While wandering middle Alaska this summer, I noticed orange spruce trees along the entire length of the Denali Highway, from Paxson to Cantwell. In what looked like a dendrological case of frostbite, ...

Larvae of the sawfly Neodiprion edulicolus fed on needles of Pinus edulis and were abundant below 1,850 m in elevation at sites near Sunset Crater, Arizona. Coleosporium needle rust, in contrast, ...

While wandering middle Alaska this summer, I noticed orange spruce trees along the entire length of the Denali Highway, from Paxson to Cantwell. In what looked like a dendrological case of frostbite, ...

Cooler nights and falling leaves signal that fall is here. Pines in the area are starting to change colors too. Knowing the cause of the discolored needles will help to know if it is nature taking its ...

Many of us look forward to fall when leaf colors change to yellows, reds, purples and oranges, creating a beautiful scene along with enjoyable cooler temperatures. But what we don’t expect to see are ...

One of the common problems that we see in the Master Gardener office are conifers losing their needles. Environmental or site-related stresses, such as poor nutrition, fertilizer or chemical burn, can ...