Citrus Psyllid Control Strategy Changes
Reducing Sprays in Areas, and Border Nets
By Jessica Theisman, Associate Editor
Huanglongbing, vectored by the Asian Citrus Psyllid, (ACP) is the dreaded disease that has nearly wiped out the Florida citrus industry and is a potential problem for citrus growers in California. California Ag Today recently met with Beth Grafton-Cardwell, a UC Cooperative Extension Specialist. She specializes in integrated pest management; she discussed new strategies for the control of HLB.
“We have been surveying grower orchards in southern California and following how pesticide sprays are working, and I’m going to make some new recommendations on how to handle the populations down there,” said Grafton-Cardwell, who is also the director of the Lindcove Research and Extension Center. “Some regions of Southern California are easier to control psyllids than others. The pesticide treatment is less intensive due to the desert climate. San Diego is one of the areas that is less intensive due to the drier trees making them more hardened off, with less new flushes, where ACP is attracted.”
“There are other areas of southern California where the trees flush continually, providing great places for the psyllids to lay eggs, and that is where treatments are going to have to intensify,” she explained.
Areas such as Ventura, Riverside, and San Bernardino have to increase their treatments in the fall for better control.
And researchers are currently studying new prevention and control methods.
“Texas A & M has been looking at erecting net-like borders around the orchards because the psyllid tends to go to the edges,” Grafton-Cardwell said.
They want to treat the netting with yellow strips of sticky paper that would attract and/or apply insecticides to kill the psyllid.
“Our research is showing that often the infestation starts on the borders. Growers may have to intensify the number of treatments, but they don’t have to treat the entire orchard,” Grafton-Cardwell said. “Growers might be able to fight the psyllid with only treating the trees on the outer edges.”
15 Percent Chinese Tariff will Harm Farmers
CCM President Issues Statement Regarding Chinese Tariff Announcement
News Release from California Citrus Mutual
While the proposed 15% Chinese tariff increase will affect all fruits, nuts and vegetables shipped to China, California Citrus Mutual (CCM) President Joel Nelsen issued the following statement regarding the tariff increase on California citrus as a retaliatory counter to President Donald Trump’s new tariffs on steel and aluminum:
The decision by the Chinese government to levy exorbitant tariff increases on U.S. produce will surely have a direct impact on California citrus producers. Maintaining access to foreign markets and having the ability to compete in a global market place are critical to the success of the citrus industry.
The retaliatory tariffs imposed by China hinders our ability to be competitive by increasing costs for Chinese consumers, an important market for California citrus. Family farmers in our industry will suffer from the economic fallout unless we can find alternative markets for California’s While our Administration focuses on those business sectors requiring attention, the Chinese Administration has chosen to expand the discussion to include the agricultural industry. In fact, the Chinese indicated last week in a statement that constructive talks could alleviate the real issues, yet insufficient time was given to accomplish that objective. Now Chinese consumers and California citrus producers are innocent parties to a trade debate.
Nelsen, CCM Executive Vice President Casey Creamer, and Board Chairman Curt Holmes have traveled to Washington, D.C. recently for meetings with Congress and the Administration regarding trade and other important issues affecting the California citrus industry.
Relentless Search for ACP and HLB Trees
Intense Inspections of Urban Citrus Trees Continue
By Patrick Cavanaugh, Editor
Joel Nelsen is president and CEO of California Citrus Mutual, based in Exeter. He told California Ag Today recently that there is an “active plan to look for trees harboring Asian Citrus Psyllids (ACP) infected Huanglongbing (HLB) trees in urban areas because we’re looking for nobody else across this country, let alone in the southern hemisphere, to look for infected trees in the urban area. Mexico and Brazil didn’t do it. We’re doing it.”
The hope is that they find HLB and stop it there.
“Commercial growers are under tight testing programs to combat the Asian Citrus Psyllid. As far as it relates to commercial growers, we’re doing enough trapping that we’re not finding what we call hot spots of Asian Citrus Psyllids,” Nelsen said. “Secondarily and most importantly, we have a very strict clonal protection program, so growers are only allowed to access trees after they’ve gone through a rigorous testing program at both the nursery and the rootstock from the university.”
Nelsen said that the chances of a grower introducing the insect into an area is rather slim; it’s more often likely that the disease will be introduced to a grove.
Testing is random and more lab space is needed.
“Most of it’s been random because it is an intensive program. We’re analyzing roughly 20,000 leaves and twigs every month,” Nelsen explained. “We’re analyzing several thousand ACP every month. In fact, our lab capacity is capped, and one of the discussions that we’re having is to identify what labs can do what and whether or not we need to expand the number of labs doing business.”
“So we are looking at additional lab space, and in fact, we have already contracted with the University of Arizona Lab in Tucson and maybe we’ll consider using private labs to do the initial work,” Nelsen said. “Now, they’re not going to be able to confirm whether or not an ACP is there, but they go in and evaluate that twig or green waste waste and if in fact there is a suspicion, then you send in the California Department of Food and Agriculture folks.”
More Cooperation Regarding Citrus Health and HLB Disease
Citrus Health Response Program Discussed at UC Riverside
By Patrick Cavanaugh, Editor
California Ag Today recently interviewed Joel Nelsen, president and CEO of the California Citrus Mutual. He spoke on his recent trip to UC Riverside about the Citrus Health Response Program. While speaking with USDA, they discussed the game plans that will be used to battle Huanglongbing (HLB) disease, which is vectored by an invasive insect called Asian Citrus Psyllid.
“We got into it, which I thought was an interesting discussion. What would growers do if in fact HLB was discovered in a grower’s orchard and what would the be obligated to do,” Nelsen said.
“And what came out of that discussion is that we are going to work with the USDA. We’re going to develop a war game scenario. We’re going to bring people into a room and start talking about it, just to see what the reactions were, and we’re going to challenge these individuals to do what needs to be done,” Nelsen explained. “We’re just going to have to figure out how best to address the industry and areas like this.”
Nelsen said that they discussed whether or not there was enough being done in that partnership with the homeowner. “We came to the conclusion that no, quite frankly the industry has been carrying that ball and that USDA and CDFA can do a little bit more in their role as government”
Tree removal and beneficial insects were also discussed.
“We talked about the continued trees being removed, and everybody was satisfied about that. We talked about whether or not beneficial insects can help in this situation. Surprisingly, the answer was pretty much no,” Nelsen explained. “Beneficial releases may help in an urban environment to a small extent, but from a commercial standpoint, it doesn’t help. So there were a lot of discussions, some debate, and most of all, some camaraderie that was developed as far as going forward.”
Nearly 400 trees in front and back yards of homes have been destroyed due to testing positive to HLB disease.
“They’re all in a clearly defined geographical area in Southern California,” Nelsen said. “So what we have is a lot of backyard adventures that bring in rootstock that unfortunately was diseased, and as a result of that, those individuals are the ones that are seeing problems associated with their own trees.”
California Supplies Thanksgiving
California Feeds the Nation on Thanksgiving!
By Patrick Cavanaugh, Farm News Director
California ranks #8 in turkey production in the United States (2016), and we supply most of the western states from our poultry farms located in several areas in the state.
The famous Mrs. Cubbison’s Stuffing or “Dressing” originated from a ç, born in 1890 in the San Marcos area of San Diego County. In short, Cubbison graduated from California Polytechnical University in May 1920 with a degree in Home Economics having paid her way through school with the money she earned feeding the farm workers.
Cubbison created her popular stuffing in 1948 using broken pieces of the popular Melba toast and various seasonings. The factory in Commerce, California churns it out in mass quantities this time of year.
California farmers produce almonds, raisins, walnuts, prunes, figs, dates, apricots, pistachios, and pomegranates, right on up the food line.
These are all celebrated Thanksgiving foods.
Celery from the Oxnard and Ventura area completes the stuffing mix. Nutrient-dense carrots, lettuce and fresh spinach from Salinas now arrive, pre-washed and bagged, in your local produce department. Your Thanksgiving traditional green beans come from California growers.
An ample supply of freshly harvested oranges and kiwi fruit, table grapes, strawberries, and raspberries are shipped from many areas in the state. Seasonal features include sweet potatoes from the Merced, about an hour north of Fresno, plus all kinds and colors of potatoes and tomatoes, parsley, onions, and garlic—all crops are raised in California.
Nearly all the fruits, vegetables and nuts that are part of America’s Thanksgiving are sourced from California.
Don’t forget about the great varieties of wine grapes grown in the No. 1 agricultural state that are deftly crafted into delectable California wines.
Or the thirst-quenching Martinelli sparkling apple or grape cider from Watsonville California, near the Monterey Bay area. Local growers provide the tree-ripened fruit to the award-winning company that is still family-owned after almost 150 years and is managed by the founder’s grandson and great-grandson. Here’s something to discuss at your Thanksgiving meal: the company won its first Gold Medal at the 1890 California State Fair in Sacramento.
How about those heirloom and new apple varieties, plus those small round watermelons that we snack on or toss into a dessert fruit salad, topped with California pomegranate arils?
Of course, we raise poultry, and even California lamb, if you want to go that way. Here is a Did-you-know? challenge for your holiday meal: What are the most recent Presidental Thanksgiving Turkeys from California pardoned by United States presidents? (Answers are below.)
And by the way, you know that food-safety pop-up turkey timer that indicates when the turkey has reached the correct internal temperature? Public relations genius Leo Pearlstein and a turkey producer in Turlock, a small town north of Fresno in Stanislaus County, invented this Thanksgiving fixture.
Back in the 1960s, they were sitting in a room trying to solve the undercooked poultry challenge, when they looked up and noticed ceiling fire sprinklers. The sprinklers sprayed water when the room temperature became hot enough to melt a tiny piece of metal alloy in the mechanism. This innovative team of two applied the same concept to the pop-up timer!
With the exception of cranberries, our national day of giving thanks for a bountiful harvest is really a California Thanksgiving.
Here are some friendly topics for discussion at your Thanksgiving Table:
- What is the name of the famous Thanksgiving stuffing that originated in California?
- What beverage company that is still operating won its first Gold Medal at the 1890 California State Fair?
- How was the pop-up timer invented and by whom?
- How does high does California rank in U.S. turkey production?
- What are the most recent Presidental Thanksgiving Turkeys from California pardoned by United States presidents?
In 2010, President Obama pardoned Apple, a 45-pound turkey from Modesto, California-based Foster Farms; and alternate bird Cider.
In 2015, President Obama pardoned Apple, a 45-pound turkey and an alternate 43-pound bird named Honest, again from Foster Farms.
The Presidential Turkey flock are Nicholas White turkeys, which originated in California’s Sonoma Valley in 1957. Today, the Nicholas White is the industry standard. (Foster Farms)
Protecting California Citrus Industry
State’s Citrus Industry at a Crossroads
By Patrick Cavanaugh, Farm News Director
Karen Ross, Secretary of the California Department of Food and Agriculture, told California Ag Today recently that the fight to protect the California citrus industry from Citrus Greening is ongoing with many moving parts.
“We are working closely with both with USDA and county ag commissioners to protect our important citrus industry,” she said. “And funding from our federal agency partners is important in the fight.”
“There is a strong sense of urgency, and I honestly feel we’re at a significant crossroads because of the most recent Huanglongbing infected tree finds in Southern California that keep the infected Asian Citrus Psyllid numbers up,” Ross explained.
She noted that the biggest challenge is citrus in the state’s urban areas.
“The beauty of citrus is that nearly every Californian has a citrus plant of some kind. That’s also one of our biggest challenges right now, because we’re very dependent on our urban residential neighbors to allow inspectors to repeatedly go to their door, in order to take samples, and then possibly having to go back and pull trees.
Ross said that the state has dedicated full time leadership to help fight HLB. There’s a lot of moving parts in the program.
“It’s gotten very large, and we’re going do whatever we need to do to make sure California citrus has a long, long part of our history and our economy,” she said.
Ross noted that the Asian Citrus Psyllid isn’t the only pest concerning California agriculture.
“Besides our big Asian citrus psyllid program, we have ongoing medfly infestations, several fruit fly infestations, and light broth apple moth infestation, and we are working on Japanese beetle eradication programs,” she said.
Citrus Referendum Coming Up
Citrus Growers to Vote on Referendum
News Release from Citrus Research Board
California citrus growers soon will receive a critical citrus referendum ballot from the California Department of Food and Agriculture (CDFA) asking them to vote on continuing the work of the Citrus Research Board (CRB) for the next five years.
The grower-funded and grower-directed CRB was chartered nearly 50 years ago to enable California citrus growers to sponsor and support needed research that industry members otherwise would be unable to individually fund or access on their own. The Board’s mission is to ensure a sustainable California citrus industry for the benefit of growers by prioritizing, investing in and promoting sound science.
Some key areas funded include general production research, a variety improvement research program, a quality assurance program on agricultural chemical residues, and pest and disease control activities. Currently, disease control is crucially important.
The California citrus industry is now in the fight of its life to prevent the spread of the devastating disease huanglongbing (HLB) from California’s orchards.
HLB already has decimated most other major citrus growing regions, including Florida.
In California, HLB so far only has been found in 40 residential trees in Los Angeles; however, unless researchers are able to find a solution, HLB could gain a foothold in the state’s commercial groves. Currently, the CRB is dedicating its primary research efforts to controlling the spread of HLB and eradicating the disease. The Board is beginning to see some promising results; but without the CRB, much valuable research will go unfunded.
“We urge all citrus growers to vote when they receive their ballots from the CDFA,” CRB President Gary Schulz said. “Citrus is important to our state’s economy, employment, health and positive identity. We are proud to proactively protect and sustain the world’s largest fresh citrus market. The work that our researchers are conducting is vital to sustaining the California citrus industry and ensuring its continued success.”
The CRB administers the California Citrus Research Program, the grower funded and grower-directed program established in 1968 under the California Marketing Act as the mechanism enabling the State’s citrus producers to sponsor and support needed research. More information about the Citrus Research Board may be found at www.citrusresearch.org.
HLB Detected Again in San Gabriel
46 HLB Positive Trees in California
News Release from Citrus Insider
CDFA routinely conducts HLB surveys throughout the state based on a risk model that considers factors that may make an area more likely to have a presence of the disease. CDFA has further fine-tuned this approach by increasing the number of samples pulled from citrus trees that are considered high risk. This strategic approach – developed by the CDFA lead diagnostician with input from the Citrus Pest & Disease Prevention Program and leading scientific researchers – has helped pinpoint infected trees.
State and local crews are building relationships with residents in the area, which not only helps gain access to properties, but also results in swift removal of trees identified as having HLB. While removal of diseased trees is mandatory, positive homeowner relationships encourage cooperation. Of the eight trees recently detected, seven have already been removed or been scheduled for removal by CDFA. Crews are contacting the property owner of the remaining citrus tree Tuesday, March 28, and will pursue quick removal.
In 2016, CDFA collected nearly 50,000 plant samples and nearly 80,000 Asian citrus psyllid samples to test for HLB. Since sample collection began in 2008, more than 400,000 plant and psyllid samples have been collected and processed. This diligent work has contributed to quick detection and eradication of diseased trees.
As a part of the Citrus Pest & Disease Prevention Program, CDFA will continue surveying and sampling the area for HLB and keep the industry abreast of finds as they occur.
Citrus Trucks Will be Tarped
Tarped Citrus Trucks Will Fight ACP
By Melissa Moe, Associate Editor
In the ongoing battle against Asian Citrus Psyllids, an insect that is known to vector the fatal Huanglongbing disease in citrus, the California Department of Food & Agriculture has issued a new regulation to require trucks to be tarped when moving citrus. This regulation will be phased in and permit holders will be notified by CDFA.
Joel Nelsen, president of the California Citrus Mutual, explained that the regulation will prevent the spread of this vector-transmitted pathogen. “What we discovered is that psyllids were flying towards fruit sitting in trucks and bins as they were being transited from Southern California to the San Joaquin Valley, because of the aromas that the fruit gives off,” he said.
Fruit is not considered to be a vector of Huanglongbing since ACP can only vector the disease through leaves and twigs. However, these pests are catching rides on trucks all over the state on the fruit that was considered to be relatively safe.
“What happens is the Asian Citrus Psyllid is attracted to the aroma coming off of the orange, and it flies towards it thinking it’s going to find a food source,” Nelsen said. “Well, it rides around on the orange for a couple of hours, until it figures out that there’s no green waste or twigs attached to that fruit, and then it flies off.”
Fruit that is being transported from Bakersfield to Fresno could be taking these hitchhiking pests anywhere along Highway 99. While on this joyride, they could go up and down 5, across 126, or across 10 from Southern California into the San Joaquin Valley. News of new ACP finds have been right along these traveling corridors.
“We discovered that we may be part of the problem in helping Asian Citrus Psyllids spread, or have a hitchhiker role,” Nelsen said. “We made that determination as a result of some research done by the University of California. We ended up talking to growers at seven different grower meetings; several hundred in total were participating in the discussions. We all came to the conclusion that it’s going to cost us some money now, but it’s better than costing us the industry later.”