Ambrosia Beetle (Xylosandrus) GDD Window (base 50): 75-815 Overview: New Jersey notable species: Black stem borer (Xylosandrus germanus),granulate (Asian) borer (Xyleborus crassiusculus) Small, reddish brown to black, cylindrical beetles from 1/8 – … Read More
Spruce Spider Mite (Oligonychus ununguis) GDD Window (base 50): 7-121 Overview: Eggs are brown, round, flattened and have a thread sticking up fromtheir center Growth from larvae to adult happens … Read More
Southern Red Mite (Oligonychus ilicis) GDD Window (base 50): 7-91 Overview: Overwinters as red eggs on host plant leaf undersides Eggs hatch into pale, six-legged larvae Two nymph stages, protonymph and deutonymph, each … Read More
Hemlock Rust Mite (Nalepella tsugifoliae) GDD Window (base 50): 7-450 (7-22: active mites emerge) Overview: Tiny, wormlike insects that require magnification to be seen In the spring, scout using a … Read More
Cool Season Mites (Eriophyidae) GDD Window (base 50): 7-363, depending on species Overview: Tiny, often “carrot-shaped,” translucent white Can only be seen with magnification (1/100″ in length) Usually two pairs … Read More
Boxwood Leafminer (Monarthropalpus flavus) GDD Window (base 50): 290+ (adult emergence), 448-700 (larvae emergence) Overview: Overwinters in the leaves as larvae Larvae are bright yellow or orange and become active … Read More
Boxwood Blight (Calonectria pseudonaviculata) Overview: Fungal infection – caused by Calonectria pseudonaviculata Characterized by leaf spots, rapid defoliation, and stem lesions Leaves turn brown or yellow, with darker boarders Stem … Read More