Crop & Pest Report

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Entomology

jan.1

Mystery Insect (05/12/16)

This large worm (or larva) about 2 inches long was found tunneling into the heartwood of an old ash tree near Minot, ND.

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jan.3

Continue to Scout for Cutworms (05/12/16)

Cutworms are still being reported causing damage in winter wheat, spring wheat, and field peas in NW and SW North Dakota, and NE Montana.

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jan.4

Cereal Aphids Arrive Early (05/12/16)

Our first cereal aphids, English grain aphids and bird cherry oat aphids were detected in wheat last week in Cass and Richland counties in southeast North Dakota.

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mark.1

Watch for Insect Pests in Seedling Sugarbeet Fields (05/12/16)

The early start to field preparation this spring likely resulted in some sugarbeet seed being planted into cool soils.

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ent.knodel.4.crane fly

Mystery Insect (05/05/16)

A few questions have come into the office on what these large mosquito-like insects are!

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Updated NDSU Extension Entomology Bulletins (05/05/16)

These revised crop insect pest publications summarize the Integrated Pest Management practices for that insect, including identification, life cycle, crop damage, pest monitoring, cultural control, host plant resistance, biological control and chemical control.

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Good Bug Corner - Good Bugs and Fungi (08/27/15)

This week’s Good Bug Corner features several good bugs and fungal pathogens.

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Armyworms in Wheat and Barley (07/09/15)

Armyworms are becoming a concern in maturing wheat and barley fields in Cass, Grand Forks and Steele Counties of North Dakota.

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Good Bug Corner - Giant Black Parasitic Wasp (07/09/15)

This week’s Good Bug Corner featured insect is Megarhyssa atrata, in the family Ichneumonidae.

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ent.knodel.3.acc midge degree days

Wheat Midge Wheat Midge Degree Day Update (07/09/15)

The degree-day model (NDSU North Dakota Agricultural Weather Network website) indicates that 50-90% of the females have emerged and are flying.

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Good Bug Corner - Ambush Bug (07/02/15)

This week’s Good Bug Corner featured insect is the ambush bug, Phymata sp., in the family Reduviidae.

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ent.knodel.8.leafy spurge beetle map

Degree Day Update for Leafy Spurge Flea Beetles (07/02/15)

Using the sunflower GDD model from NDAWN, the accumulated growing degree days (AGDD) for leafy spurge flea beetles indicate that we can collect flea beetles (AGDD = 1,200 to 1,600) throughout the state.

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Wheat Stem Sawfly Flying (07/02/15)

Several field reports of low numbers of wheat stem sawfly adults flying in wheat have been received from NC (Ward-Mountrail Counties between Max and Parshall), NW (McKenzie County) and SW (Sioux County) areas of North Dakota (IPM survey data).

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ent.knodel.3.midge mappng

Wheat Midge Populations Lower in 2015 than 2014 (07/02/15)

Soil samples in North Dakota indicate decreased levels of overwintering wheat midge larvae (cocoons) for the 2015 season.

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ent.knodel.4.adult barley thrips

2015 Economic Thresholds for Barley Thrips (06/18/15)

Fifty-eight percent of the barley is in the jointing crop stage in North Dakota (USDA NASS, ND – June 15, 2015) and susceptible to damage from barley thrips.

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Alfalfa Weevil Degree Day Update (06/11/15)

The southeast area of North Dakota has accumulated enough degree days (DD) for the major leaf feeding stage (504 to 595 accumulated DD) by weevil larvae.

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Cereal Aphids Arrive (06/04/15)

Our first cereal aphids were detected in McHenry County in the NC area of North Dakota at sub-economic level, 14% incidence, on durum wheat by the IPM Scout, Jacee Aaseth. Scouting over the next month will be important for the wheat (spring, durum and winter), oat and barley.

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Good Bug Corner (06/04/15)

This week’s featured bug is the syrphid fly or hoverfly (Diptera: Syrphidae). There are about 1,000 species of syrphid flies in North America, and are common in field crops.

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Sugarbeet Root Maggot: The Calm before a Pending Storm (06/04/15)

Although sugarbeet root maggot (SBRM) fly activity is currently at low levels throughout most of the Red River Valley (RRV), all indicators thus far suggest that some sites within the Valley will experience very high populations this year.

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