Wisconsin Crop Manager newsletter

Author:	WCM Staff	Created:	4/21/2006 11:13 AM
Weed woes

Hill Mustard, an invasive mustard on the move in Southwestern Wisconsin

By WCM Staff on 5/24/2007 11:26 AM

A new invasive mustard called Hill mustard has recently been observed spreading throughout the southern part of the state.

Labelled Stages for Postemergence Herbicides in Corn

By WCM Staff on 5/23/2007 3:58 PM

In regards to postemergence herbicides in corn, I think these three simple rules capture most of what needs to be said.

Early-Season Weeds in Corn

By WCM Staff on 5/23/2007 1:05 PM

Postemergence herbicide programs in corn should make growers and agronomists think hard about the question of “When does weed competition start to affect corn yield potential?” A few bushels lost to weed competition can easily result in a $10/a or $15/a loss or more.

Is it the Bugs in Common Lambsquarters?

By WCM Staff on 5/17/2007 11:51 AM

The overall conclusions of studies in Michigan and Indiana were that tunneling by the leaf-miner larvae did not affect the level of lambsquarters control by glyphosate. Even when the beet petiole borer was present and tunneling, control of 10-inch tall lambsquarters was still greater than 90%. Thus, insect tunneling was not contributing to lambsquarters control problems with glyphosate, but the researchers had more difficulty controlling larger lambsquarters than smaller plants.

Scout Pre-Treated Corn Fields

By WCM Staff on 5/17/2007 11:49 AM

Many fields in Wisconsin received a welcomed rain for activating preemergence herbicides in the past couple days. Still, questions may remain if the rain came soon enough to activate these preemergence herbicides before weeds had started to emerge.

Off to a clean start: early season weed management for vegetable growers

By WCM Staff on 5/10/2007 3:04 PM

Spring is a time to enjoy lush new green growth and a new beginning that will hopefully lead to a bountiful summer harvest. Unfortunately, the weeds in your vegetable garden are also enjoying the abundant sunshine and soil moisture. However, there are a few weed management strategies that can be implemented in the early season that will reduce the hours of hand-weeding and hoeing later in the growing season. The old saying “an ounce of prevention is worth a pound of cure” holds true in the case of weeds.

District Judge’s Final Decision on Roundup Ready Alfalfa

By WCM Staff on 5/10/2007 2:52 PM

After hearing additional testimony and reviewing additional data, the judge made his final ruling with regards to the use of Roundup Ready alfalfa. This past Thursday (May 3rd, 2007). The judge ruled that Roundup Ready alfalfa seed will continue to be a regulated commodity (has been regulated since the initial injunction on 3-12-07) and no new Roundup Ready alfalfa stands can be planted.

Corn Herbicide Injury

By WCM Staff on 5/10/2007 2:27 PM

Corn is or will be emerging soon now. If there are any problems with corn emergence, herbicides may be blamed as the cause. However, herbicides may or may not be the culprit. A few points should be remembered if you encounter any emergence problems.

White Cockle Questions

By WCM Staff on 5/2/2007 2:32 PM

White cockle is a persistent weed in hayfields and no-till corn and soybean fields and it seems to be an increasing problem based on recent questions. A few key points about white cockle are discussed, followed by some management comments.

Horseweed, Resistance, and Wind

By WCM Staff on 4/25/2007 12:14 PM

Horseweed (or marestail) is the most widely distributed glyphosate-resistant weed in the U.S. After the initial confirmation in Delaware in 2001, glyphosate-resistant (GR) horseweed has been reported 15 states, including Illinois to our south and Nebraska to our southwest. The potential for horseweed seed to move from one farm to another or even from one county to another is an interesting question.