Prevention & Treatment: There is no chemical control for bacterial wilt once plants become infected. Bacterial wilt is most severe on cucumber and cantaloupe and less severe on squash, pumpkin, and watermelon. However, as the disease progresses, more leaves wilt, and eventually, the entire vine is affected. The disease is caused by the bacterium Erwinia tracheiphila, and at first may only affect a few vines on a plant. The main symptom of this disease is severe wilting of the vines, followed by rapid death of the plant. See also Fact Sheet CE-6 Cucurbit Diseases, an Aid to Identification. More information about growing cucurbit plants is available in the fact sheets: HGIC 1304, Cantaloupe & Honeydew Melon HGIC 1309, Cucumber HGIC 1321, Summer Squash and HGIC 1325, Watermelon.
Remove plant debris from the garden after harvest since many diseases survive on plant debris from year to year.
#CUCUMBER BLIGHT FREE#
Keep the garden and surrounding area free of weeds that harbor insects, which can spread viruses and bacterial wilt. Select varieties recommended for South Carolina, especially those with some degree of disease resistance (Table 1). Complete foliar coverage is critically important for the control of these diseases.įor more information on the control of anthracnose and Alternaria leaf blight in cucurbit crops please see the 2020/2021 Mid-Atlantic Commercial Vegetable Production Recommendations Guide.Many diseases of cucurbits can be prevented or minimized in the home vegetable garden by using the following simple cultural controls: Organic growers can apply copper and other labeled products to help suppress development of these diseases. Secondary infections and spread of both diseases can occur during the production season under favorable conditions for disease development.ĭeep plowing debris or the removing of plant debris after harvesting, avoiding overhead irrigation during the production season, and most importantly, choosing cucurbit varieties with resistance are important cultural practices all conventional and organic growers should consider.Īnthracnose and Alternaria are easily controlled with weekly protectant fungicides such as chlorothalonil and mancozeb as long as they are applied prior to the arrival of the pathogen and on a regular basis during favorable disease development. Conidia (spores) develop from dormant mycelium in the soil and are splashed into the canopy causing primary infections during prolonged periods of humid, wet weather causing extended leaf wetness. These symptoms make for easily diagnosing which disease might be present.īoth pathogens can overwinter on infected plant tissue in the soil for 1 to 2 years, thus extended crop rotations are important. Often, black setae (hair-like projections) will develop on the veins of infected tissue. With Anthracnose, spots always develop on veins on the underside of infected leaves. 
With Alternaria, diagnostic concentric black rings will be develop within the spots on infected leaves, often there is a chlorotic (yellow) halo around margins. Holmes)Īnthracnose, caused by Collectotrichum orbiculare, and Alternaria leaf blight (Alternaria cucumerina) produce distinct spots on infected leaves, and in most cases, symptoms begin on the older leaves. Alternaria leaf blight on cantaloupe (NCSU – G.
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