Crop & Pest Report

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Entomology

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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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Wheat Midge Trapping (07/07/16)

NDSU Extension Entomology is cooperating with Montana State University on the wheat midge pheromone trapping network using the PestWeb system.

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Wheat Midge Degree Days Update (07/07/16)

The current degree day map indicates that most (50-90%) of wheat midge females are emerging this week.

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Banded Sunflower Moth Emerging (07/07/16)

Pheromone traps ran by the NDSU Extension IPM scouts have trapped low numbers (<14 moths per trap per week) of banded sunflower moth in Cass, Barnes and Foster counties.

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Scout for Lygus Bugs in Pulse Crops (06/30/16)

Tarnished plant bug, Lygus lineolaris, is one of the more common species of Lygus bugs and is known to feed on over 385 crops and weed plants.

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Leafy Spurge Flea Beetles - DD Update (06/30/16)

Accumulated growing degree days (AGDD) from NDAWN (sunflower degree days/growth stage application) indicated that we are at optimal time to collected flea beetles between 1,200 and 1,600 AGDD.

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Wheat Midge Degree Days Update (06/30/16)

The current degree day map indicates that 10-50% of wheat midge females are emerging.

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Time to Scout for Soybean Aphids (06/30/16)

Over 100 soybean fields were surveyed by the IPM Survey scouts last two weeks in ND and MN (Source: P. Glogoza for MN).

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