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The California Department of Food and Agriculture declared a 77-square-mile quarantine covering Valley Center and surrounding areas on August 19 after discovering several Mexican fruit flies, an agricultural pest that can infect more than 50 types of fruit, including citrus, avocados, and a wide variety of tropical fruit.
CDFA officials said anyone growing or packing “host” fruit inside the quarantine area — commercially or in private yards — is urged not to move fruit off their properties.
Local residents and home gardeners affected by the quarantine should consume homegrown produce on-site, including canning, freezing, or juicing, and should not move host items from their property. Residents with questions are encouraged to call the consumer hotline at (800) 491-1899.
Fruit on the host list includes all types of tropical citrus but also includes certain varieties of avocados, guava, pomegranate, and many exotic fruits that are grown in the area.
As of Aug. 19, the quarantine area is bordered on the north by Pauma Valley; on the south by Lake Wohlford; on the west by the Moosa Canyon; and on the east by Rincon Reservation.
As the lead agency for quarantine in California, CDFA is the designated point of contact for quarantine inquiries.
CDFA will also conduct informational meetings with commercial growers, nurseries, packinghouses, and residents inside the quarantine area.
The County Department of Agriculture, Weights, and Measures supports CDFA during a quarantine to help prevent the spread of the detected pest and any expansion of the quarantine area.
AWM has alerted area agriculture stakeholders of the findings, including the San Diego County Farm Bureau, and as the host county, will assist CDFA with outreach and facilitation of grower meetings. The county will also work with growers adjacent to the quarantine area to help lessen the impact of a potential quarantine expansion and is responsible for regulating all pesticide use.
Mexican fruit flies, which are larger than a house fly, can wreak expensive agricultural destruction. Countywide, the 2020 crop value of MXFF hosts in San Diego County is $306 million. Within the quarantine boundaries, that value is $49M of San Diego County’s $1.8 billion total agricultural value.
Female flies inject their eggs inside ripening fruit. Hatched larvae then eat the fruit’s flesh, causing it to rot and drop to the ground. Larvae crawl out of the rotting fruit and into the ground to pupate. Adult flies emerge from the ground in 12 to 100-days, depending on temperatures. A single female fly can lay several thousand eggs in their lifetime.
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