Crop & Pest Report

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Entomology

Soybean Aphid Update (07/20/17)

Continue scouting for soybean aphids. Soybean aphid is slowly increasing and still below economic threshold in most fields.

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Banded Sunflower Moth Flying (07/13/17)

Banded sunflower moth has just started to emerge based on pheromone trapping data from IPM scouts in North Dakota.

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Soybean Aphids & Spider Mites Increasing (07/13/17)

Soybean aphids and spider mites are starting to increase in soybean fields.

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Cereal Aphids on Wheat Heads (07/13/17)

IPM scouts and numerous calls/emails from crop consultants, growers and ag dealers have reported increasing cereal aphid population, especially English grain aphids, on heads of wheat. In some cases, the wheat heads have many aphids on the wheat heads (see photo).

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Dogbane Beetles Widely Reported (07/13/17)

With all of the recent media attention surrounding Japanese beetles in North Dakota, and our request to document and report any suspect insects, NDSU Extension Entomology has received several insect identification requests via photographs and actual samples.

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Thistle Caterpillars in Soybeans (07/06/17)

Thistle caterpillars are being observed at low or non-economic populations in soybeans.

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Japanese Beetle Shipped Into North Dakota (07/06/17)

Japanese beetle, Popillia japonica Newman, has been moving westward since its first detection in the U.S. in 1916 in New Jersey.

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Continue to Collect Leafy Spurge Flea Beetles (07/06/17)

To determine when to begin collecting adult Aphthona flea beetles, use the accumulated growing degree days (AGDD) for sunflower (base of 44 F) on NDAWN.

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Blister Beetles in Canola and Forage (07/06/17)

Nuttall’s blister beetles, Lytta nuttalli, a large purplish green beetle have been reported in canola, soybean and alfalfa fields in southwest, south central and north central areas of North Dakota.

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Collect Flea Beetles for Leafy Spurge Control (6/29/17)

To determine when to begin collecting adult Aphthona flea beetles, use the accumulated growing degree days (AGDD) for sunflower (base of 44 F) on NDAWN - sunflower degree days/growth stage application.

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Wheat Midge Emerging & 2017 Forecast (6/29/17)

Soil samples collected in North Dakota from 2016 indicated low levels of overwintering wheat midge larvae (cocoons) for the 2017 season.

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Pea Leaf Weevil Found in North Central Region (6/29/17)

Pea leaf weevil larvae were collected from a pea field located northwest of Plaza last week.

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Interesting Red Mite (06/22/17)

Are you are seeing bright red spots moving around on top of the soil?

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New Field Pea Insect Pest in SW ND (06/22/17)

Pea leaf weevil (Sitona lineata L.) was found in Golden Valley and Stark Counties last week during a field trip to determine if this insect is established in field peas grown in North Dakota.

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Degree Day Update for Aphthona Flea Beetles (06/15/17)

To determine when to begin scouting for adult flea beetles, use the accumulated growing degree days (AGDD) for sunflower (base of 44 F) on NDAWN – sunflower degree days/growth stage application.

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Barley Thrips Increasing (06/15/17)

Barley thrips were observed in 55% of the fields surveyed by the IPM Scouts throughout the state, and ranged from 0-18 thrips per stems.

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Sugarbeet Root Maggot Alert: High Fly Activity Expected During Next Five Days (06/08/17)

Recent periods of hot weather have accelerated the accumulation of root maggot growing degree day (DD) units.

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Watch Field Edges for Grasshoppers (06/08/17)

Hot and droughty weather is favorable for grasshoppers! So, it is important to watch grasshopper nymphs (young grasshoppers) that are active in field ditches and starting to move into field edges.

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