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Introdution of the Pine Sawfly
The introduced pine, sawfly (Diprion similis (Hartig)) in North America was first discovered in 1914 in a nursery in New Haven, Conn. This insect might have been introduced in the cocoon stage on nursery stock or packing material from Holland. -
Pennsylvania
The pine sawfly advances west into Pennsylvania. -
Ontario
And on into Ontario, Canada by 1931 -
Period: to
Sawfly
This invasive and harmful species continues thriving and harming various pine trees