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...
The Control of Japanese Beetles You know it is summer in Denver when we start handpicking Japanese Beetles (Popillia japonica) off plants in our yards. The beetles favor roses, grape & Virginia Creeper vines, but the pests are generalists and attack many plants...
Newly Planted Tree Care Tips Wondering what to do after planting a new tree? Below are some tips after the tree is in the ground. For the last 35 years, Denver Digs Trees has been a significant force in expanding the City’s urban forest by providing more than 60,000...
Elm Leaf Pests Homeowners should know that Elms growing in Denver need additional attention. The City has Elm leave pests that feed on elm leaves, causing them to dry up and die. Heavily infested trees are unsightly with brown and skeletonized leaves. Repeated...
An Introduction to Horticultural Oils Dormant and horticultural oils are effective against exposed tree insect eggs, larvae, pupae, and adults. Dormant oils are sprayed on trees in the winter before their buds open in the spring. In Denver, these oils can be used in...
