The powdery mildew that you find on your squash is not the same as the mildew on your beans or roses. When detected on plants, treat with a fungicide labeled for powdery mildew management on lettuce. In the end there are many things you can do to keep your plants free of foliar fungal disease like powdery mildew. It was reported in Europe in 1843, but not known in the U.S. until 1875. Powdery mildew is a common summer problem on many types of vegetables and cut flowers. Disease severity depends upon lettuce type and variety, age and overall condition of the plant, as well as microclimate conditions. This site designed and maintained by CFAES Marketing and Communications. Symptoms of powdery mildew include patches of white powdery growth on the upper and lower leaves and stems, as shown in Figure 1. If allowed to progress, the fungus will penetrate to the stem where stem rot occurs. Control of the disease can be achieved by using resistant strains of lettuce seed. Vegetable and herb crops that are susceptible to powdery mildew are: cucumber, squash, tomato, lettuce, Swiss chard, basil, rosemary, sage, parsley, lemon balm, mints and hypericum. Note that products labeled for control of powdery mildew on ornamentals may not be labeled for use on greenhouse vegetables (e.g., Insignia®). Older plants have the outer leaves affected first. CFAES provides research and related educational programs to clientele on a nondiscriminatory basis. Powdery mildew is a relatively common fungus that many plants can contract. Studies have shown leaf and butterhead lettuce types show more resistance to powdery mildew than romaine and crisphead lettuces. Leaves are discolored and become necrotic, eventually progressing to the stem. Use lower temperatures, control your relative humidity, do silicate and salicylic acid applications and use beneficial microbes. The greenhouse environment provides ideal conditions for development of powdery mildew on lettuce. Restricted air flow. A second generation of spores is produced within 5 to 7 days. Able to occur at a broad temperature range of 41-86 degrees Fahrenheit (5 to 30 degrees Celsius). Many growers struggle with controlling the disease on lettuce crops grown in protected environments, especially during the fall and winter months. CFAES COVID-19 Resources: Safe and Healthy Buckeyes | COVID-19 Hub | CFAES Calendar. Fungicides can be used to treat Mildew lettuce, although they should start using the seedbed, and only should always be followed when handling. Older leaves and mature plants are usually affected first and become chlorotic and deformed, limiting plant growth and marketable yield. It is a fungus that spreads easily in certain weather conditions and can be very hard to control. Treating Powdery Mildew . The vegetable is easy to grow, even in the home garden, but certain pests and diseases can wreak havoc on crops. Optimal temperature is 64 to 77 degrees Fahrenheit (18 to 25 degrees Celsius). | Columbus, Ohio 43210. (2007). Optimal temperature is 64 to 77 degrees Fahrenheit (18 to 25 degrees Celsius). Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Increased air movement within the plant canopy. For more information, visit cfaesdiversity.osu.edu. The early symptoms on seedlings are white cottony growth on the young plants followed by stunting and death. Nutrient film technique troughs have a fixed plant spacing, and scouting efforts should increase when the crop canopy begins to close (leaves from one plant touch those of a neighboring plant). 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Luckily, there are less drastic measures you can take to rid your garden of these pesky fungi. Powdery mildew produces patches of white powdery growth on the upper and lower leaves and stems. Could occur when the RH is at 50 percent, enabling the disease to develop in both humid and dry environments. via PublicDomainPictures /pixabay.com. Lettuce Downy Mildew Treatment Control of the disease can be achieved by using resistant strains of lettuce seed. Preventing the spread and/or severity of powdery mildew is the most cost-effective way of dealing with the fungus. Ideal relative humidity (RH) levels for spore germination.
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