Crop & Pest Report




Fall Needle Drop in Conifers (09/13/18)

During autumn, deciduous trees like green ash and linden change color and lose their leaves. This is normal and expected. It happens every year and people are used to it. When needles of evergreen trees turn brown and die, it’s definitely unexpected, but not necessarily abnormal.

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Trapping for Emerald Ash Borer (05/24/18)

Crews are placing purple prism traps across the state to monitor for emerald ash borer (EAB).

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knodel johnson

Tent Caterpillars are Feeding on Chokecherry and Other Trees (05/24/18)

Eastern tent caterpillars (Malacosoma americanum) and forest tent caterpillars (Malacosoma disstria) are feeding on tree foliage now.

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l.johnson EAB

Emerald Ash Borer a Giant Leap Closer to North Dakota (05/03/18)

The Canadian Food Inspection Agency (CFIA) confirmed emerald ash borer (EAB) in Winnipeg, Manitoba in December 2017.

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Taking Care of Trees after a Storm (07/13/17)

While most of the discussion recently has been focused on drought, some parts of the state are dealing with the aftermath of heavy storms.

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You Can Take the Birch out of the Forest But… (06/22/17)

Birch trees are found in cool northern forests where the soil is slightly acidic.

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Drought Stress on Newly Planted Trees (06/08/17)

With nearly 1 quarter of North Dakota experiencing ‘moderate drought’ and the remainder of the state observing ‘abnormally dry’ conditions, recently planted trees may be suffering from drought stress.

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Leaf Galls Already Observed…(06/01/17)

A number of different pests – insects and mites – produce a variety of galls on tree leaves. We normally don’t observe galls until later in the summer – late June through August. This year, I’ve already observed the galls produced by the maple bladder gall mite.

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Green Banding on Ash Trees (05/25/17)

Communities across the state are participating in Emerald Ash Borer Awareness week by placing bright green bands on a sampling of their municipal ash trees. Each band has a printed message along with a QR code that links smart phones to information at

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Basic First Aid for Snow-Damaged Trees (05/04/17)

Heavy snows have melted, exposing a lot of the damage they did to North Dakota’s trees this winter.

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forestry.zeleznik.bergdahl.ash anthracnose

Ash Anthracnose – A Recurring Problem (05/28/15)

Cool and moist weather during the period of ash budbreak has again led to high levels of ash anthracnose, a leaf disease common to our region.

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