Richard Smith is the UC Cooperative Extension Vegetable Crop Production and Weed Science Advisor for Monterey, Santa Cruz and San Benito counties and Daniel Hasegawa is a USDA ARS Research Entomologist for the Crop Improvement and Protection Research Unit in Salinas, California.
Impatiens necrotic spot virus (INSV) caused significant crop loss in 2020. The disease was most severe north of Gonzales, but later in the production season it...
- Posted by: Gale Perez
November 2020 contents:
- Is Irrigating Alfalfa After Last Cutting a Good Idea?
- What To Do When an Animal Dies? Composting Could Be the Answer
- Blue Alfalfa Aphids Management
- The Continued Saga of Injury to Roundup Ready Alfalfa Following Applications (page 5)
- Tips for Maximizing Wheat and Barley Yields
- Author: Thomas Getts
A few months ago Rob Wilson wrote an excellent blog highlighting perennial pepperweed patches he was seeing in the Klamath Basin. It is a terrible noxious weed, which is found throughout much of the state, from sea level up to 8,000 ft. in the Sierras.
Where I live in the Honey Lake Valley, perennial pepperweed is widespread and has completely overtaken vast acreages of unmanaged pastures and riparian areas. At one point, it was estimated around 64,000 acres of land were infested throughout Lassen county. Generally, the Honey Lake Valley and Long Valley are hotspots that contain the majority of the acreage. While I live in the Honey Lake Valley, I also...
Despite the tremendous need, there are currently no preemergence herbicides that are organic-compliant. Steam injected into the soil such that the soil temperatures reach >140°F for 15-20 minutes will kill weed seed in the soil. The effect of this reduction in the seedbank viability results weed control in the treated area that persists for several weeks or months, similar to the effects of a preemergence herbicide.
Two studies were conducted at the USDA Hartnell Farm at Salinas, CA during July to September 2020. Steam was applied to raised beds using a custom-built steam injector. Prior to seeding lettuce, steam was applied in a 4-inch wide band to a depth of 3 inches deep. The steam was supplied by a SF-20 Sioux steam...
- Posted by: Gale Perez
Mark your calendar...
Managing Weeds in Grasslands and Rangelands in the Context of Fire in California
The latest information on weed control and fire will be presented at the Managing Weeds in Grasslands and Rangelands in the Context of Fire in California webinar on Wednesday, November 18, 2020. The lineup of UC Cooperative Extension (UCCE) and UC Davis experts will discuss how fire interacts with plant communities in rangeland ecosystems, how grassland management influences fire severity and how management practices impact post-fire vegetation recovery.