Crop & Pest Report




Fall Needle Drop in Evergreens – This is Normal (09/24/20)

Over the past few weeks, we’ve been getting a lot of calls and emails regarding evergreen needles turning brown or yellow.

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Fall Webworms Starting Early this Year (07/30/20)

Larvae of fall webworms (scientific name Hyphantria cunea) have already been seen feeding on leaves of a poplar tree in Emmons County.

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Tent Caterpillars on Trees and Shrubs (6/04/20)

We’re beginning to see damage from tent caterpillars in eastern North Dakota and western Minnesota. Tent caterpillars eat foliage and in the worst cases, can defoliate entire trees like this chokecherry.

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Wildlife Damage to Trees and Shrubs (05/14/20)

As we come out of winter, many people are noticing damage to their trees and shrubs caused by wildlife.

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Cankerworms – Time to Begin Scouting (04/30/20)

Populations of cankerworms, spring defoliators of deciduous trees, have increased over the past two years causing damage throughout much of the state.

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Begin Scouting for Scale Insects on Trees (07/18/19)

This week we’ve started to notice scale insects on several tree species, including maple, ash, hackberry and others.

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Dutch Elm Disease Reported – Start Scouting Now (06/27/19)

The reports coming in now about wilting and dying American elm trees remind us that Dutch elm disease (DED) was first reported in Mandan fifty years ago and is now found throughout North Dakota.

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Spruce Sawfly Larvae Observed (06/27/19)

Yellow-headed spruce sawflies were seen this week in the Devils Lake area.

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Bur Oaks, Bugs and Birds (06/20/19)

In several communities around the state, young bur oak trees are showing damage from woodpecker activity.

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Cankerworms (06/13/19)

Cankerworms are back in force after a weak showing last year. Both spring and fall cankerworm larvae are out now, and are feeding voraciously on their preferred elm, basswood, boxelder, and apple.

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Ash Anthracnose (06/06/19)

Conditions this spring were ideal for ash anthracnose to develop in ash trees, leaving blotchy, distorted leaves and partial to complete tree defoliation.

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