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Gypsy Moth/Hemlock Woolly Adelgid

Gypsy Moth
Caterpillar that defoliates trees

• PSU Entomology Gypsy Moth Fact Sheet
• APHIS Gypsy Moth page - Information on both European and Asian species
• Gypsy Moth in North America - Information on life cycle, defoliation, spread, natural enemies, management, from Forest Service
• Gypsy Moth Digest - Historical data on gypsy moth defoliation and suppression with maps, photo gallery, from Forest Service

Hemlock Woolly Adelgid
Tiny insect causing death of hemloc trees.

• DCNR Woolly Adelgid page - Biology, life cycle, identification, influencing factors, status in PA
• Forest Service page - Distribution, biology, infestations, quarantines, control, biological control organisms, photo gallery
• PSU Entomology Woolly Adelgid Fact Sheet