There are numerous species of coniferous trees. Many are prone to a range of diseases and insect infestations. The best way to combat these problems is to stop them before they happen.
The alligator juniper is prone to spider mites, bark beetles and the tiger moth. Diseases are western cedar borer, true mistletoe and gymnosporangium rusts.
The one-seed juniper also has problems with spider mites, bark beetles and the tiger moth. They also have problems with true mistletoe, gymnosporangium rust and western cedar borer.
Pinon pine tree pests are pinon needle scale, pinon tip moth, pinon nodule moth, pinon spindle gall midge, pitch moth, sawflies, pinon needle miner, bark beetles, tiger moth and twig beetles. Diseases are dwarf mistletoe and needle casts.
The insects that can infest the Ponderosa pine include the mountain pine beetle, the bark beetle, pine tip moth, pine needle scale, sawflies, Ponderosa needle miner, the tiger moth, the twig beetle, the pitch moth, conifer aphids and the bark moth. Diseases include dwarf mistletoe, minor needle cast and root rot.
The Austrian pine diseases are road salts and environmental stresses. This pine is more susceptible to weather conditions and negative environmental changes. Insects to watch for are twig beetles, bark beetles, conifer aphids, pine tip moth and pine needle scale.