Crop & Pest Report

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Entomology

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2017 IPM Survey Results – Small Grain Summary (09/14/17)

The purpose of the IPM (Integrated Pest Management) Survey is to detect the presence and population levels of diseases and insect pests in various crops, including those that are common in wheat and barley grown in North Dakota.

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Wheat Stem Sawfly Lodging (08/31/17)

Lodging from wheat stem sawfly was observed this past week near Grenora in Divide County, northwest North Dakota (Source: Clair Keene, Area Extension Specialist/Cropping Systems, Williston REC).

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Late Season Soybean Aphids (08/31/17)

Soybean aphid infestations near the economic threshold (E.T.) of 250 aphids per plant and 80% incidence have been reported in some soybean fields in the R6 (full seed set, green seed that fills pod in one of four uppermost nodes) in southeast North Dakota.

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2nd Generation of Thistle Caterpillars in Soybeans – Scouting Tips (08/17/17)

The 2nd generation of thistle caterpillars are causing feeding injury on soybean leaves (defoliation), mostly low or non-economic populations.

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Spider Mites in Soybeans in NC ND (08/17/17)

Spider mites are starting to be found in some soybean fields, mainly field edges, in north central ND.

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Red Sunflower Seed Weevil High (8/03/17)

Field reports indicate that populations of red sunflower seed weevil are high, average of 20-30 weevils per head in the southwest and south central parts of North Dakota.

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Corn Rootworms Emerging (8/03/17)

Corn rootworm adults were reported emerging the last two weeks in southeastern and south central North Dakota.

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Pyrethroid Resistant Soybean Aphids: What are your Control Options?(8/03/17)

We have received a number of reports of pyrethroid insecticide failures for soybean aphid management from northwest and central Minnesota, and northeastern North Dakota this year.

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Sunflower Seed Maggot In Sunflower Heads(8/03/17)

Field reports of a small, golden brown pupae in the face of sunflower heads, usually surrounded by a small number of damaged florets are being reported in south central, north central and northeast North Dakota.

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‘Good Bugs’ Out In Fields (07/27/17)

While scouting, it is easy to find many ‘good bugs’ in fields, especially fields with aphid infestations.

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Wanted: Soybean Aphids

Minnesota Extension Entomologists have reported pyrethroid resistance in soybean aphids in southwest and northwest Minnesota for the past 3 years.

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Corn Aphids (07/27/17)

Large numbers of aphids are being reported in field corn in southeast North Dakota.

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European Corn Borer Scouting (07/27/17)

With more non-Bt corn planted this year, it is important to scout corn fields for European corn borer. Limited spraying for corn borer has been reported in the Valley City area.

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Potato Psyllid Detected in North Dakota (07/27/17)

Potato psyllid, Bactericera cockerelli, was detected last week in a commercial potato field near Tappen in central North Dakota.

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Japanese Beetle Detected In Traps (07/27/17)

Japanese beetles have begun to emerge as adults. Live adults were collected from traps at 4 nurseries on the east side of the state in Cass and Richland Counties.

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Painted Lady Butterflies Flying (07/27/17)

Swarms of painted lady butterflies can be seen when driving by soybean and other fields.

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Canola Flea Beetle Feeding on Pods (07/27/17)

The new generation of crucifer flea beetles is emerging, and feeds on the green foliage and developing pods.

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White Heads from Wheat Stem Maggot (07/20/17)

IPM scouts detected an unusually high percentage of white heads that were damaged by the wheat stem maggot, Meromyza americana.

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2017 Action Threshold for Banded Sunflower Moth and Red Sunflower Seed Weevil (07/20/17)

The USDA NASS reports that 9% of the sunflowers were blooming in North Dakota as of July 17th (USDA NASS News Release).

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New Corn Rootworm Extension Publication (07/20/17)

If you grow corn, you should be aware of corn rootworms in North Dakota.

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