Corn Insects

western bean cutworm moth

Scouting and Treatment Recommendations for Western Bean Cutworm

July 8, 2020
The first western bean cutworm moths were captured in University of Nebraska-Lincoln black light traps June 23 at North Platte, June 26 at Clay Center, and July 7 at Scottsbluff.

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Western corn rootworm beetle feeding on a leaf of corn

Western Corn Rootworm Beetles Emerging, Time to Scout

July 7, 2020
Western corn rootworm beetles began emerging in southeast and south central Nebraska at the end of June. Beetles emerge somewhat later in northeastern and western Nebraska.

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ECB adult female

Light Trap Data Available Online

June 18, 2020
UNL Extension Entomology is monitoring crop insect pests (primarily moths) using black light traps at university facilities at North Platte, Clay Center, Mead, and Concord.

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western bean cutworm larvae

Western Bean Cutworm Flight Predictions for 2020

June 17, 2020
The growth stage of corn during WBC flight is critical as moths prefer to lay their eggs on corn plants between the late whorl to early tassel stage. Survival of young WBC larvae is highest if they can feed on newly emerged tassel prior to moving into the ears.

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Seed corn maggots
Seed corn maggots

Avoiding Injury from Seed Corn Maggot

May 20, 2020
We have received several reports of injury from seed corn maggot that has reduced stands of Nebraska soybeans. Learn why they may have been more problematic this year.

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CW Podcast: Late-Maturing Crops and Insects

September 13, 2019
In this month’s CropWatch Podcast Extension Educator Michael Sindelar is joined by entomologist Robert Wright to discuss insect issues in late maturing corn and soybeans.

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Crop progress and conditions for corn from the USDA National Agricultural Statistics Service indicating predicted timing for corn growth stages (2019).

Using Degree-Day Models to Predict Western Bean Cutworm Flights

June 21, 2019
With late planting, slow emergence, and cooler summer temperatures affecting corn development, will corn be spared from western bean cutworm damage in 2019. Unfortunately, models indicate WBC growth is also delayed. See a table of predicted dates for 2019 WBC flights in Nebraska and surrounding states.

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Example of bioassay used for monitoring ECB susceptibility to Bt protein

First ECB Resistance to Bt Corn Reported in Canada

May 22, 2019
The first case of field-evolved resistance of European corn borer (ECB) to Bt transgenic corn has been reported in Canada. What does this mean for Nebraska corn farmers and how can they help maintain resistance here?

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