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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.
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The pine sawfly advances west into Pennsylvania.
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And on into Ontario, Canada by 1931
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This invasive and harmful species continues thriving and harming various pine trees