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Advanced Armyworm and Outbreak Pockets in Western Wisconsin
Wisconsin Crop Manager Insects and Mites By WCM Staff on 7/28/2005 12:31 PM
Corn fields in western and west central Wisconsin are exhibiting advanced armyworm larval stages and extreme corn leaf feeding to the midrib. Some of the reports, as detailed below, are related to grassy weed presence and/or later than optimal grassy weed control. However, more extensive field areas are being defoliated due to heavy populations, independent of weed management issues.
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Spider Mites – Threshold Overview, Effects of Rain
Wisconsin Crop Manager Insects and Mites By WCM Staff on 7/28/2005 12:08 PM
Spider mites continue to be present on soybeans in Wisconsin. The main questions coming in by phone and at field days over the last week are “What is the threshold for two-spotted spider mite?” and “How will the recent strong storms affect mite populations?”.
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Critical to Watch Soybean Aphids as Temperatures Cool
Wisconsin Crop Manager Insects and Mites By WCM Staff on 7/28/2005 11:22 AM
As reported in the July 21st issue of Wisconsin Crop Manager, soybean aphids continue to warrant close monitoring. By mid-July fields exceeded threshold in many southern WI counties and received timely insecticide application based on populations in excess of 250 aphids per plant average.
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Research Brief: 0 to 3 Node-Injury Scale for Corn Rootworm Rating
Wisconsin Crop Manager Insects and Mites By WCM Staff on 7/7/2005 2:03 PM
A recent article published in the February 2005 issue of Journal of Economic Entomology titled “Node-Injury Scale to Evaluate Root Injury by Corn Rootworms (Coleoptera: Chrysomelidae)” (Oleson et al. 2005) provides new and improved guidance for the annual corn root rating task.
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Time Approaching to Evaluate Corn Roots for Injury by Corn Rootworms
Wisconsin Crop Manager Insects and Mites By WCM Staff on 7/7/2005 12:57 PM
Over the next couple of weeks of July, we enter the crop season window during which to evaluate corn root injury by corn rootworms. We are planning to dig roots, soak and then wash the soil away with a high pressure hose stream, and quantify root injury in our UW Madison Entomology research trials, insecticide efficacy program, and on-farm studies between the dates of July 18th and July 25th.
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Soybean Aphids and High Temperatures
Wisconsin Crop Manager Insects and Mites By WCM Staff on 6/23/2005 12:44 PM
Much of Wisconsin is forecasted to experience high temperatures. As we are all in the field experiencing temperatures in the upper 80s and approaching 90s or higher heat index ratings, how will this affect population growth of the soybean aphid?
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Guest Article Feature: Planning for the 2005 Soybean Aphid Population
Wisconsin Crop Manager Insects and Mites By WCM Staff on 5/26/2005 1:30 PM
With soybean planting well underway for 2005 there is a lot of concern about potential pest problems, both rust and aphids this year. Following a year in which the soybean aphid was widely distributed in the Midwest but rarely common enough to generate concern, the question is what about 2005?
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Field Reports: Dingy Cutworm in Corn, Look for Black Cutworm Cutting
Wisconsin Crop Manager Insects and Mites By WCM Staff on 5/26/2005 1:21 PM
Several reports have come in this week on Dingy cutworm larvae in seedling corn fields. Several reports have come in this week on Dingy cutworm larvae in seedling corn fields. These corn fields are just emerging, or up to the first true leaf stage. Common to all these consultant calls is that the fields of concern are of sandy soil type.
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Mower-conditioner Adjustments for Rapid Forage Drying in the Field
Wisconsin Crop Manager Equipment By WCM Staff on 5/25/2005 9:00 PM
Two types of conditioning systems used on mower-conditioners are rolls and impeller. The conditioning roll clearance and pressure must be adjusted to insure the stems are cracked which increases the drying rate of the stems.
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Change in Yield and Quality of Alfalfa
Wisconsin Crop Manager Crops By WCM Staff on 5/25/2005 9:00 PM
Many growers are asking about the tradeoffs in yield and quality as they enter quality pricing contracts for hay or haylage. The situation is that premiums are paid for quality but some of the higher price for increased forage quality is offset by lower yields of fields cut earlier for the higher quality.
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What kind of Bean Leaf Beetle Activity are we expecting as Soybean Seedlings Emerge?
Wisconsin Crop Manager Insects and Mites By WCM Staff on 5/19/2005 3:20 PM
Depending on temperature, peak activity for overwintered bean leaf beetle will continue throughout the month of May. A window of vulnerability exists for early planted (late April to early May) soybeans. Field scouting is critical for the rest of May as seedling soybeans are present at the same time overwintered bean leaf beetles are feeding and laying eggs.
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Frost Damage to Alfalfa
Wisconsin Crop Manager Crops By WCM Staff on 5/3/2005 8:00 PM
The cold temperatures during the last week of April have caused some frost damage to alfalfa. Following are recommendations for evaluating damage and taking action.
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Prepare to Monitor Alfalfa Stands for Alfalfa Weevil Larvae
Wisconsin Crop Manager Insects and Mites By WCM Staff on 4/28/2005 11:10 AM
Alfalfa weevils overwinter as adults, becoming active with the first warm days of spring in which they migrate from plant debris, woodlots, ditchbanks, etc. into alfalfa stands to lay eggs. Most eggs are deposited in stems of the growing alfalfa. By using degree days (accumulated above a base 48F), growers and crop advisors can monitor fields for alfalfa weevil activity.
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Stewart’s Wilt outlook in WI corn for 2005 – and ID tips on springtail versus corn flea beetle
Wisconsin Crop Manager Insects and Mites By WCM Staff on 4/21/2005 4:01 PM
Corn flea beetle can vector Stewart’s bacterial wilt of corn, and is of concern in susceptible sweet corn varieties and susceptible dent corn inbred seed production fields if 1) corn flea beetles have a high overwintering survival rate 2) Stewart’s wilt bacteria is available for the corn flea beetle to pick up and spread.
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Regulatory Brief: Sandhill CraneHerbivory on Young Corn Plants
Wisconsin Crop Manager Insects and Mites By WCM Staff on 4/14/2005 3:07 PM
Although not in the insect management category, I have talked with several consultants and growers who have asked about the status of corn seed chemical treatment options that may be registered in the near term to deter greater sandhill crane (Grus Canadensis tabida) feeding on field corn between the planting and early seedling stages.
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Research Brief: Soybean Aphid and Soil Potassium Availability
Wisconsin Crop Manager Insects and Mites By WCM Staff on 4/7/2005 3:13 PM
Results of research conducted by University of Wisconsin, Madison entomologists and a soil scientist on the “Effect of soil potassium availability on soybean aphid population dynamics and soybean yield” were published in the February 2005 issue of the Journal of Economic Entomology.
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Bean Pod Mottle Virus – A No-Show in Wisconsin Soybeans in 2004
Wisconsin Crop Manager Insects and Mites By WCM Staff on 1/17/2005 5:28 PM
The late season 2004 BPMV analyses are complete and the season ended as it began, with minimal detection of BPMV in bean leaf beetles collected in spring alfalfa fields followed by no positive detections of BPMV in late season soybean plants throughout the state.
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