April-May 1977 - Laserfiche WebLink

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ARDEN HILLS TOWN CRIER - TREE INFORMATION 1977 To refresh everybody's memory on just ghat we're looking for, here is some information about elm and oak trees: One of the easiest ways to recognize American Elm is to break off a piece of bark and look at it cross -wise or side -ways. The bark is composed of alternate layers of dark and light wood. The leaves of as American Elm are smooth to the _touch, whereas leaves of the Chinese Elm are rough. The tree itself has the shape of a vase. All apeoies are susceptible to Dutch Elm disease, the American Elm being to,some degree more so. The disease is spread in two ways: 1) Beetles feeding in the crotches of small twigs; and 2) through root systems that are close to each other, normally within 50 feet. The disease causes a wilting of the leaves, and if you were to+peel back the bark of a small twig of a freshly wilting branch and find the wood stained brown, you would be looking at a tree infected with Dutch Elm disease. You may try this method yourself, but please let a qualified Tree Inspector make the final decision. AMERICAN ELM Bark Dark �.. Light Regarding the oak trees, it is very impor nt that they NOT be period of May 15 -June 15. Any new cuts or bark injuries to oaks(suchruned during the critical l � -(such as bruising them with your lawn mower) should be treated immediately to prevent beetles from entering the tree. Treat injuries with a paint -on preparation available at hardware and lawn and garden shops. Here is how you can tell the difference in your oak trees. The information is import- ant in the detection and prevention of oak wilt disease. Red oaks are the most suscep. tible species to oak wilt disease in the oak family because the disease can be transmitted through the root system to other healthy red oaks and can also be spread by beetles feeding under the bark where spores are produced. Red Oak is the only specie that pro- duces these spores under the bark. White and bur oaks can only spread the disease through their common root systems. In order to transmit disease through the root sys- tems, the trees must be of the same species, that is red oak to red oak- "- ITI ak_ WHIT2 OAK Red oaks have pin-like structures on the tips of their leaves. White oaks and bur ' oaks do not have these. White oaks have many rounded "fingers" on their leaves. Bur oaks have rounded "fingers" like the white oak, but only towars the base of the leaf.