I am looking to plant a few pear trees in my yard. I'm really struggling with how to select good varieties that will be disease-resistant (for example, fire blight, but also other disea Read Answer

Last summer the Oregon legislature pass a lumber grading class. I and several folks are anxious to take the online class. I taught university engineering classes and the subject woul Read Answer

This American beech tree has developed new patterns of brown growth. Could this be a type of lichen, or something more problematic? Read Answer

Hi there, I am a Landscape architect working on a project on the Front Range (Greeley CO). I am hoping to include disease resistant crabapples, Amelanchier (Malus x Indian Summer, x Read Answer

Bugs found in basement at walkout door. Read Answer

Hi, I recently had a client ask me about a white spots on his leaves (see pictures) and I was wondering if this might be microsphaera or some other identifiable pathogen? In any case Read Answer

About a week ago I asked for help finding a Monkey Puzzle tree near SW 107th and Canyon Rd. I originally described it as being on Cedar Hills Blvd and realize that those two streets do Read Answer

I have noticed many small (2 -3 in. diameter) mounds of intentionally gathered pine needles that each cover a small burrow about .25 to .5 inches in diameter. I have not dug any up. Can Read Answer

I've checked several online sources, plus a local nursery. There seems to be no consensus on whether comice pears require a pollinator. We have a comice and plan to buy another pear tre Read Answer

I would like to attach very large bird feeders up to five gallons to trees up north using metal arms attached to trees with stainless steel metal screws. Am I endangering the trees in Read Answer