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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Soybean roots with smaller soybean cyst nematode (SCN) cysts (red arrows) and larger nitrogen nodules (blue arrows).
Soybean roots with smaller soybean cyst nematode (SCN) cysts (red arrows) and larger nitrogen nodules (blue arrows).

SCN Scouting Recommendation Changes; SCN Resistance Possible July 8, 2016

Mid-summer is an effective time to scout for soybean cyst nematode (SCN) using either the visual or soil test method. This story describes both methods. If SCN is identified, a follow-up soil test approximately six years later can help assess effectiveness of treatment efforts as well as identify SCN resistance.

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UNL Soybean Management Calendar SoyCal
UNL Soybean Management Calendar SoyCal

Check SoyCal for Timely Soybean Pest & Management Info July 8, 2016

UNL's Soybean Management Calendar -- SoyCal -- offers location-based, timely information to guide your field scouting and pest identification efforts.

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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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Corn leaf rolling
Figure 1. One indicator of heat stress is when corn leaves roll in the early morning in areas where there is adequate soil moisture.

Impacts of Extreme Heat Stress and Increased Soil Temperature on Plant Growth and Development June 21, 2016

Both corn and soybean are susceptible to extreme heat (and water) stress during early vegetative stages as well as later critical growth stages (pollination for corn and flowering for soybean). Extreme heat stress can reduce plant photosynthetic and transpiration efficiencies and negatively impact plant root development, which collectively can negatively impact yield. The author recommends that during an extended heat wave (air temperature equal to or greater than 90 F for 7-10 days), applying 0.25-0.40 inch of water can be very beneficial.

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Soybean seedling damage
Soybean seedling damage

Herbicide Injury and Pathogen Infection on Soybean Seedlings June 17, 2016

In an ongoing survey for soilborne pathogens in soybeans, closer examination of soybean seedling injury in a Keith County field found several causes, including herbicide injury and damping off from Fusarium or Rhizoctonia root rot.

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3 top tps for delayed soybean planting
3 top tps for delayed soybean planting

Adjusting for Delayed Soybean Planting May 27, 2016

As wet conditions further delay soybean planting in some areas, learn what practices may need to be adjusted and which don't to achieve a successful soybean stand.

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Corn seedlings in flooded field
Figure 1. Corn seedlings growing in flooded field.

How Saturated Soils Affect Germination, Seedling Growth May 12, 2016

Similar to last year’s heavy rains in early May, rain on May 9 and May 10-11 in portions of Nebraska have caused ponding and flooding across some fields.  As of Sunday, May 8, USDA-NASS reported that 57% of Nebraska's corn was planted that is behind the 71% planting progress in 2015 but close to the

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