Tag Archives: green alder sawfly

Invasive alert! Alder-eating sawfly discovered in Sitka

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An invasive insect that is doing widespread damage to alder trees in Southcentral Alaska has now been discovered in Southeast. A Forest Service entomologist is fairly certain that the bright green caterpillar which recently defoliated a small tree in a Sitka neighborhood is the green alder sawfly, which is native to North Africa. more