- Author: Dr. Paul Pratt
- Editor: Guy B Kyser
It may be widely understood that most aquatic and wetland weeds are spread by water currents, but the patchwork of colonizing exotic plants can be puzzling. Why do weeds establish in some places but not others? Generally, the number of propagules (seeds or plant fragments) moving in a watershed is assumed to increase downstream. This assumption influences management decisions, such as prioritizing management efforts between upstream and downstream areas of a river to reduce reinvasion.
Uruguay waterprimrose (Ludwigia hexapetala) is an emergent aquatic weed from South America which has invaded many riverine wetland ecosystems in the western US and Europe. This is a clonal plant which can reproduce asexually via shoot...
- Author: Lynn M. Sosnoskie
Why is weed identification important? Simply stated, because not all management strategies are equally effective against all weed species. The weed community present in a given field, orchard, or vineyard may be comprised of species that are differentially sensitive to different herbicide modes of action or physical control practices. Even closely related species may respond differently to different herbicide active ingredients. For example, according to UC IPM crop management guidelines, metribuzin and S-metolachlor can provide partial control of yellow nutsedge (Cyperus esculentus) but no control of purple nutsedge (Cyperus rotundus). Consequently, to develop effective weed control programs, managers should be aware...
- Author: Travis M Bean
Invasive plants don't get much coverage in the news, especially at the state and national level. As I've argued previously, this lack of media attention is a problem when it comes to motivating the public and political players into proactively funding invasive plant management and mitigating impacts to human health, infrastructure, and natural resources. Admittedly, as a weed scientist, I'm biased on the issue.
However, sometimes there is a particular plant that is just so terrifying that it lends itself to coverage in a major news outlet, as was the case for this article about giant hogweed (Heracleum...
- Author: John Madsen
- Posted by: Guy B Kyser
We are doing a trial of eleven aquatic herbicides for their potential to control Brazilian waterweed (Egeria densa). The active ingredients being tested are bispyribac sodium, carfentrazone, copper-ethylenediamine complex, diquat, dipotassium salt of endothall, the dimethylalkylamine salt of endothall, florpyrauxifen-benzyl, flumioxazin, fluridone, imazamox, and penoxsulam. The study is a twelve-week static exposure of a single initial treatment, using all of the 50 tanks in the mesocosm facility. While not all of these aquatic herbicides would be allowed in the Sacramento/San Joaquin River Delta, we should at least know what might be useable in other habitats near the Delta. Currently, California State Parks Division of...
An in-depth workshop that covers the principles and practices of rice production:
Tuesday, August 7, 2018
Lundberg Family Farms
Richvale, CA 95974
- 8:30 Sign in, pick up class materials
- 9:00 Introduction and Workshop Overview
- 9:10 Rice Growth and Development
- 9:30 Land Formation, Water...