The two center balsam fir are severely defoliated by spruce budworm while the outer two trees are less severely defoliated.
Spruce budworm defoliation is starting to show up in the northern counties as the clipped foliage stuck in the caterpillar webbing turns rusty red. Defoliation this year may be reduced in some areas if the caterpillars were damaged by the multiple storms we’ve had this spring. Let us know where you’re seeing defoliation. The caterpillars should be pupating soon and moths will emerge a couple weeks after pupation. Spruce and balsam fir are defoliated by this pest, which is a native insect with periodic outbreaks.
Outbreaks occur every 30-50 years, and last for 10 years on average. Our previous outbreak ran from 1970-1980. Mature balsam fir and spruce are preferred hosts, although younger balsam or spruce can be defoliated as well. Repeated defoliation can cause top-kill and eventually whole tree mortality. Balsam fir stands, or stands with a heavy component of balsam fir, are often more severely impacted, but don’t let that fool you into thinking it won’t defoliate pure spruce stands. Continue reading “Spruce budworm defoliation showing up”
Breathe in… breathe out. The clear air that fills your lungs has been purified by trees. Clean air is one of the many ecological, economic and social benefits trees provide us. Trees also reduce crime rate, increase property values, reduce heating and cooling costs, increase tests scores, beautify communities, and provide lumber by-products. In late April, people around the world, both old and young, took time to celebrate these and other benefits by participating in Arbor Day celebrations.
Green Tier, a voluntary program administered by the DNR, works with entities conducting their business beyond compliance requirements and looking for ways to improve. Currently there are 82 participants with 248 facilities in the program along with six Green Tier Charters, including the 
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A recently published report from The Nature Conservancy titled “Planting Healthy Air,” detailed which cities could benefit most from tree plantings, focusing on the benefit they could gain from the heat and PM (particle matter) reduction credited to tree plantings. This report found that investing $4 per resident in these cities for tree planting could improve the health of millions, further showcasing trees as a cost-effective solution for air pollution and heat islands, among many other urban difficulties.
A severe storm on May 16, 2017 left a path of destruction through some woodlands in Barron and Rusk counties. 