Q. Two of my dwarf Alberta spruce has a problem that causes the needles to turn brown and fall off. I have tried insecticide and fungicide to control the problem. One of the trees looked much ...

In recent years, most all spruce varieties have been having difficulty fighting off the fungal disease Rhizosphaera needle cast. This fungal disease causes premature death and casting of needles ...

“Evergreens shed their older needles to make room for new growth, but what makes these plants evergreen is that they retain some foliage all year long instead of shedding all of the leaves at once.” ...

I’ve seen twigs and buds of pine and spruce swell up when subjected to the misapplication ... or the tree’s roots picked up the herbicide. When the needles on a pine curl, it is most often due to a ...

This species also produces silken webs on the needles. Since needles on spruce do not recover from damage by mites, it can be a huge issue on specimen shrubs like Dwarf Alberta spruce. My ...

Jillian Patrie | University of Minnesota Yard and Garden Extension ...

The cones are cylindrical and upright and the shape is very narrow with rigid, upright, or horizontal branching as opposed to "drooping" branches on some spruce trees. Fir tree needles are soft ...

Rhizosphaera needle cast is a fungal disease, caused by Rhizosphaera kalkhoffii that attacks the needles of Colorado blue spruce in the spring, as new needles emerge. However, infected needles often ...

A: The indication in the photograph (shown here) are classic symptoms of a common foliar disease called Rhizosphaera Needle Cast, which routinely affects Colorado Blue Spruce growing outside of ...

Identification of the Common North American Spruce Trees Spruces are large trees and can be distinguished by their whorled branches where needles radiate equally in all directions around the ...

Purdue Landscape Report: We receive a large number of spruce samples each year at the Purdue Plant and Pest Diagnostic Laboratory (PPDL), with the vast majority being from Colorado blue spruce with ...

Individual upper branches may show these symptoms as well (as you are seeing in your blue spruce). Needles on infected branches turn purple, then brown. The brown needles may remain on the ...