- Spiders
- FleasFemale weevils mine holes partway through the leaf tissue to lay eggs. These hatch into legless, white larvae that tunnel through soft leaf tissue at the leaf tips turning the tips white, then eventually brown. The bugs jump like fleas when disturbed.
- WaspsIts adults look like wasps. Larvae burrow into the sapwood of the tree trunk of Peach trees. Girdling injuries weaken and frequently kill trees.
- FliesSome people think the tree service industry has been crying wolf about the Emerald Ash Borer (EAB) since 2013. Homeowners with mature Green, White, Black, and Blue Ash and all their cultivars should get them treated before it is too late. These trees have zero immunity to this insect. The EAB showed up in Arvada in 2020. It is just a matter of time before the insect flies to Denver or arrives inadvertently in the back of a pickup in a load of firewood. Since Denver Metro has 1.4 million Ash trees, it will be impossible to book an appointment with a plant health care company once the insect makes its presence known in Denver, so it is best to be proactive. Check out the Ross Tree EAB Handbook for more information about this pest.
- BeetlesInfected trees die within two to four years of first symptoms, even previously healthy trees. There is nearly a 100% mortality rate to ash trees it invades. Adult beetles do not harm the ash, but their offspring burrow through the layers of bark which stops the flow of nutrients throughout the tree. Most people will not notice their ash trees are affected because the EAB larva damage the tree from within. Once a property owner observes their ash trees are sick, it is probably too late. Dead ash trees need to be removed professionally and all tree waste should be handled properly to prevent spreading EAB. Property owners need to be proactive to avoid the cost of tree removal.
- MothsThe leafminer creates winding, serpentine tunnels in Aspen leaves in the spring and summer. Infestations are rarely severe, but some people find their moths a nuisance.
- MitesBy the end of the summer, most trees have set their flower and leaf buds, making the colder months a great time for winter tree care. Tree trimming is easier since there is no foliage on deciduous trees, and pruning at this time prevents the spread of disease in fruit trees. Also, it is a great time to treat mites, scales, and other insects that overwinter as eggs with dormant oils.
- AphidsJun 15, 2022 | Plant Health Care, Tree Health Care, Tree Insect Control Each spring is different in Denver. Last year we had a wet spring, and an Elm Leave Beetle infestation occurred. In 2022, we had a dry early spring with little snow; it rained a lot in late May and early June. Tree aphids thrive in these conditions, and these...
- Boxelder Bugs
- Birds
- Woodpeckers