- Author: Guy B Kyser
The Delta Region Areawide Aquatic Weeds Project will host an update meeting Thursday, August 18, 9-12 am, at the San Joaquin Cabral Agricultural Center, 2101 E. Earhart Ave., Suite 100, Stockton, Assembly Room 2. We'll present information on the current status of projects on management of waterhyacinth and egeria, remote sensing of aquatic weeds across the Delta, mosquito ecology, and more.
- Author: Guy B Kyser
- Author: John Madsen
In June 2016 the Madsen team revisited the site of our 2015 surfactant study to establish a more extensive test of aquatic herbicides for controlling waterhyacinth in the Delta.
Recall that in summer 2015 we established a preliminary trial to evaluate waterhyacinth response to different aquatic surfactants with glyphosate, using our famous floating quadrats with color-coded swim noodles (Figure 1).
By season's end, the crawdads had chewed up most of the swim noodles, so this year the quadrats underwent a slight redesign. We used thinwall 2” PVC, no noodles, and no fencing (Figure 2). (Calculating the enclosed volume and the weight per linear foot, we figured we had 8 to 10 pounds of ‘float' per...
- Author: Guy B Kyser
This is the time of year when small islands of waterhyacinth break loose from their parent mats, seeking new marinas to clog up. The Madsen team is embedding radio dog collars into freefloating mats to track their movements with the currents, tides, and wind.
This study is conducted in cooperation with DRAAWP, the Delta Region Areawide Aquatic Weed Project.
- Author: John Madsen
- Author: Angela Llaban
The USDA ARS and California State Parks, Division of Boating and Waterways have initiated a study to address concerns that dissolved oxygen may be depleted by plant decomposition under herbicide-treated beds of water hyacinth. Using state-of-the-art miniaturized dissolved oxygen / temperature recording datasondes, the oxygen concentration will be measured before and after treatment of waterhyacinth in channel-side and back-bay areas of the California Sacramento / San Joaquin River Delta, as well as under untreated water hyacinth and in open water areas. Herbicide treatments that will be evaluated include 2,4-D, glyphosate, and imazamox.
The study will be six weeks in duration, and encompass six sites using 25 datasondes. We...
- Author: John Madsen
- Editor: Guy B Kyser
The preliminary agenda for the Aquatic Plant Management Society Annual Meeting, July 17-20 2016, has been posted on the APMS website at http://apms.org/annual-meeting/2016-annual-meeting/.
The APMS annual meeting will be held at the Amway Grand Hotel in Grand Rapids, Michigan.
Meeting registration and hotel reservation information is also available at the APMS website.