Crop & Pest Report




Soybean Aphids Continues to be Low (08/18/16)

In North Dakota, soybean aphid continues to be sub-economic.

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Corn Rootworms Emerging (08/18/16)

Northern corn rootworm beetles have been emerging the last two weeks.

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Flea Beetles Causing Feeding Injury to Canola Pods (08/04/16)

The new generation of adult flea beetles emerges after mid-July and feeds on the green foliage and developing green pods of canola.

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Grasshoppers Increasing out West (08/04/16)

Adult grasshoppers are starting to move into rows crops, such as flax, field corn and sunflowers, as the cereal grains are starting to dry down and be harvested, and ditches are hayed.

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Insecticide Update (08/04/16)

Updates on Zeal SC miticide, Agri Mek SC miticide, and Force 3G.

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Sunflower Insect Update (08/04/16)

Continue to scout for red sunflower seed weevils, and banded sunflower moths/sunflower moths in sunflowers until fields reach the R5.7 crop stage (70% of the head area has completed or is flowering).

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Mystery Insect (07/28/16)

This week’s mystery insect is a giant ichneumonid wasp called Megarhyssa atrata.

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Scouting Tips for Red Sunflower Seed Weevil (07/28/16)

The USDA NASS reports that 22% of the sunflowers were blooming in North Dakota (USDA NASS News Release – July 25, 2016).

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Sunflower Insect Traps (07/28/16)

Pheromone trap catches continue to show high numbers of banded sunflower moths and sunflower moths located in southeast and north central North Dakota (see maps below).

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Soybean Aphid Continues to be Low (07/28/16)

About 135 fields were scouted by the NDSU and UMN Crop IPM Scouts for soybean aphids the last two weeks.

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Alfalfa Webworm in Soybeans and Sunflowers (07/28/16)

Alfalfa webworm larvae (worms) have been observed causing foliar defoliation in soybeans and sunflower, mainly in the north central area of North Dakota. Some of the field reports include Makoti, Minot, Mohall and Max.

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Protect Bees from Pesticide Poisoning (07/21/16)

If you need to spray flowering sunflowers or other flowering field crops, please remember to PROTECT BEES by notifying bee keepers before an insecticide application.

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Red Sunflower Seed Weevil Threshold for 2016 (07/21/16)

I’ve updated this scouting article on red sunflower seed weevil (RSSW) from last year’s Crop & Pest Report.

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Sunflower Insect Traps (07/21/16)

Pheromone traps run by the IPM Survey scouts showed higher numbers of banded sunflower moths located in southeast and north central North Dakota and increasing numbers of sunflower moths in north central North Dakota.

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Soybean Aphids - IPM Scouting Reports (07/21/16)

Over 100 fields were scouted by the IPM Scouts for soybean aphids the last two weeks.

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Soybean Aphid Economic Threshold (07/21/16)

I have received questions about the soybean aphid economic threshold, and some have suggested that the threshold be lowered.

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Sunflower Insect Trap Update (07/14/16)

The sunflower moth migrates into ND each year from the south.

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Wheat Midge Trapping (07/14/16)

The wheat midge pheromone trap monitoring network using the PestWeb system (Montana State University) indicates that numbers of wheat midge increased slightly; however, most traps sites are considered low.

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Scout for Banded Sunflower Moth (07/14/16)

Banded sunflower moths usually emerge from the soil about mid-July.

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Armyworm Damage in Wheat (07/07/16)

Field reports of armyworm damaging wheat occurred in Barnes and Ransom counties.

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