12/8/2023 0 Comments Cucumber plant blightChemical Ĭhlorothalonil and mancozeb (maneb) provide fairly good control of target spot when applied on a preventative basis. Surveyed plastic houses at the previous location revealed that the recorded Sclerotinia blight disease incidence was 2.8 and 3.3 for cucumber and pepper plants. No known resistance to target spot is currently available in commercial cultivars. Glasshouse should be decontaminated with a sterilant between crops and good ventilation should be maintained to keep the humidity low during the cropping season. Be certain that fields are scouted thoroughly and that target spot is not misdiagnosed as bacterial spot, early blight, or other foliar diseases. Prevention Non-chemical Īvoid overfertilization, especially with nitrogen, as this leads to a lush growth habit, with more likelihood of significant “melting out”. New chemistries, including the strobilurins and related compounds (e.g., azoxystrobin and famoxadone + cymoxanil), have given excellent control of target spot in University research trials. Treatment Non-chemical ĭestroy crop residues promptly. As lesions develop, large, pitted areas appear on fruit. On fruit, lesions first appear as brown, slightly sunken flecks. Always properly clean your gardening tools throughout the season, too. Provide plants with enough space to breathe and water from below to prevent moisture buildup on the foliage. Symptoms often begin deep within the tomato canopy. Promoting a healthy growing environment is the best way to prevent your plants from picking up this disease. On leaves, the disease first appears as small, necrotic lesions with light-brown centers and dark margins. As the spots enlarge, the entire leaf turns yellow and dies. Ministro F1: Papaya Ringspot Virus, Watermelon Mosaic Virus (Strain 2), Zucchini Yellow Mosaic Virus. Mini-Me F1: Cucumber Mosaic Virus, Downy Mildew, Powdery Mildew. Lesions on leaves begin as small, watersoaked spots delimited by small veins, but soon enlarge to form large, circular, sometimes zonate spots that range from tan to dark brown in color. Marketmore 97 (bred at Cornell): Cucumber Mosaic Virus, Downy Mildew, Powdery Mildew, Scab. The fungal disease is most damaging to cucumber and cantaloupe but may occur on other cucurbits. Prevent cucumber beetles from feeding and infecting plants by covering them with netting or porous fabric.
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