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Posts Tagged: species
How a Newly Described Bacteria Species Became a Kimsey
Ever had a bacteria species named for you? No? Well, a newly described bacteria species now carries the last name of a husband-wife team: Lynn...
Former UC Davis doctoral student Matan Shelomi described a new bacteria species from the gut of a Giant New Guinea Stick Insect, Eurycantha calcarata. This is a E. calcarata from the Bohart Museum. Shelomi named the bacteria after UC Davis faculty members Lynn and Bob Kimsey. (Photo by Kathy Keatley Garvey)
Monarch Butterflies: Closer to Extinction
It was a good news/bad news/sad news kind of day on July 21 when the International Union for Conservation of Nature...
A monarch caterpillar munching away on its host plant, milkweed, in a Vacaville, Calif., garden. (Photo by Kathy Keatley Garvey)
A monarch chrysalis attached to the underside of a bird feeder. (Photo by Kathy Keatley Garvey)
A male monarch butterfly spreads its wings. (Photo by Kathy Keatley Garvey)
A female monarch butterfly spreads its wings. (Photo by Kathy Keatley Garvey)
Can California native plants be used as cover crops to benefit farmers and native ecosystems?
In late February, in an almond orchard in the Sacramento Valley, the fall-planted cover crop mix of grasses, brassicas and legumes had barely produced a green fuzz above the soil surface, and it was unclear when it would bloom. Unfortunately, this scene is becoming more frequent across California, as climate change causes more prolonged droughts and rain-dependent winter cover crops can barely grow, which delays or reduces bloom, essential for supporting pollinators. Fortunately, California native plant species have evolved with drought and have developed many strategies to survive and reproduce in those conditions.
Would it be possible to capitalize on the over 9 million acres of cropland in California for drought resilience and habitat restoration by utilizing more native species as cover crops? Our team at the UC Sustainable Agriculture Research and Education Program (UC SAREP) spent some time considering various native plant species and their potential ecological and operational attributes as cover crops. For a full list of species and their attributes, see https://ucanr.edu/sites/covercrops/.
Many native species are so well adapted to drought that they will still germinate and bloom during extremely dry years, for example, annuals like Tidy Tips (Layia platyglossa) and California poppy (Eschscholzia californica). Alternatively, perennial bulb species like Prettyface (Triteleia ixioides) and Bluedicks (Dipteronstemon capitatus) become dormant during the dry summer, retaining their bulbs below ground and re-growing when the rains return. These species could perhaps fit well in no-till orchard systems. Summer dormancy is important for tree nut growers because they usually need clean ground under the trees during harvest. Moreover, the costs to terminate and reseed would potentially be eliminated. While these species are well-known by Native Americans for their edible bulbs, at this point in time, we are not aware of any cover cropping trials having ever been conducted with these species.
Another species with strong reseeding and more availability is the annual Lacy Phacelia (Phacelia tanacetifolia), which offers an intriguing historical precedent for developing a native species for cover cropping purposes. Native to California, it was introduced into Europe in 1832 by Germans. It is very attractive to pollinators and experienced a boom there in the early 1990s. European beekeepers and farmers have been using Lacy Phacelia as a cover crop ever since, and it has recently been gaining traction on California farms as well. California has many species of phacelia, with another, described as being even more attractive to native bees, being the annual Great Valley Phacelia (Phacelia ciliata). Besides supporting native bees, other native plant species can contribute nitrogen to the soil, such as annual Lupine (Lupinus spp.) and perennial Deerweed (Acmispon glaber), which are legumes and form an association with nitrogen-fixing bacteria in their roots.
Cover crops are not usually considered marketable crops. However, we should not preclude the potential for some plants that are useful as cover crops to provide a harvestable product as well. Native perennial fiber plants such as Indian hemp dogbane (Apocynum cannabinum), narrow leaf milkweed (Asclepsias fascicularis), and common nettle (Urtica dioica) could offer the opportunity to cultivate summer cover crops that have a market value, especially in cases where farmers are already willing to irrigate their cover crops to improve their development and amplify the benefits. Bowles Farming in the San Joaquin Valley is experimenting with growing these three species for fiber production. All three also attract native bees and important butterfly species such as monarchs (as long as farmers avoid spraying insecticides).
While we believe that some native species could open new opportunities for farmers as cover crops, we still have insufficient studies testing the effects and viability of these species. Organizations like the NRCS Plant Materials Center at Lockeford and the Xerces Society are conducting practical studies with native species, creating plant guides and working with farmers to expand their use. In addition, researchers Lauren Hale of the USDA Agricultural Research Service and Anil Shrestha of California State University, Fresno, are using a 2021 UC SAREP small grant to study the effects of native species mixes on water demand and weed populations in San Joaquin Valley grape vineyards. Hale suggests that below-ground ecosystems may benefit as much from native plants as above-ground ecosystems. Says Hale, “Because plants and their microbiomes have evolved together for millennia, it seems logical that native plants would promote a good response from the native soil microbiota.”
For additional information:
UC SAREP List of California Native Species for Potential Use as Cover Crops: https://ucanr.edu/sites/covercrops/
Xerces Society lists of pollinator-friendly native species for California: https://xerces.org/pollinator-resource-center/california
NRCS California Plant Materials Center plant guides: https://www.nrcs.usda.gov/wps/portal/nrcs/publications/plantmaterials/pmc/west/capmc/pub/
UC SAREP Cover Crops Database: https://sarep.ucdavis.edu/covercrop
How Franklin's Bumble Bee May Be Found
Is Franklin's bumble bee extinct or is it just elusive? Annual search parties conducted since 2006 have failed to locate the species. Now...
The late Robbin Thorp (1933-2019) annually searched for Franklin's bumble bee but hadn't seen it since 2006. That's his image of the bee on his computer screen. (Photo by Kathy Keatley Garvey)
Robbin Thorp Would Have Been Proud
The late Robbin Thorp, UC Davis distinguished emeritus professor and a tireless advocate of pollinator species protection and conservation,...
The late Robbin Thorp, UC Davis distinguished emeritus professor, kept his image of Franklin's bumble bee as his screensaver image on his computer. He last saw the bee in 2006 at Mt. Ashland, and was the last known person to see the pollinator. (Photo by Kathy Keatley Garvey)
Robbin Thorp, an expert on pollinators, including bumble bees, co-authored these two books in 2014. (Photo by Kathy Keatley Garvey)
