Crop & Pest Report

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Entomology

ent.10.soybean aphids

2020 Soybean and Sunflower IPM Survey (09/24/20)

NDSU IPM field scouts surveyed a total of 563 soybean fields and 181 sunflower fields in North Dakota during 2020.

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2020 Small Grains IPM Survey (09/24/20)

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

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Grasshopper Feeding During Cool Temperatures (09/10/20)

Grasshoppers are cold-blooded organisms like all insects and require warm temperatures to feed and do other biological activities, such as egg laying. When the weather turns cold, overcast or rainy, grasshoppers need to warm up their body temperatures by basking in the sun for several hours during the morning before feeding.

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Gall Midges in Soybeans (09/10/20)

Some inquiries have come in concerning gall midges in soybeans over the past three weeks and whether it is the ‘soybean gall midge’ pest.

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Clean Grain Bins to Prevent Grain Insect Infestations (08/27/20)

The key to preventing grain insect problems in grain bins is deep cleaning empty grain bins and trucks hauling new grains.

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Flea Beetles Feeding on Canola Pods (08/13/20)

Late season feeding injury by flea beetles to canola pods is usually not economic or a pest concern in North Dakota.

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Continue to Scout for Red Sunflower Seed Weevils (08/13/20)

Be vigilant scouting for red sunflower seed weevils (RSSW) until sunflowers are passed R5.7 crop stage where they are no longer attractive to the female weevils for egg laying.

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Grasshoppers Increasing (08/13/20)

Grasshopper damage to wheat and other field crops is generally concentrated near field margins.

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Armyworms Marching West (08/06/20)

Large, mature armyworms are still being found on heads of 22% moisture wheat near Ross and stripping sunflower leaves and heads near Bowman. These armyworms are mature and almost done feeding. So, no insecticide application is warranted, since the cost of the insecticide and application is not likely to provide an economic return.

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Adult Corn Rootworms Emerging (08/06/20)

The first emergence of western corn rootworm was observed last week. The northern corn rootworm also is emerging. However, both species of corn rootworms are low so far. Continue to scout during corn pollination and see last week’s issue #14 NDSU Extension Crop & Pest Report for more information on scouting and E.T. for corn rootworms.

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Update on Sunflower Insect Trapping (08/06/20)

Trap catches for banded sunflower moth and Arthuri sunflower moths peaked at most sites this past week.

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Red Sunflower Seed Weevils Emerging (08/06/20)

Time to scout for red sunflower seed weevils (RSSW). IPM scouts are starting to see RSSWs on early blooming sunflowers in the southeast and south central areas of North Dakota. See the past issue #13 of NDSU Extension Crop & Pest Report for scouting and E.T. for RSSW.

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Soybean Gall Midge (07/30/20)

You have probably heard about the new soybean insect pest called soybean gall midge, Resseliella maxima. Currently, it has only been observed in five states including Minnesota, South Dakota, Iowa, Nebraska and Missouri (Map 1).

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Adult Corn Rootworm Emerging (07/30/20)

The first emergence of adult northern corn rootworm are being observed in corn fields near Sheldon, Ransom County and Barney, Richland County.

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European Corn Borer Trap Update (07/30/20)

Trap catches for the univoltine Z-race European corn borer (ECB) moth continue to decline for the second week in a row, with an average of 8 moths per trap per week compared to 9 moths per trap per week last week and 45 moths per trap per week 2 weeks ago (see trapping map).

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Grasshopper Update (07/30/20)

Be vigilant on scouting for grasshoppers.

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Mystery Insect (07/23/20)

What is wrong with these armyworms on wheat heads?

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European Corn Borer Update (07/23/20)

For the univoltine Z-race European corn borer (ECB) moth, traps catches declined, with an average of 9 moths per trap per week compared to 45 moths per trap per week last week (see trapping map).

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No Soybean Aphids (07/23/20)

Soybean aphids were killed by the recent, severe thunderstorms with strong winds and heavy rains moving west to east in North Dakota.

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Sunflower Insect Trap Update (07/23/20)

Banded sunflower moth (BSM) and Arthuri sunflower moth (ASM) trap catches increased significantly this past week.

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