Elm Tree Fungus and Pests
If you have elm trees planted in your garden, you should pay attention to some threats on these trees including fungus and pests. They will result in severe damage on your elm trees if no actions are performed as early as possible.
Dutch elm tree disease is a common fungi threat to elm trees. Generally this type of fungi is spread by some insects or from the time of grafting from another tree. They will do harm to the vessels of the tree which are essential to transmit water and nutrients. This will cause the leaves to turn yellow and turn off eventually due to lack of water and nutrition. This fungi disease can spread very quickly and you should take actions as early as you can. This disease will cause apparent damage on your foliage within about a month.
Asian Longhorned Beetle is a common pest which will damage some part of the wood. The damaged part will affect the transplanting of the nutrients from the root to the foliage on the top. Although it may take several years to see the overall damages on the foliage, you still need to take actions quickly. Some pesticide from the nurseries can be applied to get rid of the beetles to protect your trees.
Another common beetle pest of elm trees is the Elm Bark Beetle. They are actually the main carrier of the Dutch elm tree fungi and spread them to other elm trees. These beetles’ larvae will feed on the tree, and they will carry Dutch elm fungi spores as well. They will spread the fungi when moving to another healthy tree. If you observed some red sawdust on your tree, you should be careful and a thorough check is highly recommended.
Image provided by Christine Matthews [CC-BY-SA-2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons