![]() ![]() See Table 1 for examples of products.Įarly Blight: This disease is caused by the fungus Alternaria solani, and is first observed on the plants as small, black lesions, mostly on the older foliage. Begin applications when the disease shows up on leaves and stems or at flowering. Chlorothalonil gives very good control of late blight, and phosphorous acid, mancozeb, or copper fungicide gives good to fair control. Wait 14 days after spraying mancozeb before harvest and 7 days after spraying chlorothalonil before harvest. If the disease is severe enough to warrant chemical control, select one of the following fungicides: chlorothalonil, phosphorus acid, mancozeb, or copper fungicide. Remove diseased plants and tubers of all sizes from the soil and garden area.Do not compost rotten, store-bought potatoes.Destroy volunteer potato and tomato plants, which may harbor the fungus.Other varieties include Elba, Sebago, Rosa, and Allegany. The Irish potato variety Kennebec is resistant to late blight. Purchase “certified disease-free seed potatoes.”. ![]() Allow extra space between the plants and avoid overhead watering, especially late in the day. Locate your garden where it will receive morning sun. Prevention & Treatment: The following guidelines should be followed to minimize late blight problems: A combination of daytime temperatures in the mid-70’s with high humidity is ideal for infection. The fungus produces a foul odor when the infection is severe.įungal spores are spread between plants and gardens by rain and wind. Tubers are symptomless at the initial stages of infection but often develop symptoms in storage. Infected potato tubers have a dry, corky rot that may be brown or reddish. Complete defoliation (browning and shriveling of leaves and stems) can occur within 14 days or less from the first symptoms. These leaf spots will quickly enlarge, and a white mold will appear at the margins of the affected area on the lower surface of the leaves. Young lesions are small and appear as dark, water-soaked spots. Late blight is especially damaging during cool, wet weather. Late Blight: This is a potentially serious disease of potato and tomato, caused by the water mold Phytophthora infestans. Common diseases of Irish potatoes in home gardens are described below. Do not grow potatoes in the same area year after year, but rotate with crops other than tomatoes.įor advice on how to grow potatoes ( Solanum tuberosum), see HGIC 1317, Potato.Remove plant debris from the garden after harvest since many diseases survive on plant debris from year to year.Avoid overhead sprinkler irrigation and keep the leaves dry when watering.Keep the garden and surrounding area free of weeds, which may harbor insects that can spread viruses.Select varieties recommended for South Carolina, especially those with some degree of disease resistance.Saving your own seed potatoes is generally not worthwhile because viruses and other diseases often show up the next year. Always purchase certified disease-free potato tubers.Many diseases of Irish and sweet potatoes can be prevented in the home vegetable garden by using the following cultural controls:
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