Swiss Needle Cast Overview: Fungal disease caused by the fungus Nothophaeocryptopus gaeumannii (aka: Phaeocryptopus gaumannii) Impacts Douglas-fir Growth and symptom development is favored by wet environmental conditions Needles become discolored (blotchy yellow or completely … Read More
Rhabdocline Needle Cast Overview: Foliage disease caused by fungi in the genus Rhabdocline Primarily impacts needles of Douglas-fir (Pseudotsuga menziesii) from seedling stage to 30 years of age Outbreaks are associated with … Read More
Needle Cast Diseases Overview: There are many diseases that impact conifer foliage Particularly harmful to Douglas fir and spruce trees Causes needles to turn brown, yellow, or purple, and eventually drop … Read More
Fourlined Plant Bug (Poecilocapus lineatus) GDD Window (base 50): 90-1500 Overview: Eggs overwinter in tender shoots and plant debris Nymphs hatch as small adults with black and yellow striped … Read More
Oystershell Scale (Lepidosaphes ulmi) GDD Window (base 50): 363-707 (egg hatch and crawler emergence) Overview: Overwinter as tiny white eggs under the waxy cover of the female Eggs hatch … Read More
Elongate Hemlock Scale (Chionaspis pinifoliae) GDD Window (base 50): 360-700 (1st generation) Overview: Overwinters as egg or as female carrying egg Females are oval, flat, and tan/translucent, males are … Read More
Pine needle scale (Chionaspis pinifoliae) GDD Window (base 50): 298-448 (1st generation), 1290-1917 (2nd generation) Overview: Overwinter as live females or bright red eggs beneath the wax cover of … Read More
Armored Scales (Diaspididae) GDD Window (base 50): variable depending on species Overview: Characterized by a hard, waxy, protective covering that is separate from their body, making them less susceptible to … Read More
Boxwood Psyllid (Spanioneura buxi) GDD Window (base 50): 290-440 Overview: Overwinter as orange, spindle-shaped eggs Nymphs emerge and begin feeding as buds expand Nymphs feed on young foliage by piercing … Read More
Boxwood Mites (Eurytetranychus buxi) GDD Window (base 50): 450-700 Overview: Overwinter as light-yellow eggs on leaves and twigs Neither a true cool nor warm season mite – most active during … Read More