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Andrew Kniss

Associate Professor of Weed Ecology & Management, Department of Plant Sciences at the University of Wyoming

Expert Bio

Andrew Kniss is an Associate Professor of Weed Ecology & Management in the Department of Plant Sciences at the University of Wyoming. He has a PhD in Agronomy with a minor in Statistics. Andrew's research program focuses on developing weed management programs in agronomic crops, especially sugarbeet, winter wheat, corn, and dry edible beans.

He has authored or co-authored 20 peer-reviewed journal articles and 1 book chapter. He teaches undergraduate and graduate level courses including Ecology of Plant Protection, Weed Science & Technology, and Applied Dose Response Analysis. He recently received the Outstanding Weed Scientist – Early Career award from the Western Society of Weed Science, and serves on the Board of Directors of the Weed Science Society of America. He grew up on a small farm in Nebraska. His interest in weeds began early in life after being forced against his will to pull nightshade berries out of dry bean windrows prior to harvest (he now thanks his dad for that experience).

Studies, Articles and Answers

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Are herbicides responsible for the decline in Monarch butterflies?

By Andrew Kniss - May 15, 2014

Originally posted on Control Freaks: Wyoming Weed Science in (almost) Real Time blog.The monarch butterfly is in bad shape. The number of monarchs returning to their overwintering sites in Mexico has been declining steadily for at least a decade. The consensus suggests there are several reasons for this decline, including loss of their overwintering habitat and unfavorable weather patterns. But the purported cause of monarch decline that seems to get the most coverage is the loss of milkweed (Asclepias spp) in the midwestern US migratory path. The evidence seems clear that the [...]

Environment Crop protectants


Superweeds: A Mutating Problem

By Andrew Kniss - Oct 09, 2014

Originally posted at Weed Control Freaks.Superweeds have been in the news a lot over the last few months. Most of the recent coverage has been related to new 2,4-D resistant crops that were recently approved by the USDA and the new herbicide formulation (2,4-D plus glyphosate) that the EPA is reviewing. Marc Brazeau recently wrote a compelling piece arguing that our focus on superweeds in GMO crops draws attention away from solutions that could really help make modern agriculture more sustainable. I’ve written about various aspects of so-called superweeds before, several times. In one of [...]

Environment GMOs & Farmers Crop protectants


What have they done to our food?

By Andrew Kniss - Jan 06, 2015

Originally posted at Weed Control Freaks. People in developed countries seem more interested than ever in the way their food is produced. Genuine interest in the food we eat is, without question, good for society. The American Farm Bureau Federation estimates that the average American is at least three generations removed from the farm. Although many people in developed countries now have little firsthand knowledge of how modern farms operate, they are hungry for this type of information. As demographics continue to shift away from agriculture, it is important tha [...]

Environment GMOs & Farmers Crop protectants


Q: Does overuse of Roundup in Roundup Ready seed planting create aggressive, herbicideimmune superweeds, which have to be deracinated or treated with even more toxic chemicals?

Answered By Andrew Kniss - Jun 19, 2015

A: There are a lot of misconceptions about so-called “superweeds”. So much so, in fact, that the Weed Science Society of America has recently written a fact sheet about this topic:   “Misconception: Herbicide use is creating a new breed of herbicide-resistant superweeds unlike anything we’ve ever seen before.   “Reality: The costly issue of herbicide resistance isn’t new – and neither are the competitive characteristics of weeds. Although the number of acres affected by resistant weeds has increased over the last decade as more growers [...]

How GMOs Are Made Crop protectants