Keith Jarvi - Extension Educator

Keith Jarvi

faculty
Work
57905 866 Rd Concord NE 68728-2828
US
Work 402-584-3819 On campus, dial 7-3819

Location: Dixon, Wayne, Cedar and Knox Counties
Focus Area: Crops - Integrated Pest Management
Issue Team Co-Leader: Adopting Management Strategies to Deal with Resistant and Invasive Pests
Focus Resources: CropWatch.unl.edu, Water.unl.edu

Soybean aphid speed scouting app
Soybean aphid speed scouting app

Soybean Aphid Scouting and Management

July 28, 2016

The current recommended economic threshold for late vegetative through R5 stage soybeans is 250 aphids per plant with 80% of the plants infested and populations increasing. Depending on economic conditions, this generally gives you about five to seven days to schedule treatment before populations reach economically damaging levels.

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Soybean aphid
Soybean aphid

Decision Making for Soybean Defoliating Insects

July 15, 2016
July is when growers start to see a variety of defoliators in Nebraska soybean fields. It's easy to overestimate the amount of defoliation and soybean plants can compensate for some leaf area loss. This article describes how to assess defoliation and provides basic treatment thresholds.

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Insect Moth Trap Counts - May 6

May 6, 2016

Moth traps have been established at 12 sites in northeast, east central, southeast and south central Nebraska to monitor flights of armyworm, black cutworm, and variegated cutworm moths.  The results are presented below and will be updated weekly through May.

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alfalfa weevil
Alfalfa weevils can cause serious yield loss in first cutting alfalfa

Scout for Alfalfa and Clover Leaf Weevils

May 5, 2016
Guide to identifying and managing alfalfa and clover leaf weevils in alfalfa. While research in northeast Nebraska has shown that clover leaf weevil larva feeding does not cause yield reduction to first cutting alfalfa, alfalfa weevil feeding can cause severe losses to yield and quality of the first cutting. This is why it's important to correctly identify the type of weevil feeding causing damage.

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Table of variegated cutworm moth counts for April 1-28, 2016
Variegated cutworm moth counts

Insect Moth Trap Counts - 2016

April 28, 2016

Moth traps have been established at 12 sites in northeast, east central, southeast and south central Nebraska to monitor flights of armyworm, black cutworm, and variegated cutworm moths.  The results are presented below and will be updated weekly through May.

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Photo of wireworms
Wireworms

Scout Emerging Corn for Insects; Don't Assume Protection

April 27, 2016
As corn begins to emerge, be alert to the potential for damage from early season insects such as cutworms, wireworms, or white grubs. High risk factors and identification and treatment guides for these major early season insects are included.

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Insect Pheromone Trap Reports 2016

Moth traps have been established at 12 sites in northeast, east central, southeast and south central Nebraska to monitor flights of armyworm, black cutworm, and variegated cutworm moths. Find weekly updates in CropWatch:

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