Crop & Pest Report

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Entomology

5.ent.knodel.fly

Hessian Fly Damaged Wheat (08/13/15)

Several emails and calls about lodged wheat from Hessian fly infestations have been reported in primarily Pembina and Williams counties.

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2.ent.knodel.aphid map 1

Soybean Aphids & Hot Temperatures (08/13/15)

Soybean aphids increased with the favorable temperatures in the low 80s F last week. However, the recent hot weather (>90 F), will slow population growth.

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1.ent.knodel.butterfly

White Butterflies Flying Around (08/13/15)

I’ve received many calls and emails about all of the white butterflies flying around ditches, canola, alfalfa and other areas and whether they are an insect pest.

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ent.knodel.8.corn rootworm

Adult Corn Rootworms Emerging (08/06/15)

Northern and western corn rootworm adults were observed in field corn near Page, northern Cass County. The adult northern corn rootworm is green beetle and about ¼ inch long.

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ent.knodel.7.sunflower moth.1

Sunflower Insect Traps (08/06/15)

Banded sunflower moth peaked last week with our highest trap numbers recorded yet for the season. Sunflower moth also increased, but numbers are still below the economic threshold for traps.

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ent.knodel.6.rove beetle

Good Bug Corner – Rove Beetles (08/06/15)

This week’s Good Bug Corner featured insects are the Rove Beetles in the insect family Staphylinidae.

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ent.knodel.Corn Aphids Average Plant.1

Corn Aphids (08/06/15)

High populations of aphids are being observed in field corn in the east-central areas of North Dakota (NDSU Corn IPM Survey).

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ent.knodel.3.soybean aphid map.1

Soybean Aphids - IPM UpdateSoybean Aphids - IPM Update (08/06/15)

Ninety-seven fields were scouted by the IPM Scouts for soybean aphids last week. The IPM scouts in North Dakota and Minnesota found soybean aphids in 57% of the soybean fields surveyed.

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ent.knodel.1.thrips

Canola – Flower Thrips (08/06/15)

Flower thrips are being observed in canola.

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ent.knodel.6.sunflower head

Insecticide Control of Sunflower Head Insects (07/30/15)

I’ve updated this article on timing of insecticide application for management of sunflower head insects from an old issue of the 2013 Crop & Pest Report.

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ent.knodel.4.red sunflower seed weevil

Red Sunflower Seed Weevil Threshold for 2015 (07/30/15)

Red sunflower seed weevil (RSSW) adults are emerging now and will fly to the nearest flowering sunflowers.

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ent.knodel.3.banded sunflower moth maps

Sunflower Insect Traps (07/30/15)

Pheromone traps run by the IPM Survey scouts showed high numbers of banded sunflower moths located in southwest and central North Dakota and increasing numbers of sunflower moths in north central and northeast North Dakota (see maps).

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ent.knodel.2.soybean aphid maps

Soybean Aphids - IPM Scouting Update (07/30/15)

Eighty-eight fields were scouted by the IPM Scouts for soybean aphids last week. The IPM scouts in North Dakota and Minnesota found soybean aphids in 60% of the soybean fields surveyed.

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ent.knodel.1.butterfly

Good Bug Corner-Monarch Butterfly (07/30/15)

This week’s Good Bug Corner featured insects are the Monarch butterfly in the insect family Nymphalidae.

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ent.knodel.2.aphid maps

Soybean Aphids - Scouting Critical (07/23/15)

Some “hotspots” soybean fields are at economic threshold (E.T. = average of 250 aphids per plant, 80% of the plants infested, and increasing populations) and will be or have been sprayed with insecticide for soybean aphid control.

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ent.knodel.3.sunflower moth maps

Update on Sunflower Insect Pests (07/23/15)

Pheromone traps monitored by the IPM Survey scouts are capturing increasing numbers of banded sunflower moths (BSM) located in Cass and Foster Counties of North Dakota last week

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ent.knodel.1

Good Bug Corner-Parasitic Wasps (07/23/15)

This week’s Good Bug Corner featured insects are parasitic wasps in the insect family Braconidae.

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ent.knodel.3.soybean aphid maps

Soybean Aphids Increasing (07/16/15)

Continue scouting for soybean aphids during the R1 (early flowering) to R5 (early seed) crop stages. The IPM scouts in North Dakota and Minnesota found soybean aphids in 71% of the soybean fields surveyed during the time from June 29 to July 11.

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ent.knodel.2.ground beetle

Good Bug Corner-Ground Beetles (07/16/15)

This week’s Good Bug Corner featured insects are ground beetles in the family Carabidae.

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ent.knodel.1.pupae  sunflower seed maggot

Sunflower Seed Maggot (07/16/15)

Sunflower heads damaged from sunflower seed maggot, Neotephritis finalis, are being observed in some sunflower fields near Mandan.

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