Conifers
Arborvitae Leafminer (14) moths recently emerged from a LIHREC sample held indoors; watch for them in the coming week. The small (1/8”) pale moths with dark markings will be overly interested in arborvitae. Conserve/Entrust can work well at this timing or Acephate 97UP [2(ee) label] later in summer.
Common Bagworm (80, 81) eggs should be hatching now. Check previously infested conifers for small, pendant “bags” covered with green plant parts which will become more apparent by July. Bt, Conserve/Entrust and several other insecticides all work well.
Cottony Taxus/Camellia Scale (164) crawlers emerging now on LI. One sample at the LI Diagnostic Lab also had several mealybug-like Hyperaspis (lady beetle) larvae grazing on egg masses. Also watch for euonymus and white prunicola scale crawlers; latter were heavy on one sample and bright orange-yellow.
Juniper Scale (46)—crawlers in Albany Co.
Pine False Webworm (4)—on eastern white pine in Tompkins Co.
Spruce (35)—conifer aphids active on terminals in Monroe Co.
Woolly Larch Aphid (32)—on larch in Westchester Co.
Broad-leaved trees and shrubs:
Maple Anthracnose (54)—caused by several different fungi, has been noted in Ithaca and LI. Irregularly-shaped black or brown lesions often follow veins. Fungicide treatments should be done during bud opening and leafing out to be effective.
Apple Scab (42-45)—leaves of untreated crabapple on LI & Ithaca showing dark, greenish-black colonies of scab fungus. Defoliation in Ithaca.
Black Vine Weevil (20, 112)— notching on young rhododendron leaves in Monroe Co.
Boxwood Psyllid (137)—in Putnam Co.
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