woolly adelgid

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fighting to save the eastern hemlock

Inside the fight to save the eastern hemlock, Pennsylvania’s state tree

Two invasive insect species are attacking and felling large numbers of Pennsylvania’s state tree, which is prominent in shaded, cool stream valleys and hollows across the commonwealth.
Invasive insects and plants spread northward

Invasive insects and plants spread northward

From tree-eating beetles to crop-smothering vines, pests once found only in more southerly latitudes are expanding their ranges as climate change spurs warmer winters.
invasive species biocontrol

How do you kill an invasive species? Bring in a bigger, meaner species to eat it

Before pesticides, biocontrol was all scientists had to combat introduced insects. Now, the controversial tactic is coming back
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