Wisconsin Crop Manager newsletter

Author:	WCM Staff	Created:	4/21/2006 12:13 PM
Whats bugging you. Articles concerning insects on field crops in Wisconsin

Soybean Aphids and High Temperatures

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?

Guest Article Feature: Planning for the 2005 Soybean Aphid Population

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?

Field Reports: Dingy Cutworm in Corn, Look for Black Cutworm Cutting

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.

What kind of Bean Leaf Beetle Activity are we expecting as Soybean Seedlings Emerge?

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.

Prepare to Monitor Alfalfa Stands for Alfalfa Weevil Larvae

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.

Stewart’s Wilt outlook in WI corn for 2005 – and ID tips on springtail versus corn flea beetle

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.

Regulatory Brief: Sandhill CraneHerbivory on Young Corn Plants

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.

Research Brief: Soybean Aphid and Soil Potassium Availability

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.

Bean Pod Mottle Virus – A No-Show in Wisconsin Soybeans in 2004

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.