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California peaches are in good shape

The warmest winter since 1907 in south-central Texas has left its peach crop with inadequate chill hours this year, reported Lynn Brezosky in the San Antonio Express-News.

Without sufficient chill hours over the winter, the buds didn't get the re-boot they need to bloom in proper synchrony, which is important for blossoms to set fruit. The leaves have also been slow to emerge. "The trees look like it's still winter," said Jim Kamas, Texas A&M AgriLife Extenson horticulturalist.

“The lack of chill hours is a big deal,” said Larry Stein, extension horticulturalist with AgriLife Research & Extension Center.

The Texas trouble combined with a cold blast that destroyed half the crop in Georgia and North Carolina this spring mean peaches are likely to be in short supply this year.

The sweet spot, Brezosky wrote, may be California, the No. 1 peach producer in the nation. Roger Duncan, UC Cooperative Extension pomology adviser, could think of no major problems affecting the southern part of the state's fresh market peach crop.

“I think in general it's probably going to be just fine,” he said.

The Elegant Lady peach is one of many excellent varieties that are produced in abundance by California peach growers.
Posted on Friday, April 21, 2017 at 1:10 PM

California trees are under attack at many fronts

Trees in several parts of California are suffering greatly in recent years due to pests, fire, drought and now heavy rain. UC Cooperative Extension is working with landowners and communities to protect the state's natural environments, including its beloved trees.

UCCE plant pathology specialist Matteo Garbelotto said the wet 2016-17 winter is bad news for oak trees in North Coast areas because it has created conditions that support the spread of Sudden Oak Death, reported Bay Nature. He is recruiting volunteers for 15 “bioblitzes” in April and May to track the spread of the disease. See more on the Garbelotto website.

A mature live oak dying from Sudden Oak Death at the Pepperwood Preserve in Sonoma County.

UCCE forestry and natural resources advisor Susie Kocher held a workshop in Sonora for owners of forestland in the Sierra Nevada, where the epic 2010-16 drought killed millions of trees. Sally Shilling of Capital Public Radio attended and reported on the meeting. "There's just a lot of changes that need to be made to get to a resilient forest and hopefully this situation will help people notice that we have a crisis and that we can move forward and make some changes in how we do business," Kocher said. The federal government and CalFire have programs that can help landowners remove dead trees and replant.

Dead trees in the Sequoia National Forestd. (Photo: U.S. Forest Service)

In Southern California, the polyphagous shot hole borer could kill as many as 27 million trees in Los Angeles, Orange, Riverside and San Bernardino counties, including parts of the desert, reported Louis Shagun in the Los Angeles Times. Mark Hoddle, UC Cooperative Extension biocontrol specialist, said that the tree loss is starting to cascade across the urban landscape. “Without shade trees, water temperatures will rise and algae will bloom in riparian areas, for instance,” Hoddle said. “As a result, fish, frog and native insect populations will diminish, along with the pleasure of hiking, because there'll be nothing to look at but dead boughs of trees.”

Polyphagous shot hole borer introduces a lethal fungus when it bores into trees.

In Lake County, UC Cooperative Extension director Gregory Giusti gathered with 400 members of the community to replant trees in a park that was left treeless by the devastating Valley Fire of 2015, reported Elizabeth Larson in Lake County News. While a lot of people lost their houses, “It was the trees that made it their home. People wanted to live in the forest. They wanted to live among the trees. So this is a way to rebuild their home, to get back what was lost,” Giusti said.

A wall of flames and smoke across Lake County, part of the fast-moving Valley Fire in California, Sept. 13, 2015. (Photo: CalFire)
Posted on Wednesday, April 19, 2017 at 8:35 PM

UC ANR scientists help fledgling Tanzania avocado industry

Dedicated growers and research support from the University of California have made avocados a California success story. As part of the UC Global Food Initiative, which is channeling UC resources toward sustainably feeding the world's growing population, the California avocado experience can help alleviate food insecurity and poverty overseas.

Two UC Cooperative Extension specialists found a way to do that in Tanzania, Africa, where 69 percent of the population live below the poverty line and 16 percent of children under 5 are malnourished. In March 2017, UCCE biocontrol specialist Mark Hoddle and UCCE subtropical crops specialist Mary Lu Arpaia traveled to the east African nation to help growers there with their fledgling avocado industry.

Mary Lu Arpaia inspecting locally produced avocados being sold in a road side stall. (Photo: Mark Hoddle)

In the late 19th Century, German missionaries introduced avocados to Tanzania when it was colonized by this European nation. Germany lost influence over the African country following World War I, but huge non-commercial avocado trees still thrive in the landscape.

Recently, attempts at commercial production growing the popular Hass variety are gaining momentum.

With proximity to a European market hungry for fresh avocados, Rungwe Avocado Company planted 250 acres of the Hass variety in the southern highlands around Mbeya near Lake Malawi, which establishes the border of south western Tanzania with Zambia and Malawi. In order to grow production to a level that would make the export to Europe practical and to support rural residents with a viable business option, approximately 3,700 small landholder farmers, known as outgrowers, were recruited to grow avocados. They manage small plots with as few as 20 trees to larger acreage with more than 200 trees, with participating farms ranging in elevation from 1,200 to nearly 6,000 feet.

Meeting with avocado outgrowers in Tanzania.

However, this fledgling industry is experiencing production challenges, prompting the company to contact UC Cooperative Extension. UC faculty, specialists and advisors have conducted research on Hass avocados for decades in California and worked closely with growers to extend information that has supported the development of an industry with high-yielding trees producing premium fruit valued at more than $400 million per year.

“One of the aims of the Global Food Initiative is to deploy UC's best research and extension practices to address the key challenge of improving food production,” Arpaia said. “That's why we went to Tanzania.”

Hoddle and Arpaia visited growers, extension technicians, packing house managers and logistics experts. They identified production, pest management and fruit handling challenges faced by the avocado industry.

“The situation in Tanzania is quite different than California, and also different compared to Central and South America, where we have also worked on avocado production issues,” Hoddle said. “But we identified familiar issues that affect management for which there are solutions.”

Mark Hoddle sharing insects with interested children in an avocado orchard in Rungwe District, Tanzania. (Photo: Mary Lu Arpaia)

Hoddle examined the Tanzanian avocado trees and fruit, and collected insect specimens. He said the insect damage was minimal at the time of the week long visit.

“That surprised me because of the insect biodiversity in Africa,” he said. “There was little evidence of heavy leaf feeding. There was some evidence of fruit damage caused by insect feeding on the skin, but they don't seem to have fruit boring weevils or caterpillars that we commonly see in parts of Mexico, Central and South America.”

A critical issue is extending entomological information to the outlying farmers to improve their ability to identify and manage beneficial insects and crop pests.

“They don't have the magnifying loops, collecting vials and insect boxes that we regularly use for insect identification,” Hoddle said. “I showed them my Leatherman tool, which can be used to open up fruit and look for damage. They need these basic tools.”

A post-harvest expert, Arpaia was able to identify ways to improve picking, handling, storage and shipping practices that would result in top quality fruit arrival in Europe.

The two scientists produced a report, which emphasized the need to provide outlying growers with basic equipment and agronomic information.

“We want to help them be better avocado farmers so the crop can be a greater contributor to the country's economy,” Arpaia said. “Boosting this industry will also give people all over Tanzania the opportunity to add nutritious avocados to their diets.”

Mary Lu Arpaia photo-documenting avocado fruit morphology in Tanzania
 
Mark Hoddle and avocado extension technicians examining and identifying insects collected in a Hass avocado orchard in Rungwe District, Tanzania. (Photo: Mary Lu Arpaia)
Posted on Tuesday, April 18, 2017 at 11:32 AM

Free forestry workshops to help teachers meet new science standards

Middle school teachers attending the Forestry Institute for Teachers hear about Project Learning Tree curriculum and other resources they can use to teach environmental education.

California's K-12 teachers are being challenged by the Next Generation Science Standards to find new and more engaging ways to teach science. Adopted by California in 2013, the science-education standards guide how science, technology, engineering and math education are delivered to students in the classroom. The Forestry Institute for Teachers (FIT) offers free environmental education training for teachers in a northern California forest.

“Teachers who participate in the Forestry Institute for Teachers learn to apply Next Generation Science Standards concepts as they develop or refine class lessons using the forest as a lens through which all classroom subject matter can be taught,” said Mike De Lasaux, UC Cooperative Extension natural resources advisor for Plumas and Sierra counties and a FIT instructor.

Teachers wade into a stream to learn about aquatic life.

Learning science through FIT's participatory model is more exciting than memorizing facts from a textbook. In the forest, FIT instructors point out opportunities for students to use technology, engineering and math to better understand the world around them. For example, math can be used to estimate the height of a towering tree. Seeing the “web of life” relationships, such as the effects of rainfall and insects on tree growth, leads to more critical thinking to solve problems.

 “The goal of the Forestry Institute for Teachers is to provide K-12 teachers with knowledge, skills and tools to effectively teach their students about forest ecology and forest resource management practices and much more,” said De Lasaux.

Teachers make wildlife track casts as part of a wildlife education activity.

California teachers from rural and urban settings are invited to spend a week during the summer working outdoors with natural resources experts to gain a deeper understanding of forest ecosystems and human use of natural resources. The participants are organized by grade level for age-appropriate activities. They take field-trips and do hands-on activities such as examining the rings in a tree's cross-section to learn about events – such as wet or dry periods, insect or disease damage – that have occurred during the tree's lifetime.

Participants use clinometers to measure angles to estimate tree height.

The Forestry Institute for Teachers has been providing science education and other subject content to California K-12 teachers since 1993 with more than 2,500 educators completing the program. 

FIT is a week-long residence program developed by the Northern California Society of American Foresters in collaboration with the University of California Agriculture and Natural Resources' Cooperative Extension, the USDA Forest Service, CALFIRE and other entities. The FIT Program is underwritten by a consortium of public and private sources.

FIT is offered in forested settings in four different Northern California locations:

  • June 11-17 in Plumas County
  • June 18-24 in Tuolumne County 
  • July 2-8 in Shasta County
  • July 9-15 in Humboldt County 

There is an application fee of $25, but training, meals and lodging are free for first-time participants.To watch videos of past participants discussing their FIT experience and to apply to attend, visit www.forestryinstitute.org.

FIT participants learn how changes in one part of the ecosystem affect others in the web of life.

Posted on Tuesday, April 18, 2017 at 9:38 AM

New era of western wildfire demands new ways of protecting people, ecosystems

Humans will have to adapt to living with wildfire, write University of Colorado Boulder and UC ANR scientists. Adaptation includes reforming federal, state and local policies that have the unintended consequence of encouraging people to develop in fire-prone areas.

Current wildfire policy can't adequately protect people, homes and ecosystems from the longer, hotter fire seasons climate change is causing, according to a new paper led by the University of Colorado Boulder.

Efforts to extinguish every blaze and reduce the buildup of dead wood and forest undergrowth are becoming increasingly inadequate on their own. Instead, the authors—a team of wildfire experts—urge policymakers and communities to embrace policy reform that will promote adaptation to increasing wildfire and warming. 

“Wildfire is catching up to us,” said lead author Tania Schoennagel, a research scientist at CU Boulder's Institute of Arctic and Alpine Research. “We're learning our old tools aren't enough and we need to approach wildfire differently.”

This means accepting wildfire as an inevitable part of the landscape, states the new paper[1]  published today in the journal Proceedings of the National Academy of Sciences.

The western U.S. has seen a 2-degrees-Celsius rise in annual average temperature and lengthening of the fire season by almost three months since the 1970s; both elements contribute to what the authors refer to as the “new era of western wildfires.” This pattern of bigger, hotter fires, along with the influx of homes into fire-prone areas—over 2 million since 1990—has made wildfire vastly more costly and dangerous.

“For a long time, we've thought that if we try harder and do better, we can get ahead of wildfire and reduce the risks,” said Schoennagel, who also is an adjunct faculty member in CU Boulder's Geography Department. “We can no longer do that. This is bigger than us and we're going to have to adapt to wildfire rather than the other way around.”

As part of this adaptation process, the authors advocate for actions that may be unpopular, such as allowing more fires to burn largely unimpeded in wildland areas and intentionally setting more fires, or “controlled burns,” to reduce natural fuels like undergrowth in more developed areas. Both these steps would reduce future risk and help ecosystems adapt to increasing wildfire and warming.

They also argue for reforming federal, state and local policies that have the unintended consequence of encouraging people to develop in fire-prone areas. Currently, federal taxpayers pick up the tab for preventing and fighting western wildfires—a cost that has averaged some $2 billion a year in recent years. If states and counties were to bear more of that cost, it would provide incentive to adopt planning efforts and fire-resistant building codes that would reduce risk.

Re-targeting forest thinning efforts is another beneficial reform suggested by the authors. The federal government has spent some $5 billion since 2006 on thinning dense forests and removing fuel from some 7 million hectares (17 million acres) of land, often in remote areas. But these widespread efforts have done little to reduce record-setting fires. Directing thinning projects to particularly high-risk areas, including communities in fire-prone regions and forests in particularly dry areas, would increase adaptation to wildfire, the authors said.

Additionally, as climate change forces species to move their ranges, some may vanish entirely. Familiar landscapes will disappear, a fact that makes many people balk. But such changes, including those caused by wildfire, could be necessary for the environment in the long run, says Max Moritz, University of California Cooperative Extension wildfire specialist and a co-author on the paper.

“We need the foresight to help guide these ecosystems in a healthy direction now so they can adjust in pace with our changing climate,” Moritz said. “That means embracing some changes while we have a window to do so.”

Critical to making a policy of adaptation successful, said Schoennagel, will be education and changing people's perception of wildfire. “We have to learn that wildfire is inevitable, in the same way that droughts and flooding are. We've tried to control fire, but it's not a control we can maintain. Like other natural disasters, we have to learn to adapt.”

 

Posted on Monday, April 17, 2017 at 1:00 PM

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