- Author: John Miskella
- Author: Guy B Kyser
During summer 2019 the Madsen lab is sampling curlyleaf pondweed (Potamogeton crispus) at multiple locations to determine the effects of water temperature, air temperature, and water turbidity on plant growth and reproduction. We collect plants each month and obtain the biomass for each part of the plant: shoots, roots, inflorescenses, and turions (asexual reproduction structures). Three locations are in Lake Berryessa, three in Putah Creek between Winters and Monticello Dam, and three in the Sacramento-San Joaquin Delta. At each location we take plant & sediment samples using a weighted dredge (Berryessa, Delta) or handheld dredge (Putah Creek, pictured below).
On one recent trip the rope broke on...
- Author: John Madsen
- Posted by: Guy B Kyser
The Delta Region Areawide Aquatic Weed Program has been focusing science and the application of science onto the management of invasive aquatic weeds such as water hyacinth, Brazilian egeria, and water primrose in the Delta. As part of the conclusion of the DRAAWP, a special session has been organized for the 2019 Joint Annual Meetings of the Aquatic Plant Management Society and the Western Aquatic Plant Management Society (http://www.apms.org/annual-meeting/2019-annual-meeting/). Six oral and nine poster presentations have been accepted for this upcoming event, to be held July 14-17, 2019 in San Diego, California. The DRAAWP executive committee have also planned on a...
Onions is a challenging crop in which to achieve good weed control. They are planted in high density configurations that preclude the effective use of cultivation. Cultural practices such as locating plantings in fields have low weed populations, as well as preirrigating up a flush of weeds followed by killing them with shallow cultivation can be effective in minimizing the population of weeds that emerge during the crop cycle. In general, excellent weed control for many of the common cool and warm season vegetables can be accomplished by a combination of the registered pre and post emergence herbicides. The weed control challenges in onions occurs with weeds that are not well controlled by currently registered herbicides. It is...
- Author: Lynn M. Sosnoskie
Mark your calendar!
July 15, 2019
The 3rd Annual UAV/Ag Technology Field Day
Presented by UC Cooperative Extension, Merced County
9am to 11:30am (CE registration begins at 8:30am)
- Author: Devii R. Rao
Fiddleneck (Amsinckia spp.) is a native plant in California. It occurs in grasslands and open, disturbed areas (DiTomaso, Kyser et al. 2013) and is sold as a pollinator plant in native plant seed mixes. Its bright yellow flowers catch the eye of those looking for wildflowers. However, it is important to note that fiddleneck is toxic to livestock.
Fiddleneck seeds contain pyrrolizidine alkaloids which can affect the liver of cattle, horses, and pigs (Fuller and McClintock 1986). Based on necropsies from livestock tested at the California Animal Health and Food Safety (CAHFS) Lab, plants containing pyrrolizidine alkaloids were the number three source of plant toxicity to livestock (Forero et al. 2011). Oleander is the...