Insect Management

Soybean defoliation levels
Figure 1. Levels of soybean defoliation. Impact of losing leaf area depends on growth stage.

Soybean Defoliation Worksheet July 13, 2016

While soybean defoliation, the most common injury to soybeans from insects, can look devastating, soybean plants can often compensate for the leaf loss. When making pest-management decisions, crucial considerations are the size of the remaining leaf canopy and the soybeans' growth stage.

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Western bean cutworm feeding in corn
Western bean cutworm feeding in corn

Begin Scouting for Western Bean Cutworm Eggs in Corn July 8, 2016

The first western bean cutworm moths were captured in University of Nebraska-Lincoln black light traps June 23 at Clay Center, June 27 at North Platte, and June 30 at Scottsbluff. Flights are currently increasing, particularly in North Platte. Scouting should be underway across much of the state.

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Western corn rootworm
Figure 1. Western corn rootworm

Scout for Emerging Western Corn Rootworm Beetles July 5, 2016

Western corn rootworm beetles began emerging in southeast and south central Nebraska during the last week in June. Beetles typically emerge somewhat later in northeastern and western Nebraska. Scouting should be underway to determine field presence and possible need for treatment.

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Japanese beetle
Japanese beetle

Japanese Beetles Emerging; Identification Key to Management July 1, 2016

Japanese beetle adults are beginning to emerge in eastern Nebraska and have been reported feeding in corn and soybean. Here's how to differentiate them from the look-alike sand chafers and treatment thresholds to determine when treatment is recommended.

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Young grasshoppers in corn
Immature grasshoppers are being reported feeding in crop fields in eastern Nebraska. Treatment at early growth stages is most effective.

Scout Field Borders for Grasshoppers June 30, 2016

Populations of immature grasshoppers are being reported in areas bordering crop fields in several parts of eastern Nebraska. If these grasshopper species are one of the four major species that are likely to infest cropland, control may be warranted. Check here are scouting guide and treatment thresholds and recommendations.

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western bean cutworm
western bean cutworm

Using Degree-Days to Predict Western Bean Cutworm Flights June 24, 2016

Accumulated degree-days offer a proven means for estimating when to scout for insects, including the western bean cutworm. Here's how to estimate insect growth and recommended dates to start scouting for WBC at 14 Nebraska sites.

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First Generation European Corn Borer Scouting & Treatment June 14, 2016

Growers are noting shot-hole feeding from European corn borer in non-Bt corn. Nebraska Extension offers several resources to monitor moth activity and determine when treatment is necessary.

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Map showing accumulated DD indicating scouting window for common stalk borer

Predicting Stalk Borer Development in Corn June 13, 2016

Based on accumulated degree days, scouting should be underway across the state for common stalk borer in corn.

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