I noticed this about 12 years ago on young oaks in Kilcooley Wood, Bangor Co. Down. This year the mildew on my oak tree is excessive. Hello, Elsa One of the woods I manage has been severely infected but the oaks don’t look too bad. © Copyright 2020 Hearst Communications, Inc. Landscape Notes: Powdery Oak Mildew-- It's Everywhere! Thanks for sharing this awesome post. Thanks. Various live oak species (Quercus spp.) My work at Oxford University, in collaboration with Forest Research and the Centre for Ecology and Hydrology, aims to increase our understanding of the exact climatic conditions that favour oak powdery mildew development. The powdery coating makes it hard for leaves to undergo photosynthesis, which results in discolored, curled, distorted or dead foliage. Thank you. Thank you. Clearing undergrowth is therefore a good idea. They are magnificent trees now perhaps 25 feet high with a fine shape ; I noticed the presence of mildew this summer. Powdery mildew of live oak is a fungal disease that prefers attacking young foliage growing in shady conditions. This suggests an origin for the species in tropical Asia and that somewhere along the line the species “jumped” to grow on oak, as well as mango! Evidence from Europe suggests that, in combination with other stressors including insect pests, oak powdery mildew can have a significant impact on tree growth. The tree has been changing over the past couple of years. Can this be treated? We are testing oak trees grown from seed, sourced from different climatic zones, to see if they are more or less susceptible to disease. Lorna, I have many seedlings in an area that I have deer fenced and many have developed mildew. Powdery mildew fungi generally die in temperatures above 95 degrees Fahrenheit and when exposed to direct sunlight. Reduce your risk of exposure by wearing goggles, waterproof gloves, a face mask, long pants, long sleeves and closed-toe shoes. Glad to hear you have such wonderful oak trees! This year the mildew on my oak tree is excessive. Steve, Hi Steve, They are all under 6ft high and less than 9 years old, grown from acorns. However, it will reduce its growth by coating a large proportion of the tree’s powerhouses – its leaves – with mycelia, thus preventing them from photosynthesising. You’ll notice a whitish “powder” coating the leaves, in some cases causing them to become highly distorted. Treat existing infections by spraying every seven days until disease symptoms go away, then continue spraying every 14 days to prevent the disease from coming back. In the case of the velvet leaves, the fungus invades the surface cells on the maturing leaf, and the interaction of host and fungus cause the velvet growth, and may also cause a bronzing or reddening of the leaf tissues. It will be really helpful. if as you say the 2 types of Mildew are “found to be exactly genetically identical” why have they different Latin names or is that a work in progress? Although not toxic to people or pets, the oil can still cause skin or eye irritation. This tree disease is a biotrophic pathogen meaning it can only grow on living tissue so doesn’t kill the host directly. I welcome your input on this issue and my consideration of freshly crushed garlic administered in a highly diluted aerosol manner. The two fungi were described separately before they were compared using genetic sequencing, hence why they have two different Latin names. I wonder if I can help with your research in anyway and if there are any biological treatments as I’m not particularly inclined to use fungicides. Elsa. We have a very young oak, only about 4m tall, that lives next to a reen (drainage ditch) on the narrow margin of fenland in the southeast corner of wales. I am pleased to report that it has not affected the growth of the trees as they are all now about 20ft tall. I note from your article that it lies in the leaf litter over winter and I wondered if, in addition to clearing the litter, we sprayed the ground with fungicide, but is that a bit extreme?
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