Forest Insect & Disease Newsletter - July 2020

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minnesota department of natural resources

Forest Insect & Disease Newsletter


July 2020

red pine shoot moth

Red pine shoot moth outbreak

We haven't seen an insect outbreak like this on pine for many years.

drought map of Minnesota

Some Minnesota trees now dwelling in drought

Drought brings potential for early leaf drop and other stress symptoms.

Effects of past flooding common on trees this year

Past flooding and tree dieback seen in central and southern Minnesota forests.

oak tree shoiwng dieback

Update on forest tent caterpillar and spruce budworm

How prevalent have two native caterpillars been this year?

forest tent caterpillar on road surface

Stop oak wilt in Cass and Crow Wing

Report suspected oak wilt on red oaks in Cass and Crow Wing counties.

screen shot of stop oak wilt webpage

Herbicide damage to trees

Herbicide damage to trees and possible look-alikes.

herbicide damage on pine tree


What is that chewing on smaller pine and spruce trees?

yellow headed sawflies on pine tree

Maple velvet erineum galls

Noticing any colorful, velvety patches on maple leaves?

maple leaf with velvet colored patchs