Tulip Tree Aphid (Illinoia liriodendri) GDD Window (base 50): 1151-1514, 1917-2033 Overview: Wingless aphids are 1/8” long, spindle-shaped, and pale greenish-yellow or pinkish-red, with black antennae that are longer than … Read More
Orange-Striped Oakworm (Anisota senatoria) GDD Window (base 50): 1917 (egg hatch) Overview: Moths are brown with a white spot and a dark stripe down each wing Male moths are smaller … Read More
European Hornet (Vespa crabro) GDD Window (base 50): 1388-2271 (1st activity) Overview: Amber, honey-colored wasps that are 2x the size of bald-faced hornets Gouge bark sections to mix the woody … Read More
‘Dog-day’ Cicada (Neotibicen canicularis) GDD Window (base 50): 1500 (approx.) adult emergece Overview: Often overlooked because periodical cicadas are more publicized Emerge early July and die by mid-September Can be … Read More
Bark Cracks of Tree Trunks Drought Cracks: Susceptible trees: maple, honey locust, crabapple, mountain ash, London-plane Occur most commonly when trees are first planted and a year or so after transplant … Read More
Azalea Whitefly (Pealius azaleae) GDD Window (base 50): 448-700 (1st gen), 1250-1500 (2nd gen), 2032-2150 (3rd gen) Overview: Tiny, 1/16” long, powdery white insects that look like very small moths … Read More
Juniper Webworm (Dichomeris marginella) GDD Window (base 50): 1645-1917 Overview: Spins silk to fasten together the needles and twigs of juniper Overwinter as partially grown black-headed, brown striped worms inside … Read More
Predacious Mites (Phytoseiidae) Overview: Commonly found in and amongst spider mite populations Lay eggs singly in spider mite populations on the bottom of surface leaves along the veins All … Read More
Mimosa Webworm (Homadaula anisocentra) GDD Window (base 50): 880-1200 (1st gen egg hatch), 1800-2100 (2nd gen egg hatch) Overview: Overwinters as pupae in cocoons, and within bark flaps and cracks … Read More
Plant Leaf Galls (Eriophyid mites) Overview: Abnormal growths triggered by various factors Appear as bumps, bladder, & spindle galls, or Erineums (dense cluster of plant hairs) as a plant’s reaction to the presence or activity of foreign substances Appear … Read More