Gypsymoth egg masses are laid on branches and trunks of trees, but egg masses may be found in any sheltered location.
Gypsymoth infestations altertnate between years when trees experience little visible defoliation (gypsymoth population numbers are sparse) followed by 2 to 4 years when trees are visibly defoliated (gypsymoth population numbers are dense).
Diseases caused by bacteria, fungi, or viruses contribute to the decline of gypsymoth populations, especially during periods when gypsymoth populations are dense and are stressed by lack of preferred foliage.
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