It favors wet conditions, much like the conditions experienced last spring throughout most of the Southeast. Gummy stem blight is most commonly found on melon crops. Either Bravo or Dithane could be alternated with. NC-GSB-524W, NC-GSB-527W, NC-GSB-528W, NC-GSB-530W, NC-GSB-531W, and NC-GSB-532W Watermelon Lines with Gummy Stem Blight Resistance and Good Fruit Quality. You don’t spray when the disease starts showing up on the plant because you get behind it pretty quick. In a fungicide experiment, Pristine was the best material for control of gummy stem blight and powdery mildew. Dusts or sprays of fungicides useful for preventing and combating powdery or downy mildew have been shown to be effective against gummy stem blight disease. “It’s a protectant fungicide that needs to be on the plant when weather conditions favor development. The most common method is the use of fungicides as a stem blight treatment. This is a product that has the active ingredient and goes by a number of different trade names (Daconil and Bravo).” Those would be ones that our commercial growers may be able to afford and find in the state,” Sikora said. With the ability to cause lesions on leaves and turn stems into gooey mush, the plant. The pathogen may be carried in or on infested seed. Products like Aprovia Top and Luna Experience are considered good in our Southeast Guide. Gummy stem blight can be a tough foe for watermelon farmers to tackle. The gummy stem blight fungus is both seed- and soil-borne. You can follow a fungicide spray program when conditions favor the disease. “With gummy stem, I don’t believe we have any resistant varieties right now. Protectant fungicides are available for Alabama’s watermelon producers to guard against it, but growers need to be proactive in applying the fungicides and not be reactive, says Ed Sikora, professor and Extension plant pathologist in the Department of Entomology and Plant Pathology at Auburn University. There have been reports of Didymella bryionae having developed resistance to some fungicides in other states.The best defense against gummy stem blight disease is a good offense. Rotation between fungicide classes is very important for fungicide resistance management. There are many fungicides that can be applied. This is very effective when combined with crop rotation. Deeply plow crop residues to reduce inoculum left on plant debris.An important component of fungicide programs are materials which can move. Rotate cucurbit crops for 2-3 years to avoid outbreaks in the field. infection predisposes plants to other diseases, e.g., gummy stem blight.Because the spores move by splashing water, they can reside on any part of the greenhouse structure as well. After removing infected seedlings, disinfect the greenhouse trays, pots, tables, ceiling, etc. There are no products available in Utah that can be applied to seedlings in the greenhouse to control the disease. Sanitation is very important if an outbreak occurs in the greenhouse. Formulations containing the contact fungicides chlorothalonil, mancozeb, maneb, thiophanate-methyl and tebuconazole are effective against the disease.Seedlings can be infected without showing symptoms. Use certified disease-free seed or treat seeds.The fungus can produce fruiting structures on decaying tissue after infection, and the spores move to new leaves and neighboring plants through splashing water. Optimum conditions for infection range from 65-75☏ (depending on the crop) and moisture of up to 10 hours. Seedlings can become infected if the seed is contaminated. The fungus can survive on infected plant debris for up to 2 years in the soil. Disease Cycleĭidymella is seed- and soilborne. On butternut squash, the disease may form distinct concentric rings. On squash fruit, the disease is called Black Rot. Leaf and stem infections are known as Gummy Stem Blight, appearing as necrotic (dead) spots. Transplants provide good seed use efficiency, which is especially important for. The disease affects foliage, stems, and fruit. of resistance, Fungicide resistance, Gummy stem blight, Penthiopyrad. It affects squash, cucumber, melon, and watermelon Labeled for Alternaria leaf spot, anthracnose, downy mildew, gummy stem blight, powdery mildew, Phytophthora blight and. Gummy stem blight is caused by the fungus Didymella bryoniae. Gummy Stem Blight Symptoms on Fruit Casual Agent Gummy Stem Blight on Vine (Clemson University - USDA Cooperative Extension Slide Series, ) Gummy Stem Blight on Foliage (Clemson University - USDA Cooperative Extension Slide Series, )
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