- Author: John Madsen
One response to the suggestion that an herbicide be used to control aquatic weed problems in water is concern that the treatment will reduce the dissolved oxygen content of the water, with possible adverse effects on fish and other aquatic biota. In fact, some herbicide formulations even have warnings on their label to only treat one-half of a pond. However, a recent study on treating water hyacinth (Eichhornia crassipes) in the Sacramento-San Joaquin River Delta demonstrates that a decrease in dissolve oxygen is not necessarily the outcome after an herbicide treatment.
Study sites were selected based on sites with water hyacinth growing along channels, and sites in which the water hyacinth grew in sloughs...
- Posted by: Gale Perez
Here's Patrick Cavanaugh interviewing Guelta Laguerre (UC Davis undergraduate student working in the Al-Khatib Lab.)
Original source: California Ag Today Podcasts with Patrick Cavanaugh/h3>
- Posted by: Guy B Kyser
Dr. John Madsen (USDA-ARS Invasive Species and Pollinator Health, Davis, CA) just received the 2020 Outstanding Scientist Award from the Northeast Aquatic Plant Management Society. The letter of recognition says, among other things, "The Society recognizes you for your ongoing support of students, and your commitment, contributions and dedication to the field of aquatic plant management."
Dr. Madsen has participated in Weed RIC since 2014. He has developed a program studying phenology and management of waterhyacinth, Brazilian egeria, curlyleaf pondweed, and other species, concentrating mostly on the Sacramento-San Joaquin Delta.
- Author: John Miskella
- Author: Guy B Kyser
In late October we made our monthly trip to sample curlyleaf pondweed in the Sacramento-San Joaquin Delta. On an island in the lower San Joaquin river, we spotted goats eating waterhyacinth (Eichhornia crassipes) and waterprimrose (Ludwigia sp.) along the shoreline.
The goats were accompanied by a benevolent and protective llama, who showed no interest in the weeds.
- Author: Angelica Reddy
- Posted by: Guy B Kyser
Exotic water primroses (Ludwigia spp.) are aggressive invaders in both aquatic and riparian ecosystems. The plants form dense mats over the water surface. These mats constrain navigation and interfere with recreational activities, irrigation, drainage, and agricultural production. Rapid growth of these weeds also displace native plants and wildlife in aquatic ecosystems.
In the US, several exotic Ludwigia taxa have naturalized and become invasive: Ludwigia hexapetala, L. peploides subsp. peploides, L. peploides subsp. montevidensis, and L. grandiflora. Stakeholders are eager to get these weeds under control by all means necessary and one option is...