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

Cut, Bale, Scout! - Potato Leafhopper management in Alfalfa

By WCM Staff on 7/19/2007 1:31 PM

Over the past few years some extension agents have reported a troubling trend. Alfalfa is cut, baled and then an insecticide is applied shortly after the bales have been removed. This is not a recommended practice for a variety of reasons. Scouting the field is the only way to know if PHL is present in populations large enough to cause damage to alfalfa regrowth, justifying an insecticide application.

Soybean Aphid Scouting and Management Recommendations 2007

By WCM Staff on 7/12/2007 3:13 PM

This article accompanies “Soybean Aphid Updates for Wisconsin – Important to Scout Fields” in this issue. Please visit the UW Madison Soybean Plant Health Web Page for more information on soybean aphid. Here are complete links.

Soybean Aphid Updates for Wisconsin – Important to Scout Fields

By WCM Staff on 7/12/2007 3:01 PM

Soybean aphid densities in commercial fields and UW Entomology research plots are summarized here from a variety of sources. Overall, field densities are low and have not reached economic threshold levels. A few scattered fields have reached threshold,

Corn Blotch Leafminer Reports from Dane County

By WCM Staff on 7/6/2007 12:06 PM

An occurrence of Corn Blotch Leafminer (CBL) was reported June 26 in Christiana Township (Dane County) by David Fischer, UW-Extension Dane County Crops and Soils Agent. The feeding was found on V12-V15 corn on the older, lower leaves, while the youngest, uppermost three leaves of each plant were found uninjured. Fischer also reported a large area of CBL feeding in the Black Earth area on June 28.

Red Admiral Butterfly

By WCM Staff on 6/28/2007 2:00 PM

Over the last couple of weeks, in southern Wisconsin at least (Dodge, Columbia, Dane Counties), conversation and questions have noted the large number of black and orange butterflies.

First Generation True Armyworm – Field and Sweet Corn, Small Grains and Pasture

By WCM Staff on 6/20/2007 2:35 PM

True Armyworm moth captures have increased in black light traps in Wisconsin over the past two weeks, and are high in neighboring states MN and IL.

First Generation European Corn Borer in Field Corn

By WCM Staff on 6/15/2007 9:44 AM

First generation European corn borer egg hatch has begun with confirmed feeding reports in corn plants in southern Wisconsin. Krista Hamilton, WI DATCP Pest Survey, reported egg hatch on June 8th. Please visit the Wisconsin Pest Bulletin corn section for this week’s statewide update http://pestbulletin.wi.gov/index.jsp.

Potato Leafhopper Populations in Alfalfa

By WCM Staff on 6/15/2007 9:32 AM

Potato leafhopper populations have increased over the last week, and nymph production is well underway. Many consultants and farmers have begun weekly sweep net sampling of alfalfa fields - this practice should continue for the remainder of the season. UPLOADTEMPLATE

Field Notes: Remember Insect Scouting on Alfalfa 2nd Crop Regrowth

By WCM Staff on 5/31/2007 12:59 PM

A reminder to watch 2nd crop alfalfa regrowth for remnant alfalfa weevil larvae and adults. UW-Extension Fond du Lac Crops/Soils Agent, Mike Rankin sent the featured pictures here on May 22nd. Mike reported significant alfalfa weevil larval feeding pressure along the east shore of Lake Winnebago.

Field Note: Soybean aphids detected on soybeans last week of May

By WCM Staff on 5/31/2007 12:57 PM

Soybean aphids have been detected on V1 soybeans. This is not unusual as we know soybean aphid egg hatch and initial generations occurred on the overwintering host buckthorn earlier this spring.

Bean Leaf Beetles are Active, Scout Emerging Soybeans

By WCM Staff on 5/24/2007 12:21 PM

Bean leaf beetles have begun to emerge in the region. Bean leaf beetles overwinter as adults beneath leaf litter. In early spring, adults feed on cultivated (alfalfa) and wild (e.g. showy tick trefoil) legumes. As soybean seedlings emerge, beetles move into soybean fields to continue feeding and lay eggs.

First Crop Alfalfa Alert: Threshold Alfalfa Weevil Populations Reported

By WCM Staff on 5/17/2007 1:30 PM

Alfalfa weevil larval hatch occurred on schedule over the first two weeks of May, in areas of Wisconsin that have reached and exceeded the 300 alfalfa weevil degree-days (base 48F) necessary for egg hatch. Reports have come to me between Thursday May 10th and Wednesday May 16th from southeastern, southwestern and western Wisconsin.

Soybean Aphid Biological Control … An Exotic Approach

By WCM Staff on 5/17/2007 1:22 PM

This season marks the 7th year since the discovery of soybean aphid in North America. This year also marks the first introduction of an exotic natural enemy against soybean aphid.

Black Cutworm: Monitor Corn Emergence and Evaluate Stand

By WCM Staff on 5/10/2007 4:00 PM

This is a routine reminder that black cutworm moth flights are underway, to expect larval development during the rest of May and in to June (depending on temperatures), and remember to monitor corn stands from seedling emergence through V5 growth stage.