Millions of sterile male Mexican fruit flies are set to be released across parts of San Diego County after one mated female fruit fly was detected around Spring Valley, as regulators expand quarantines and use a sterile insect technique to stop the pest from r
By the time a single mated female Mexican fruit fly was detected around Spring Valley, regulators had already been bracing for the harder part: keeping the population from multiplying.
Now. millions of sterile male Mexican fruit flies are planned for release over parts of San Diego County. according to California Department of Food and Agriculture officials. The program uses a “sterile insect technique. ” in which sterile male flies are dispersed—either from the air or the ground—to mate with wild female flies. preventing the reproduction process.
The state department’s news release did not say when the releases would begin or end.
For residents inside the affected zone. the work isn’t just about insects—it’s about protecting local food and the rules that follow once a quarantine is in place. Mexican fruit flies are described by the California Department of Food and Agriculture as among the world’s most destructive pests when laying eggs. capable of destroying or damaging crops including apples. grapefruits. avocados. peaches and pears.
This latest effort comes after multiple Mexican fruit flies were found in La Mesa, prompting a quarantine placed in March. In a release last week, the quarantine area in San Diego County was expanded by 19 square miles. The quarantine now borders El Cajon. Proctor Valley. Lemon Grove and McGinty Mountain. bringing the total area under quarantine to 76 square miles.
In the areas under the new release plan, regulators expect a release rate of about 250,000 male Mexican fruit flies per square mile per week. The male fruit fly releases are scheduled to occur in an area described as “50 square miles around the infestation.”
The state department says the Mexican fruit fly enters California when travelers bring fruits or vegetables from regions where the pest is already present.
The insect itself is large enough to draw notice. An adult Mexican fruit fly has a 1.0-cm-long body and is larger than the average housefly. Originally native to Mexico, it has also been detected in Belize, Costa Rica, South Texas’ lower Rio Grande Valley, El Salvador and Guatamala.
Female Mexican fruit flies lay thousands of eggs during their lifetime. Once those eggs hatch into larvae inside the fruit, the rotting process begins.
Regulators also point out that the pest can show up beyond fruit: Mexican fruit flies are known to host inside nuts and vegetables, according to the USDA’s Animal and Plant Health Inspection Service.
Quarantines can ripple into everyday decisions for people who grow and sell fruit. and also for residents in the affected areas. Agriculture regulators advise home gardeners to either consume homegrown produce on site or not move it at all from the property. aiming to prevent the fly from spreading to nearby regions.
San Diego County Spring Valley sterile insect technique Mexican fruit fly quarantine California Department of Food and Agriculture La Mesa El Cajon Lemon Grove Proctor Valley McGinty Mountain USDA APHIS
Sterile flies?? So they’re basically carpet bombing bugs with math.
I swear they said once and then it just spreads anyway. If it’s only one mated female found, how are we already at millions of flies? Sounds like overkill to me.
Wait so they release male fruit flies that can’t reproduce, but the quarantine is still 76 square miles? That part confuses me. Like if the males are sterile, why expand the rules so much? Also La Mesa already had them so I’m not buying the “we just detected one” story.
This is wild, but I guess I’d rather have tiny bugs than ruined avocados lol. Still, why not just spray or something instead of dropping millions from the air? And they didn’t even say when it starts/ends which is super convenient for whoever’s planning it.