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Below you'll find a list of all posts that have been categorized as “California Corner”
University of California Riverside Extension subtropical horticulturist Mary Lu Arpaia recently discussed the uses of the plant growth regulators 2,4-D, NAA and ethylene in California citrus. Her June 9 presentation was part of the Citrus Research Board Webinar Series. 2,4-D One use of 2,4-D in California is to increase fruit size of navel oranges, grapefruit, mandarins and mandarin hybrids. For …
There are numerous preharvest and postharvest uses of gibberellic acid (GA) in California citrus, a University of California Riverside Extension subtropical horticulturist reported during a June 9 webinar. Mary Lu Arpaia’s GA discussion was a major portion of her broader topic of plant growth regulators in California citrus. Her presentation was part of the Citrus Research Board Webinar Series. WHAT …
The California Department of Food and Agriculture (CDFA) is responding after invasive glassy-winged sharpshooter (GWSS) insects were found on shipments of grapevines sold at select Costco locations in Northern California between April 21 and May 19. GWSS spreads the bacterium that causes Pierce’s disease, a fatal grapevine disease that threatens California vineyards. It can also damage citrus trees, landscape plants …
University of California Agriculture and Natural Resources (UCANR) recently issued an Extension advisory regarding citrus mealybug. Citrus mealybug feeds on plant sap and is commonly found in protected areas of the tree, including under the calyx of fruit, in clusters of leaves and within dense canopy growth. Mealybug infestations can reduce tree vigor, contaminate fruit with honeydew and sooty mold, …
Sandipa Gautam, University of California area citrus integrated pest management (IPM) advisor, issued an Extension advisory for California red scale (CRS). The scale is a key pest of citrus in the San Joaquin Valley. Key points of the advisory are as follows: CRAWLERS ARE ACTIVE The CRS life cycle starts as crawlers produced by overwintering females from the past season. …
The U.S. House Committee on Appropriations has included additional funds in the fiscal year 2027 Agriculture Appropriations bill for the U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS) citrus breeding program in Parlier, California. It is allocating an additional $500,000 in federal funding, on top of the $1.5 million previously granted, to expand the program into California. If approved, the program …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) in cooperation with the California Department of Food and Agriculture (CDFA) have expanded the area quarantined for sweet orange scab (SOS). The expansion is in the Irvine area of Orange County and in the La Puente area of Los Angeles County in California. QUARANTINE ACTIONS APHIS is expanding …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) and the California Department of Food and Agriculture (CDFA) recently expanded the La Mesa Mexican fruit fly (Mexfly) quarantine twice in San Diego County, California. On March 17, APHIS and CDFA expanded the quarantine following the confirmed detections on March 11 of one wild mated female Mexfly and …
Jesse Silva, vice president of sales at California’s Kings River Packing, recently discussed the spring and summer citrus season from a grower and consumer and perspective on the AgNet West Radio Network. His observations follow. GROWING CONDITIONS AND COSTS This year’s warmer growing conditions have created both challenges and opportunities. Larger fruit sizes and softer textures require careful handling, but …
Water management is a major challenge facing agriculture in California and other dry regions. A new University of California Riverside (UCR) system can map soil moisture tree by tree, so growers water only where and when it’s needed. The system, detailed in the journal Computers and Electronics in Agriculture, is the work of Elia Scudiero’s research group. Scudiero is associate …
Agriculture officials on March 5 established a Mexican fruit fly (Mexfly) quarantine in La Mesa, San Diego County, California, designated the La Mesa quarantine. On March 10 they expanded the quarantine. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) and the California Department of Food and Agriculture (CDFA) established the La Mesa quarantine in response to …
The March forecast for California’s 2025–26 Valencia orange crop is 17 million 40-pound cartons. The forecast is based on the results of the 2025–26 Valencia Orange Objective Measurement Survey, which was conducted from Jan. 10 to Feb. 10. The California Department of Food and Agriculture (CDFA), in cooperation with the U.S. Department of Agriculture National Agricultural Statistics Service, prepared the …
Two adult Asian citrus psyllid (ACP) samples were confirmed positive for Candidatus Liberibacter asiaticus (CLas) in two central California coastal counties on March 10, the Citrus Pest & Disease Prevention Program (CPDPP) reported. CLas is the bacterium that causes HLB. One sample was collected during a routine commodity survey in a commercial citrus grove in the Fillmore area of Ventura …
Agriculture officials announced the expansion of the sweet orange scab (SOS) quarantine and establishment of a new HLB quarantine area, both in California. SWEET ORANGE SCAB On March 11, the quarantine area for SOS in the Van Nuys area of Los Angeles County was expanded by 80 square miles. The U.S. Department of Agriculture Animal and Plant Health Inspection Service …
Agriculture officials have expanded the areas quarantined for sweet orange scab (SOS) in the Los Angeles and Villa Park areas of Los Angeles and Orange counties in California. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) in cooperation with the California Department of Food and Agriculture (CDFA) expanded the quarantine. SOS is a disease caused by …
Agriculture officials have expanded the areas quarantined for citrus greening disease (known as huanglongbing or HLB) in California. The quarantined area in the Corona area of Riverside County was expanded by 37 square miles. The San Juan Capistrano quarantined area of Orange County was expanded by 18 square miles. The actions were taken by the U.S. Department of Agriculture Animal …
Federal agriculture officials on Nov. 25 announced the expansions of the areas quarantined for sweet orange scab (SOS) and huanglongbing (HLB) diseases in California. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) in cooperation with the California Department of Food and Agriculture (CDFA) enacted the expansions. SOS The SOS quarantined area has been expanded by 5 …
An adult Asian citrus psyllid (ACP) sample collected from a rural residential property in Imperial County has tested positive for Candidatus Liberibacter asiaticus (CLas), the bacteria that causes huanglongbing (HLB). The ACP sample was collected from a citrus tree on Oct. 30 and was confirmed positive for CLas on Nov. 13. This is the first confirmed CLas-positive adult ACP found …
California’s huanglongbing (HLB, also known as citrus greening) quarantine and its Santa Clara Mediterranean fruit fly (Medfly) quarantine were recently expanded. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) in cooperation with the California Department of Food and Agriculture (CDFA) expanded the quarantines. HLB The HLB-quarantined area in Riverside County was expanded by 3 square miles. …
Citrus agricultural technology will be showcased on Dec. 5 in California. Six companies will demonstrate their technology during a VINE Connect Field Day at the University of California Agriculture and Natural Resources (UC ANR) Lindcove Research and Extension Center (REC) in Exeter. VINE Connect is a statewide commercialization program that helps proven ag tech companies bring their technologies to market …
