Pests

Hemlock woolly adelgid (Adelges tsugae) GDD Window (base 50): 10% of eggs – 150, 50% – 350, 100% – 1000; 1001-2200 (nymphs)​ Overview: Overwinter as wingless adults ​ Lay brownish orange … Read More

Redheaded Pine Sawfly (Neodiprion lecontei) GDD Window (base 50): 246-1388 (1st generation) Overview: Overwinter as prepupae in small (½ inch), brown cocoons in the soil​ Adults resemble flies or bees, ½” … Read More

Red-headed flea beetle (Systena frontalis) GDD Window (base 50): 242-600 (egg hatch) & 517-1028 (adults) Overview: Overwinter as tiny, pale yellow, oval-shaped eggs​ Grubs hatch during the second half of … Read More

Spongy Moth (Lymantria dispar) GDD Window (base 50): 90-448 Overview: Overwinter as egg masses covered in yellowish fur, 1.5 inches long and ¾ inches wide on trees, stones, walls, furniture, … Read More

Clearwing Borers Lilac Clear Wing Borer: GDD Window (base 50): 148-299 Dogwood Clear Wing Borer: GDD Window (base 50): 148-700 Overview: Lilac clear wing borer (Podosesia syringae)​ >1 inch long, drab black … Read More

Evergreen Lace Bugs (Stephanitis spp.) Azalea Lace Bug: GDD Window (base 50): 118 (egg hatch), 118-372 (1st gen nymphs) Andromeda Lace Bug: GDD Window (base 50): 115 (egg hatch), 115-279 … Read More

Eastern Tent Caterpillar (Malacosoma americanum) GDD Window (base 50): 90-190 Overview: Overwinter as eggs, black masses that wrap around small twigs of host plants and hatch in the early spring, … Read More

Holly Leafminer (Phytomyza ilicicola) GDD Window (base 50): 147-265 Overview: Overwinter as yellow larvae, 1.5 mm long​ Eggs hatch into tiny maggots within the leaf mine, causing the most damage … Read More

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