![]() Timber rot or White mold (Sclerotinia) can cause serious losses in high tunnel and greenhouse tomato crops that are grown in either natural soil or in bags or pots containing soilless mixes. Stem of tomato plant infected with White mold. Remove and bury any infected plant material from structure. High relative humidity and wet foliage will favor Late blight development. Keep relative humidity in structure below 90%. To help reduce chances for Late blight, keep foliage as dry as possible. Severe infestations can cause the foliage to brown and shrivel. These lesions may enlarge, turning the whole fruit brownish-black. The fungus may also attack immature, green tomato fruit causing dark greasy colored spots with a rough surface. ![]() These spots enlarge during moist weather and may produce white fuzzy growth on the underside of infected leaves. The disease will first appear as greasy-grayish indefinite patches on older leaves and stems. The Late blight fungus can also cause significant losses in tomato plantings. Late blight is the disease historically associated with potatoes and the Irish potato famine of the mid-1800s. Late blight on mature green tomato fruit grown in the greenhouse. Keep foliage dry and use plant and row spacings, which allow for good air circulation. Control of Early blight begins with taking preventative measures. Defoliation caused by Early blight can reduce fruit yield and can leave the fruit open to sunscald injury. Early blight can infect the fruit through the calyx or stem attachment in the immature green or red fruit stage and can produce distinct target-like lesions similar to foliar infection. Severe infestations of this disease can cause 100% defoliation of the plant. Over time, the tissue surrounding the Early blight lesions can yellow and cause the leaves to drop. As these lesions enlarge, a series of dark concentric rings develop in the center of the spot creating a distinct target pattern. On tomato foliage, Early blight first appears as circular irregular black or brown spots on the older leaves of the plant. Early blight causing rot at the stem end of infected tomato fruit.Įarly blight can infect tomato foliage and fruit.
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