A new publication, "How to Attract and Maintain Pollinators in Your Garden," (Publication 8498) has been added UC Agriculture and Natural Resources (ANR) catalog. The document is a collaboration of UC experts which includes an entomologist, laboratory assistants, landscape designer, photographer, and pomology expert.
Pollination is crucial to the survival of much of our ecosystems and maintaining viable environments for them to thrive provides not only benefits to personal outdoor space, but adds to the well being of the community at large.
This publication focuses on ways to make your garden and outdoor environment, including avocado orchards more attractive to pollinators by identifying pollinators and the plants and landscaping practices that appeal to them.
ANR Publication 8498 is free of charge and available as a downloadable PDF.
You can download this publication here.
UC Riverside and the Citrus Research Board partner to provide:
UC Riverside Citrus Day for Professional Industry members
Thursday, February 20, 2014
8 a.m. to 3:00 p.m.
UCR Agricultural Operations, Riverside, California
For information: (951) 827-5906
Please join us for the 3rd Annual Citrus field day designed for citrus growers and citrus industry representatives. Pending approval, we will be offering 2.5 hours of California Continuing Education
Credit for Pest Control Advisers (PCA).
Presentations, field tours and topics of interest:
Pesticide safety – Vince Samons
Update on ACP and HLB in California – Joseph Morse
Phytophthora diseases of citrus – Jim Adaskaveg
Lemon Varieties for the Desert –Glenn Wright
Understanding factors that influence the eating experience in citrus – David Obenland and Mary Lu Arpaia
Citrus Variety Collection tours of new cultivars and “unforbidden” fruits – Tracy Kahn, David Karp, Tom Shea, and Robert Krueger
Update on Citrus Rootstock Field Demonstration – Mikeal Roose
Barbeque Lunch included.
Registration: $18. Deadline: February 14, 2014. There will be no walk-in registrations. We will email directions and updates to all who have registered.
Space is limited so please register early.
Please register online at
To make a tax-deductible contribution to the
Citrus Variety Collection Endowment fund or the Citrus Research Center & Agricultural Experiment Station support fund go to the following link and select College of Natural and Agricultural Sciences then select the specific fund:
- Author: Brad Hanson, UC ANR Weed Specialist
Here is an updated guide for herbicides that are registered for citrus, avocado and a few other tree crops.
GAINESVILLE, Fla. — Researchers from the Institute of Food and Agricultural Sciences at the University of Florida are closer to finding a possible cure for citrus canker after identifying a gene that makes citrus trees susceptible to the bacterial pathogen.
Citrus canker, which causes pustules on fruit, leaves and twigs, is a highly contagious plant disease and spreads rapidly over short distances. Wind-driven rain, overhead irrigation, flooding and human movement can spread citrus canker. Human transport of infected plants or fruit spreads the canker pathogen over longer distances.
In Florida, the last extensive canker outbreak occurred beginning in 1995, which led to an ultimately unsuccessful eradication program that ended in 2006. That effort cost an estimated $1 billion and stimulated renewed efforts for more effective and economical controls. Farmers destroyed more than 16.5 million citrus trees between 1995 and 2012.
Yang Hu, a former doctoral student working with Jeff Jones, a professor in plant pathology, found the critical trait in the bacterium that is necessary for disease development. Hongge Jia, a researcher at UF's Citrus Research and Education Center in Lake Alfred, and Nian Wang, an associate professor in microbiology and cell science also based at the Citrus REC, along with six researchers from three universities worked on the project, as well.
Citrus canker continues to be a problem and exists in most citrus-growing areas in Florida. While scientists like Hu are devoted to eradicating the disease, many other researchers are now also battling citrus greening, which threatens to wipe out the $9 billion industry.
Citrus canker is caused by the bacteria Xanthomonas citri. While studying the bacterial pathogen's role in infected citrus, researchers were able to identify a gene in citrus critical to the development of citrus canker, known as the susceptibility, or “S” gene.
By finding the susceptibility gene, researchers say they are closer to a cure for the disease.
“The S gene represents an excellent candidate for control measures for the citrus bacterial canker,” Hu said.
Hu and Jones said they hope to secure funding to support further research, and have already identified several genes they believe could be engineered to obtain broad-spectrum plant resistance to most kinds of citrus canker.
“Once you know what the susceptibility gene is, it's possible to design multiple strategies for disease control,” Jones said.
The research paper was published online this month by Proceedings of the National Academy of Sciences: http://www.pnas.org/content/early/2014/01/08/1313271111.abstract.
Several calls have come in from growers lately about yellow avocado and citrus trees. the yellowing is most common on the late summer flush leaves or can affect the whole canopy on young trees. In severe cases leaves fall. This happens going into winter after a warm fall when growing conditions are good. During the winter, the root systems become depleted of stored starch and die.
During winter, trees go into what is called a “quiescent” state, a version of dormancy found in subtropical tree crops. This is a resting mode that protects them to a certain degree from frost damage. There is not much that can be done in a field setting until temperatures warm up and the trees begin growing again in late winter/early spring. As the temperatures increase, the trees gradually recover and the foliage re-greens.
Winter Yellows can be exacerbated in years when we do not have leaching rains to remove salts from the root zone. And it can also be more severe when we have those years when winter rains just never seem to stop and rootzones become waterlogged. We may never see that time again.
Photo by Greg Moulds