Site-specific herbicide applications based on weed maps provide effective control

More-effective weed control in agricultural fields can be achieved by utilizing information about the spatial distribution of the previous year’s mature weeds. In our study, variable-rate herbicide applications based on weed infestation maps developed just before the previous year’s harvest provided effective weed control. The results showed that when information about the spatial distribution of the previous year’s weed seedlings or mature weeds was used, weed control was comparable to uniform, one-rate, herbicide applications, while the total amount of herbicide applied decreased. Herbicide use was reduced an estimated 39% for the seedling map and 24% for the mature map approach. However, incorporating the weed-seed redistribution from harvest to application time into the treatment maps could further improve weed control

Preemergence herbicides have little effect on vigor of perennial grasses

Perennial grass stands often face stiff competition from weeds, particularly during the first few years after grass establishment. Field studies were conducted to evaluate the tolerance of several established perennial grasses to preemergence herbicides in order to selectively suppress weeds. Grass vigor was reduced by some herbicides, but most had minimal effects. The herbicides that controlled weeds best also caused the greatest reduction in grass vigor

In low-input and organic systems: Researchers find short-term insect problems, long-term weed problems

The conversion from conventional to low-input or organic crop production requires changes in pest control tactics. In a 5-year study, abundance of most pests did not change dramatically between conventional and low-input or organically managed systems, with a few notable exceptions. Organic and low-input plots suffered significantly greater damage from tomato fruitworm in 1989 and stink bugs in 1992. The major long-term effect has been on weeds. Weed control methods differ among the systems and have resulted in more barnyardgrass in low-input and organic systems and field bindweed and nightshade in conventional systems

Avoiding Weed Shifts and Weed Resistance in Roundup Ready Alfalfa Systems

Glyphosate-resistant alfalfa can reduce weed-control costs and potentially improve the quality of your harvested crop. Learn the proper management steps you need to take to help prevent weed shifts and herbicide resistant weeds when planting glyphosate-resistant alfalfa

Weed Management for Organic Crops

Weed management in organic vegetable production systems must involve the use of many techniques and strategies, all with the goal of achieving economically acceptable weed control and crop yields

Weed Management for Organic Crops

Weed management in organic vegetable production systems must involve the use of many techniques and strategies, all with the goal of achieving economically acceptable weed control and crop yields