The fungus can be seed-borne and also survives on crop residue or volunteer plants (maybe in your compost or cull pile?). Scab lesions on fruit are sunken, irregular cavities with corky margins, and may produce a golden brown ooze which dries into brown beads. Bacteria survive on residues as long as it is present, up to two years. Chlorothalonil, mancozeb, or polyoxin D can be used preventively, at the first sign of disease. Chinn also designs marketing materials, holds a Bachelor of Science in psychology and is working toward a PhD in cognitive neuroscience. Angular leaf spot on zucchini, S. Scheufele. Avoid working in gardens or fields while infested plants are wet. Corynespora, also called target leaf spot, is a fungal disease that affects cucumbers and other crops. Pests and insects are a common cucumber disease that can be prevented with physical barriers, insecticides, companion plantings and beneficial insects. They are warm-season annuals and most susceptible to powdery mildew disease. Faster drying reduces excess moisture and fungal development. This site is maintained by Center for Agriculture, Food and the Environment in the College of Natural Sciences. Come high humidity, warm days and nights and rain... powdery mildew typically comes and takes hold on your cucumber, squash and zucchini leaves. Spray cucumber plants with a fungicide if cultural controls are not enough to get rid of the fungus. Resistant cucumber and watermelon varieties are available, but there are no resistant melon varieties. Initial symptoms are small, water-soaked spots that develop on the undersides of leaves. Anthracnose leaf spot, R.L. Gardeners can control this disease through proper plant care and fungicide use. This disease usually occurs in mid-summer and is favored by cool dry days and rainy or dewy nights. It is best to use the spray in the early morning or in the evening. Spores are spread from plant to plant via splashing rain or overhead irrigation. Remove infected plant debris from the garden to prevent the next crop of cucumbers from having the disease. Treatments with Topsin 70 WDG and Topsin 500 SC. Scab, caused by the fungus Cladosporium cucumerinum, can be a significant problem for summer and winter squash, pumpkin, melon, and watermelon. Image 2. There are many fungicides labeled for control of anthracnose; please see the New England Vegetable Management Guide for recommendations. Small, round water-soaked spots appear on leaf tissue, and expand until they are confined by veins, giving them the characteristic angular look. Some fertilizing compounds include both calcium and magnesium. The following should be done: Before planting: 1. Boscalid can be applied up to six times per season with a maximum amount of 3.5 ounces per acre per application. Prevention and treatment of both kinds often involve the same practices. These larger spots (up to a half inch) may exhibit the concentric rings common of Alternaria fungi. Since different fungicides work in different ways and come in a variety of concentrations, it is best to follow manufacturer directions regarding fungicide applications. Leaf spot (Cercospora melongenae) On the leaves appears some small, circular, brown spots surrounded by … Alternaria leaf spot affects all cucurbit crops but is most common on cantaloupe. Anthracnose lesions on watermelon fruit, OMAFRA, Image 3. © Copyright 2020 Hearst Communications, Inc. Leaf spots are small, pale-yellow to white, and again the dead tissue in the center of the lesion may fall out leaving a “shot-hole” appearance. lachrymans. Don’t work in wet fields or work in clean sections of the field first and infected sections last to avoid spreading the disease to unaffected areas or to new plantings. A fungal disease called powdery mildew produces pale-yellow spots on mature cucumber … Clear your garden of weeds, which cucumber beetles also feed on. Practice at least a one year, preferably two or three, rotation away from cucurbit crops. Leaf spotting of either kind is generally similar in appearance and effect. If you catch the disease early, before it is widespread and severe, copper may be effective in reducing its spread. Trellis your cukes and prune excessive foliage periodically for better in air circulation. The fungus survives on crop residue in the soil which persists one to two years. Do not spray when it is too hot, or it may burn your plant’s leaves. Yellowing of the leaf between lesions may occur where disease severity is high. ... OR area, do not irrigate with water draining from another cucumber field. The grey mold on cucumber is produced by the Botrytis cinerea fungus. Of course a diagnosis from a trained pathologist in the lab is ideal, but we understand it is not always possible to test every spot you encounter.
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