Forest Insect & Disease Newsletter

photo collage black mold on maple, witchs' broom, anthracnose on ash leaves, white pine with brown needles

August 2019

oak tree showing decline

Older bur oaks dying in forests from multiple stressors

There may be an upward trend of older bur oaks dying in Minnesota. Read more



oak tree showing signs of BOB

Bur oak blight starting to show

Bur oak blight will have a heyday in 2019. Read more


oak tree with two-lined chestnut borer

Do your trees have oak wilt?

How to tell the difference between the nonnative oak wilt and the native twolined chestnut borer. Read more


close of jack pine tip with budworm

Jack pine budworm populations at rock bottom in north-central Minnesota

You probably don't need to worry about jack pine budworm in 2019. Read more


maple leaf with bumps

Bumps, bladders, and growths: galls on leaves and branches

Want to know more about the galls growing on your trees? Read more


paper birch leaf showing yellow areas

Leaf mining in birch trees

Leaf mining business is booming. Read more


view of several spruce tree that are brown

Spruce budworm damage continues

Steady as the spruce budworm goes. Read more


brown slim

Name that creature!

What is that? Read more


pine forest

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