Warren County Connection - April 2022

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Warren County Connection A Publication of Cornell Cooperative Extension of Warren County

April 2022

Understanding Gypsy (Spongy) Moth Outbreaks Gypsy moths (also known as the North American Gypsy Moth or the European Gypsy Moth) were imported to North America from Eurasia in 1869 for a silk production experiment. They have caused periodic defoliations in New England since then and particularly severe defoliations in the early 1980s and again in Connecticut and Massachusetts in 2016 and 2017. (Gypsy moths do not build webs – the webs you see in cherry trees are tent caterpillars.) Female moths lay between 500 and 1,000 eggs that overwinter until spring when they hatch. Eggs are usually found underneath the bark scales of trees, on trunks, branches or other protected sites. Eggs last for 8-9 months before they hatch. Adults only live for about one week while they mate and lay eggs. Gypsy moth populations can persist with very low numbers for years but under the right conditions can have outbreak years where populations explode. The caterpillars feed on leaves of most deciduous trees and many conifers as well. After feeding for some time they descend to the ground by means of silk threads to change size (molt). Silk threads and numerous hairs on the bodies of small, earlyinstar (stage) caterpillars allow them to be spread by the wind. These caterpillars change size three times before entering the pupal stage and maturity.

In this issue:

Photo by: Tom Worthley

Gypsy moths only damage trees during the larval (caterpillar) stage when they are feeding on the leaves, and leaf-feeding and defoliation is the only type of damage they do. In high numbers they can completely defoliate the trees. One gypsy moth caterpillar can eat as much as eleven square feet of leaf area. Most deciduous trees have the ability to re-set buds and produce a second set of leaves following defoliation. Coniferous trees do not have this ability. Multiple defoliations can be problematic for the trees. Gypsy moth caterpillars will feed on most (Continued on page 3)

Master Gardener Corner: Growing Plants from Garbage

3

Pocket Gardening for Small Spaces

5

Scented Geraniums

6

Brushing is Best for Pet Dental Health

7

Four Tips to Help You Eliminate Food Waste & Save Money

8

Building Strong Family Relationships

9

Improve Your Memory with Super Foods

Special points of interest: •

Calendar of Events

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