Pests/Problems: White pine needle shedding is approaching its peak in the region. As older, diseased needles are shed, the fungal pathogens responsible for the blight are actively sporulating. Even minor rain events and high nighttime humidity provide enough moisture for these fungi to attack newly developing needles. Once old needles are prematurely shed, infected trees can look very thin but will flesh out as the new growth expands during the month of June. Continue to carefully scout trees and shrubs for webbing/rolling/chewing caterpillars, armored scales, spider mites, among other sometimes cryptic insect pests. There appears to be high populations of striped caterpillars (genus Pyreferra) on native witchhazel this year. Scattered defoliation and caterpillars have been observed at several sites in the valley. Further discussion can be found below in the Insects section. Oriental bittersweet, Japanese barberry, Japanese knotweed, multiflora rose, and many other invasive weeds are growing at a breakneck pace. Increasingly, it seems that knotweed can be found encroaching into upland sites away from riparian zones. Mosquitoes, black flies, wasps and hornets are all very active. Scout for paper nests produced by hornets and wasps under decks and other spaces around the landscape while the colonies are still small. Ground nests will be more challenging to locate until the colonies are larger.
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