Many parks, recreational areas, and outdoor venues in California are home to yellowjacket wasps (Vespula spp.). Yellowjackets are commonly attracted to human food items, creating a serious nuisance and a potential stinging threat. If found, nests (usually underground) can be effectively treated with targeted insecticide applications (e.g., dusts containing pyrethroids). However, baiting could be a feasible alternative method to suppress yellowjackets over a wide area, especially if nests cannot be located. Currently, only one active ingredient (esfenvalerate) is registered for use within bait in California to control...
- Author: Michelle Leinfelder-Miles
Weeds are important pests of California rice systems, and weed management can account for roughly 17 percent of total operating costs, according to a UC cost of production study. Integrated weed management uses cultural and chemical practices and considers the following:
- Prevention (e.g. using certified seed, equipment sanitation, maintaining roads and levees)
- Cultural practices (e.g. land leveling, crop rotation, tillage, winter flooding,...
- Author: Phoebe Gordon
Bloom is an important time in all crops, and pistachio is no exception. Some of the activities that are often performed around bloom is mowing or tilling row middles, as well as application of burndown herbicides. However, recently released results from a research project led by Lu Zhang (and also included Bob Beede, Gary Banuelos, Christopher Wallis, and Louise Ferguson), formerly a postdoctoral scholar at UC Davis and now a professor at Oklahoma State, may make you want to rethink the timing of those activities. While I'm writing about this, I was not involved in the research.
- Author: Caroline Brady, Waterfowl Programs Supervisor, California Waterfowl
- Contributor: Mark Lundy
Winter grains like wheat and triticale are incredibly attractive to nesting ducks. Winter grains are seeded in the fall and grow throughout the winter; by nesting season, a dense stand of winter grains near a planted rice field looks like a great nesting location with brood-rearing habitat just a waddle away. Several studies have found ducks may favor winter planted grains over natural uplands when they're available, and winter grains in rice country can produce far higher mallard nest densities and nest survival than anything in the Prairie Pothole Region.
Unfortunately, some winter grains like wheat have been declining along with its poor market price, and the Sacramento Valley's once robust mallard population is declining...
Participants from the 2019 prescribed burn workshops put on by the UC ANR Central Sierra were invited to burn at UC Berkeley's Blodgett Forest several times in February. Because January and February were so dry, fuels dried out enough to carry fire.
On Feb. 7, a group of about 20 workshop participants, partners and students burned 15 acres in one day at Blodgett. The burn met objectives of reducing surface fuels and killing young tree seedlings, which inhibited the future development of a ladder fuel layer. Below are some details about the burn to explain how it was carried out.
Burn location: Blodgett staff...