What is the characteristic appearance of a Winter Moth infested canopy?
Answer
Skeletonization, where only leaf veins remain intact
The feeding pattern of the Winter Moth larvae often leads to a specific type of foliage damage known as skeletonization. As the caterpillars feed, they consume the soft, fleshy tissue between the leaf veins. If the infestation is moderate to heavy, this leaves behind a net-like structure where the primary veins of the leaf remain attached to the twig, but the majority of the leaf lamina has been eaten away. Early feeding may occur within the protected space of the opening bud, resulting in stunted or ragged leaves, but the characteristic sign of established feeding progression is this vein retention.

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