Do you think it would be worth trying the spray solution onto the leaves? If the oak is 4 m tall then it is probably OK despite the mildew! I welcome your input on this issue and my consideration of freshly crushed garlic administered in a highly diluted aerosol manner. In combination with other emerging plant health problems, including acute oak decline (a mysterious syndrome characterised by stem bleeds and beetle attacks) oaks are increasingly under threat. Evidence from Europe suggests that, in combination with other stressors including insect pests, oak powdery mildew can have a significant impact on tree growth. http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0329.2008.00544.x/full. Reduce your risk of exposure by wearing goggles, waterproof gloves, a face mask, long pants, long sleeves and closed-toe shoes. Can I ask whereabouts in the country you are, and do you know what species of oak they are? Elsa. Is it the same sp.of powdery mildew that effects Dogwood? The tree has been changing over the past couple of years. The pots are now separated by 30cm from each other; is this enough and should they be in the open rather than in a secluded yard area by the house? It is now about 10″ (5 months old). However, scientists recently revealed an unlikely origin for the most common species of oak powdery mildew, Erysiphe alphitoides – found to be exactly genetically identical to Oidium mangiferae, a powdery mildew on mango. I plant acorns each year in pots to eventually give away to the National Forest but this year my 1st and 2nd year trees have powdery mildew on them and even after washing the leaves with water it remains. Powdery Mildew on Oaks. Discard pruning debris in a covered trash can. This was a excellent informative post you have shared on this page about the grow of fig t tree but ,the shade provided by their girth and large leaves is well-appreciated. You’ll notice a whitish “powder” coating the leaves, in some cases causing them to become highly distorted. Hello, I wonder if you can help. There are no other oaks nearby (in fact not many trees at all!) We are testing oak trees grown from seed, sourced from different climatic zones, to see if they are more or less susceptible to disease. We have 3 specimen Oaks planted 16 years ago in a grass field . I noticed this about 12 years ago on young oaks in Kilcooley Wood, Bangor Co. Down. I’m based in the Highlands very close to the Cairngorms. Observatree – the official project website, http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0329.2008.00544.x/full. The fungus is a species of powdery mildew. Thanks 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. Notice that this disease doesn’t seem to affect Turkey Oak (or at least not so much) which might be one reason why it is spreading…. It has survived the powdery mold thus far, but the healthier it gets, the more the mold takes hold. )-Powdery Mildew Cause Erysiphe alphitoides (formerly Microsphaera sp. Powdery mildew of live oak is a fungal disease that prefers attacking young foliage growing in shady conditions. Thank you. I am not even sure this this the right site to ask this question, however I’d appreciate any help. 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. Clearing undergrowth is therefore a good idea. Sometimes trees standing within 4ft of an infected one remained unaffected. Prevent powdery mildew by spraying a live oak every seven to 14 days until the weather no longer promotes disease development. For more tips on how to reduce mildew on very young trees I would try contacting your nearest nursery – they will be very familiar with dealing with mildew! I am happy to hear you are growing trees! Hi Elsa, Removing and discarding infected foliage as soon as you spot it helps prevent the spread of the fungal pathogens. Thank you. Powdery Mildew on Live Oak About Powdery Mildew. We trim the lower branches and oak-galled twigs, and keep undergrowth down around it, but it’s come back badly for the three years we’ve lived here. Because the fungi develop only on the surface of leaves, infected trees typically survive and recover to grow new leaves in late summer or the following spring. Chasmothecia develop within the external hyphae and form appendages late in their development. This is the fungal mycelium, the asexual part of the fungus, which grows on living leaf tissue and hungrily taps into the sugars that the plant has busily captured during photosynthesis. Lorna, Hello, Elsa I wonder if you can help. Familiarizing yourself with powdery mildew disease and its treatments can help prevent severe damage and keep your live oak looking handsome. My garden is on the Baltic in Northern Germany.The traditional treatment here is to wash them with milk. Hi Gretchen Heber, Hello, Elsa They are all under 6ft high and less than 9 years old, grown from acorns. I don’t know much about Dogwood powdery mildew but it is definitely not the same species, although dogwood is affected by at least one Erysiphe species (same genus as oak powdery mildew!). 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? 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