California faces many complex challenges in the future. California must address these challenges to ensure a high quality of life, a healthy environment, and economic success for future generations.

The University of California Division of Agriculture and Natural Resource ( UC ANR), a statewide network of UC researchers and educators dedicated to the creation, development, and application of knowledge in agricultural, natural, and human resources, recently released a Strategic Vision recognizing that California’s future depends on

• sustainable, nutritious, and safe food;
• clean, healthy, and sustainable places to live, work, and grow;
• resilient, biologically diverse, and healthy ecosystems;
• clean, secure, and sufficient supplies of water;
• cleaner and more secure energy;
• educated and engaged people; leaders prepared for and capable of making strategic decisions;
• innovative solutions and informed choices;
• economic opportunity and jobs.

The Strategic Vision identifies nine strategic initiatives as a start to address the challenges that face Californians. The following multidisciplinary, integrated initiatives represent the best opportunities for ANR’s considerable infrastructure and talent to seek new resources and new partnerships within and outside UC to find solutions for California.

The conceptual initiatives are:

1. Improve Water Quality, Quantity, and Security. Water is the life blood of California’s economy. As such, water supply and quality for agricultural, urban, and environmental systems is a critical issue facing the state over the next 20 years and beyond.

2. Enhance Competitive, Sustainable Food Systems. California agricultural competitiveness will depend upon adopting new scientific and technological innovations derived from new knowledge in agriculture and nutrition.

3. Increase Science Literacy in Natural Resources, Agriculture, and Nutrition. California is undergoing a remarkable social transformation driven by two forces that have shaped the state throughout history: dramatic demographic changes in the number, age, and diversity of the population and the impact of science and technology. Education will be a key contributor to the successful outcome of this transformation, providing the principal means of making informed decisions about complex issues.

4. Sustainable Natural Ecosystems. Population growth, coupled with climate and land use changes, are the most important issues that will affect California’s natural resources.  Future urban and suburban growth is projected to shift more toward rangelands and forests.

5. Enhance the Health of Californians and California’s Agricultural Economy.

Improving the health of Californians, enhancing their quality of life, and reducing health care costs are critical to the future of California.

6. Healthy Families and Communities. The major challenge for our families, schools, and communities is to promote positive development of children, youth, and adults.

7. Ensure Safe and Secure Food Supplies. Food-borne illnesses affect one in four Americans annually, with higher rates in California. Food-borne illnesses place a burden on our health care system and reduce the productivity of our workforce. Food insecurity, which currently affects one in ten California households, places additional burdens on our health care system as poor nutrition is directly related to numerous human diseases and increased health care costs.

8. Manage Endemic and Invasive Pests and Diseases. Increases in the number and kinds of pests and diseases may negatively impact California agriculture, natural resources productivity, and ecosystem functions, affecting Californians’ quality of life.

9. Improve Energy Security and Green Technologies. California faces diminishing and more costly supplies of energy, which can be addressed in part by California’s vast agricultural and natural resource base.

The Ventura County UCCE office is already working on several of these initiatives that are within our area of expertise. Throughout the state, many other dedicated scientists, researchers, and program representatives are also working hard today for the future.

In 1823, Florida became the first state to plant a commercial citrus grove. The industry and its challenges spread across the southern states of Louisiana, Texas, Arizona and California.  Because these areas include many international ports of entry, because of their proximity to international borders and because of their favorable climate, the risk of introduction and establishment of invasive pests and diseases is heightened. In recent years Florida has returned to its status of first in the US: unfortunately Florida has been the first to be hit by many of the potentially disastrous pests facing the citrus industry.

The Asian Citrus Psyllid (ACP), carrier of huanglongbing (HLB) (also known as citrus greening disease), was first discovered in Florida in June of 1998. (See previous blog post “An introduction to the Asian Citrus Psyllid” for details on the insect and disease.)The discovered psyllid tested negative for HLB. At that time the industry in Florida was attempting to eradicate another disease, citrus canker.  Some people were unhappy with the aggressive battle against citrus canker, however, and in November 2000, an injunction on inspections and eradication was implemented in Broward County, which may be when and where the Florida HLB epidemic began.

In October 2005, HLB was known to exist in two counties. By the time it was discovered, however, the problem was well established.  By August 2008, 32 counties were infected.

In late 2005 and early 2006 key citrus stakeholders formed the Citrus Health Response Program (CHRP). This organization’s focus is a holistic approach to protecting the industry: developing and implementing minimum standards for inspection, regulatory oversight, disease management, and education and training. The goals are developed by five sub-working groups:

• Nursery and Budwood Working Group
• Production Practices Working Group
• Packing Working Group
• Processing Working Group
• Harvesting Working Group
• Residential Citrus Working Group

Common themes within CHRP are:

• The need for education and training, research, and a balance of regulatory oversight with industry due diligence
• Flexibility in adjusting to new information
• Requirements that are based on sound science and the principles of plant quarantine

It is important that we in California and other citrus-producing states learn from the hard lessons Florida is experiencing. The ACP has already been found in our state. Although HLB has not yet been detected, our response must also be organized, science-based, and flexible to sustain an important California industry.

We hear often of exotics pests and invasive species. We know that plants, pests and disease can spread in many ways. We also know new problems arrive regularly – seemingly with increasing speed.

In the Ventura County UCCE office people often show up with samples of soil, plants, and insects. We would like to take this opportunity to remind people that moving these, and related items, across geographical borders (countries, states and counties) often require permits. Permits may even be required when working with government agencies. Not obtaining a permit when required can lead to unpleasant consequences including: regulatory action, fines, or loss of research funding.

To help protect yourself and reduce the spread of exotic and invasive species, please do not move samples across geographical borders without checking if a permit is required. UC ANR Safety Note #146, “Quarantined and Regulated Pest Permit Requirements” can help. It can be found at http://groups.ucanr.org/ehs/files/68310.pdf.

Other UC ANR safety topics can be found at http://groups.ucanr.org/ehs/Safety_Notes/.

Ventura County UCCE Staff Research Associate Maren Mochizuki shares with us how monitoring spore traps in avocado orchards can lead to better understanding and management of disease.

An important component of integrated pest management is frequent monitoring to understand which, if any, pests are present and at what time of year.  In collaboration with Akif Eskalen a researcher at UC Riverside, Ben Faber, Ventura County UCCE Farm Advisor and Maren Mochizuki, Ventura County UCCE Staff Research Associate are sampling in three avocado orchards in Ventura and Santa Barbara counties using traps that catch spores, reproductive structures for many disease-causing organisms in avocado such as Dothiorella and Phytophthora

The spore traps consist of glass microscope slides suspended at two heights in the avocado tree canopy.  Every two weeks, we remove the slide and replace it with a fresh one; researchers at UC Riverside examine and identify the spores under a microscope.  We hope to improve our understanding of the life cycles of these spore-producing organisms for more effective disease management.

Young avocado tree killed by Dothiorella canker,

White, powdery exudates from a Dothiorella canker

Healthy green avocado foliage (right) next to the pale, yellow foliage of a tree with Phytophthora root rot

To protect water resources and comply with increasing regulation, greenhouse managers are wise to make changes to prevent pollutants, such as fertilizers, pesticides, and container media from ending up in surface and ground waters. One way to do this is to use vegetated buffers.

Vegetated buffers are areas or strips of land maintained in permanent vegetation to prevent erosion and improve water quality by trapping and treating contaminants. Vegetative buffers can also provide many other benefits such as increasing beneficial insects for biological control of crop pests and protecting streambanks. In addition, they can be used for green waste and secondary crop production.

Some examples include vegetated buffers are bioswales, vegetated filter strips, and constructed wetlands.

• A vegetated bioswale is a stormwater conveyance system that channels stormwater. This type of buffer system improves water quality by reducing flow velocity and increasing sedimentation, filtering pollutants, and allowing infiltration into the underlying soils.

• A filter strip is a band of vegetation that can be used between a greenhouse and a waterbody. The purpose of the filter strip is to slow runoff from the production area and trap sediment, fertilizers, and pesticides before they reach surface water.

• A constructed wetland is an artificial marsh or swamp for treating wastewater, controlling flood waters, and reducing erosion. In greenhouse production, they can be built to further remove pollutants in the effluent from a retention basin.

Although there are different types of vegetative buffer systems, most work in a similar manner. Runoff containing soluble nutrients and pesticides, and sediments with adsorbed pesticides, enters the buffer. Vegetation in the buffer slow surface flow and sediments drop out. Some water infiltrates into the root zone and subsoil, while the remainder becomes lateral subsurface flow. When the roots of buffer plants grow to sufficient depth, they intercept infiltrated water, taking up the soluble nutrients and pesticides. Pesticides adsorbed to soil particles become trapped in the root zone, and high soil organic matter provides conditions for denitrification and pesticide degradation.

Things to consider before constructing a vegetative buffer.

When planning and designing a vegetative buffer, it is best to consult a licensed engineer or the Natural Resources Conservation Service (NRCS). Buffers need to be designed and constructed to comply with all federal, state, and local laws and regulations.

Plant species that are used in buffers should be selected based on their adaptability and tolerance to site conditions. Check local information sources, such as the NRCS and Cooperative Extension, before making selections. Some points to consider are: cost, growth rate, potential of plant invasiveness if not using native plant species, and the ability to use the buffers for producing secondary crops. Growers who are interested in developing techniques to produce secondary crops in vegetative treatment systems should contact Cooperative Extension and the NRCS for guidance.

Planting should be timed so buffers are established prior to expected runoff. Maintenance of vegetative buffers is necessary to sustain buffer function and effectiveness.

The information above was extracted from a larger document, written by Ventura County Cooperative Extension Farm Advisor, Julie Newman. Please contact us if you would like to read the original document in its entirety.