![]() ![]() While the exact cause may not be clear, it does appear that conditions that lead to tatters occur while the leaves are still developing. ![]() We once had samples from a white oak tree that showed symptoms of tatters and leaf curl every year, yet was located in the middle of a heavily forested area miles away from any agricultural fields that might have been a source of herbicide drift. Supplement to LEAF Unit 7-8, Field Enhancement 1, Tree Identification. They are helpful resources when leaves, fruit, or seeds are not present or are too high on a tree to be examined. Hang them on trees to be identified or use them in the classroom. In many instances there is no direct link to herbicide drift. Key for all cards (PDF) Print, cut out, and laminate these cards of common Wisconsin trees. Researchers have shown that acetochlor and s-metolachlor drift can cause tatters-like symptoms but results were variable, and in some treatments red oaks were more affected than white oaks, contrary to the expected results. Right photo is a type of white oak showing rounded lobes. Left photo is a type of red oak showing bristle-tipped lobes. Canyon Live ( Quercus chrysolepis) This oak species is one of the most well-distributed in California and has gradually adapted to the state’s geography. Red and white oaks can be distinguished by the tip of their leaf lobes. Acorns: egg-shaped with a saucer-like cap. In 2020 we saw a distinct link between tattered oak leaves and a late spring frost that year but the connection is not always so clear cut. This Smart Gardening guide will help you distinguish between the 10 most common species of oaks in Michigan. Several possible causes for this symptom have been proposed, including poor growing conditions, insect injury, leaf diseases, late spring frost damage and herbicide drift however, no single factor serves to explain all the cases. We have seen this problem on white oaks for many years in Indiana and it has been reported in other states throughout the Midwest. However, a closer observation of the leaves will reveal that the leaf tissue has not been removed, but rather, it never developed normally. Upon initial inspection the leaves look as if they have been shredded or severely fed upon by insects. Distorted new growth and tatters are most common on white oaks and may occasionally show up on red oak, hackberry and other trees. ![]()
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