īelow: Note the ‘target’ appearance of concentric rings. Young seedlings can be killed by stem lesions developing at their base. The disease occurs wherever tomato (and potato, Photos. The causal fungal pathogen also produces symptoms on stems and fruit. Early blight of tomato is a serious disease requiring control measures, including fungicide applications. ![]() Spots first appear on older leaves near the base of the plant. The main symptom of early blight is round leaf spots with a characteristic target appearance due to the dark concentric rings that develop in most spots.
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