Weeds

Wild parsnip (Pastinaca sativa) is an herbaceous, biennial, or short-lived perennial weed in North America native to Eurasia. The species produces furanocoumarins in the sap, stems, and leaves that cause severe burns (phytophotodermatitis) and blisters wh...

Dyer's woad (Isatis tinctoria) was introduced into Utah during the mid-19th century as a source of indigo dye. The plant escaped cultivation and has spread across rangelands, foothills, and other sites throughout the Intermountain West.

Scotch thistle (Onopordum acanthium) is an invasive species native to Eurasia. It was likely introduced into North America during the late 19th century (Young & Evans, 1969). Due to the plant’s size and prickles, a stand can damage pasture productivity, r...

If sprayers are not properly calibrated, it can result in over or under-application of chemicals, causing damage, reduced pest control, and potential safety concerns. Making the effort to properly mix chemicals and calibrate sprayers can save money and in...

Dr. Corey Ransom, Utah State University, discusses weed identification, weed management, and resistance management.

Using straw mulch for weed suppression in small-scale agriculture is a common and effective practice. Straw mulch refers to a layer of straw (typically wheat or rice straw) that is spread over the soil surface around plants. This mulch layer helps to cont...

A compilation of resources for managing invasive and poisonous plants of Utah's rangelands.

Weed prevention through proper turf establishment and maintenance is the best practical approach for long-term weed control, and is less expensive than controlling weeds later. Aspects of prevention include using best management practices such as proper m...

Weeds around the home are a nuisance. This guide will show you how to deal with weeds in your lawn, garden, fruit trees, parking areas and drive ways, and amoung brush and trees.

This fact sheet gives an overview of the most prevalent weeds found in Utah forests which pose a direct threat to Utah forest landowners.