Corn Insects

Avoiding Injury from Seed Corn Maggot April 26, 2019

A new pest management resource for the seed corn maggot predicts fly development based on accumulated growing degree days. A new map, updated daily, shows degree days at multiple sites.

Figure 1. Nebraska's Joe Louis with a collection of leaves infested by corn-leaf aphids. Louis and his colleagues have found that spraying a corn plant with one of its own defensive compounds might reduce aphid colonization by as much as 30%. (Photo by Craig Chandler, University Communication)

Experiments Underscore Overlooked Aspect of Defending Corn from Pest March 4, 2019

Spraying a corn plant with one of its own compounds — 12-oxo-phytodienoic acid, or OPDA — can help deter the virus-carrying, pollination-disrupting insect known as the corn-leaf aphid.

The Biology and Management of Ear-Feeding Lepidopteran Pests of Corn in Nebraska January 9, 2019

A guide to Identification and management of European corn borer (Ostrinia nubilalis), western bean cutworm (Striacosta albicosta), corn earworm (Helicoverpa zea), and fall armyworm (Spodoptera frugiperda).

Western corn rootworm beetles feeding on a corn leaf — Figure 1. Damage to corn leaf caused by western corn rootworn. (Photo by Robert Wright)

Western Corn Rootworm Beetles Emerging, Time to Scout June 27, 2018

Corn rootworm beetles started emerging in southeast and south central Nebraska and scouting is recommended. An average of 5-10 beetles per ear usually can seriously affect pollination.

Figure 1. Japanese beetles will first feed on the leaves of soybean (left) or corn. In corn they'll move to the silks (right) when they become available. (Photos by Justin McMechan) — Figure 1. Japanese beetles will first feed on the leaves of soybean (left) and corn. In corn they'll move to the silks (right) when they become available. (Photos by Justin McMechan)

Scout Corn and Soybean for Japanese Beetles June 25, 2018

Japanese beetles are emerging in eastern Nebraska and will continue to emerge for the next couple of weeks. As numbers will be highest in field margins, growers are advised to scout across the whole field before determining the need for treatment.

Using Degree-Day Models to Predict Western Bean Cutworm Flights June 21, 2018

By using a degree-day model, growers can account for the effect of temperature on insect development and approximate when certain insect stages will occur. See predicted cutworm flights and recommended scouting periods for 14 Nebraska locations.

Figure 1. Seasonal ecology of wheat stem maggot (Allen 1933) overlaid on 2017 field issues. Arrows indicate likely source of infestation started with adult movement in the spring.

Wheat Stem Maggot Adult Monitoring: A Pest of Cover Crop-to-Corn Transitions April 25, 2018

This article looks at wheat stem maggots in cover crops-to-corn transitions, including their biology, risk for damage to early season corn, and what to look for this spring.

First portion of the Handy Bt Trait Table

Handy Bt Trait Table Updated for 2018 Corn January 31, 2018

The Handy Bt Trait Table, which lists the types of Bt hybrids present for all commercialized corn, has been updated for 2018. Now in its 15th year, the table has become the standard authoritative reference to Bt toxins in corn.