Managing Resistant and Other Difficult to Control Weeds

Currently, weed control is practiced to a very intensive level of management in the Midwest. Most all acres of com and soybean production are treated with one or more herbicides, and often with multiple applications of herbicides. And yet weed problems remain that cause concern to the grower, in some instances because of potential losses due to competition and harvest losses, and in other instances because of grower, landlord, and neighbor expectations for near perfect control of all weedy species in growing crops. Some of these greater expectations come as a result of product guarantees and respray programs, which are sometimes implemented when no significant problem really exists

Pigweeds of the Midwest- Distribution, Importance and Management

A number of pigweed species can be found throughout the Midwest, but we are most concerned about those species that are commonly found in cropping situations. The most common weedy pigweeds can be separated into three distinct groups according to their taxonomic characteristics and overall appearance. The first group includes some of the most common pigweeds in the Midwest: redroot pigweed (Amaranthus retroflexus), smooth pigweed (Amaranthus hybridus) and Powell amaranth (Amaranthus powellii)

2002: Annual Disease Nursery Report

unpublishednot peer reviewe