![]() ![]() If you click on the picture, you can clearly see the tiny black spots all over the leaves. ![]() ![]() This tomato leaf shows classic symptoms of Septoria. We haven’t seen any sign of them yet, but the symptoms and signs will probably start showing up after this warm, moist spell. Septoria Leaf Spot and Early Blight are two extremely common tomato diseases in this area. ![]() As the temperature climbs to 90 or hotter, it takes 12 hours of leaf wetness for infection to occur. At temperatures between 70 and 85, 6-9 hours of continuous leaf wetness will result in infection. The fungicides should be sprayed every 7-10 days when the conditions are right for infection. The best way to prevent the disease is to spray with either a copper-containing fungicide or myclobutanil (Immunox, but not Immunox Plus!). Last year I think we lost half of the grapes to this fungus. This morning I am seeing the first of the green grapes with the spots on them. Last week I saw this leaf with the characteristic lesions. I have already seen some indications of the Black Rot on the grapevines. The two diseases that I will be keeping a lookout for in the Demo Garden are Black Rot on the grapes and Septoria Leaf Spot/Early Blight on the tomatoes. Diseased plant parts can be shredded and composted if "hot composting" techniques are used (pile temperatures should exceed 120° F throughout and piles should be turned two to three times).Since our dry spell was broken last week with some damp weather, followed by quite a bit of rain, and now humidity, we are seeing great weather for disease problems!.This may be helpful where the disease causes severe blighting each year leading to reduced yields. Apply a synthetic fungicide or an organic fungicide (fixed copper) according to label directions, early in the season, when symptoms appear to slow the spread of the disease.Remove infected leaves during the growing season and remove all infected plant parts at the end of the season.Prune off the lowest 3-4 leaf branches once plants are well established and starting to develop fruits.Keep plants well mulched to minimize soil splashing.Monitor transplants carefully for signs of this disease.Provide adequate spacing to increase air circulation and remove all suckers that emerge from the plant base.The disease spores are wind-blown, allowing the disease to spread through a garden or neighborhood.Įarly blight symptoms on fruit Lesions with a yellow halo on foliage A severe early blight infection Management The disease can spread during wet or dry weather but is favored by rainfall and heavy dews. Infected, dead leaves may stick to fruits. When leaves die, fruits become more vulnerable to sunscald.Early blight is typically splashed by rainfall onto lower leaves early in the season. It can also be transmitted on seeds and transplants. The fungus overwinters in soil and on plant debris. This is a very common foliar disease of tomato plants that can result in defoliation and reduced yields.The disease can also move to stems and fruits and produce dark lesions. Individual lesions enlarge and coalesce and can kill entire leaves. The lesions develop a "bulls-eye" pattern of concentric rings that can be seen with a hand lens. A yellow halo usually surrounds the lesions. Infections begin as small brown spots on older leaves that quickly enlarge.Brown spots on leaves at the bottom of tomato plantsĮarly blight - Alternaria linariae (= A. ![]()
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