Powdery mildew can be controlled with a multi-pronged approach involving plant selection, environmental control and the use of fungicides. 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). Accessibility Accommodation. If allowed to progress, the fungus will penetrate to the stem where stem rot occurs. | Columbus, Ohio 43210. It was reported in Europe in 1843, but not known in the U.S. until 1875. But most powdery mildew can be avoided or cured with inexpensive, homemade remedies that have been proven to work as well as or better than commercial fungicides. Downy mildew can affect lettuce at any stage of growth. Able to occur at a broad temperature range of 41-86 degrees Fahrenheit (5 to 30 degrees Celsius). Watch lettuce crops carefully for any sign of the fungus and treat or remove plants immediately. It has serious implications in commercial growing because the disease spreads easily in certain environmental conditions. It stems from the fungus Bremia lactucae. Powdery mildew is a relatively common fungus that many plants can contract. Conditions favoring development of powdery mildew are: Interestingly, free water on plant surfaces prevents spore germination and infection for powdery mildew. College of Food, Agricultural, and Environmental Sciences Eventually, these become tan to brown and necrotic. Downy mildew in lettuce can affect both the appearance and the yield of a crop. CFAES COVID-19 Resources: Safe and Healthy Buckeyes | COVID-19 Hub | CFAES Calendar. (2007). Lebeda, A. Lettuce Downy Mildew Treatment Control of the disease can be achieved by using resistant strains of lettuce seed. When detected on plants, treat with a fungicide labeled for powdery mildew management on lettuce. One of these is downy mildew. In mature plants that have only recently developed the fungus, the outer leaves can be removed and the head will usually be fine to consume. Powdery mildew on lettuce is favored by warm, dry conditions and occurs primarily on … If you notice it on a few leaves, remove them from the plant and do not compost them (which can still allow the spores to spread). (2011). Koike, S., Gladders, P., & Paulus, A., (Eds.). This powdery mildew can kill the plants. Use lower temperatures, control your relative humidity, do silicate and salicylic acid applications and use beneficial microbes. To prevent powdery mildew from forming in the first place, avoid low-temperature, high-humidity environments. via PublicDomainPictures /pixabay.com. Leaves are discolored and become necrotic, eventually progressing to the stem. It should proceed with pruning the affected leaves, stems, even with the full withdrawal of the plant if you can no longer do anything with it. A second generation of spores is produced within 5 to 7 days. Increased air movement within the plant canopy. Luckily, there are less drastic measures you can take to rid your garden of these pesky fungi. The early symptoms on seedlings are white cottony growth on the young plants followed by stunting and death. A nicely made salad is a perfect start to any meal and usually features fresh lettuce. The Perfect Storm. © 2020 The Ohio State University, College of Food, Agricultural, and Environmental Sciences, College of Food, Agricultural, and Environmental Sciences, Ohio Agricultural Research and Development Center, 2120 Fyffe Road | Room 3 Ag Admin Bldg. Columbus, Ohio 43210 CFAES Diversity | Nondiscrimination notice | Site Map. Fungicides can be used to treat Mildew lettuce, although they should start using the seedbed, and only should always be followed when handling. The fungus also allows outside bacteria to infect the tissue, speeding up the deterioration of the head. Monitor and scout for disease presence regularly, especially in sections of the greenhouse with reduced air flow, dense plant canopies, or standing water. Studies have shown leaf and butterhead lettuce types show more resistance to powdery mildew than romaine and crisphead lettuces. Spores form during the night and are released during the day when humidity is lowered. Powdery mildew is a common summer problem on many types of vegetables and cut flowers. It affects the leaves of the plant, which, unfortunately, is the part we eat. CFAES provides research and related educational programs to clientele on a nondiscriminatory basis. The vegetable is easy to grow, even in the home garden, but certain pests and diseases can wreak havoc on crops. We work with families and children, farmers and businessowners, community leaders and elected officials to build better lives, better businesses and better communities to make Ohio great. It is a fungus that spreads easily in certain weather conditions and can be very hard to control. Powdery mildews are typically host-specific, although plants in the same family can be susceptible to the same mildew species. Many growers struggle with controlling the disease on lettuce crops grown in protected environments, especially during the fall and winter months. Able to occur at a broad temperature range of 41-86 degrees Fahrenheit (5 to 30 degrees Celsius). Disease severity depends upon lettuce type and variety, age and overall condition of the plant, as well as microclimate conditions. Optimal temperature is 64 to 77 degrees Fahrenheit (18 to 25 degrees Celsius). Could occur when the RH is at 50 percent, enabling the disease to develop in both humid and dry environments. The fungus Golovinomyces cichoracearum (formerly Erysiphe cichoracearum) causes powdery mildew on lettuce. Crop losses are common and the spores that cause it can spread over long distances. If possible, choose a time when ambient moisture isn’t at its height. For technical support please contact the CFAES Helpdesk. Powdery mildew produces patches of white powdery growth on the upper and lower leaves and stems. 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The first step in alleviating powdery mildew concerns in lettuce production is to select varieties less susceptible to the pathogen. The spores of the fungi are windborne and can’t be avoided.
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