How a San Jose backyard feeds a kitchen problem
Most guides treat fruit flies as a purely indoor pest. That works in a cold climate. It does not work here, where an unpicked plum tree or a row of raspberry canes runs its own population from June into October. Spotted-wing drosophila is the reason. UC IPM counts up to ten generations a year on coastal berries and cherries, and unlike its common cousin this fly lays into fruit that is still firm and ripening. So the fruit you pick can already carry eggs, and the fruit you leave on the ground becomes a nursery that lasts for weeks. The practical steps are unglamorous. Pick fruit at ripeness rather than a few days later. Rake up drops at least weekly during the season and take them off the property rather than adding them to a bin that sits by the back door. If you compost, bury fruit waste rather than leaving it on top. Do that and the indoor side gets much easier, because you are no longer restocking the house every time someone brings in a bowl of berries.
Small kitchens, shared bins, and condo plumbing
A large share of San Jose residents live stacked rather than spread out, and that shapes where the breeding material sits. Counter space is short, so produce stays out. Storage is short, so recycling piles up in a corner. Trash goes to a shared room down the hall rather than a cart in a driveway. Each of those is an opportunity for a fly. The recycling corner in particular does more damage than people expect, because a rinsed bottle is inert and an unrinsed one is a brewery. Wine bottles are the worst offenders and the most common in this city. The shared side is harder. If the source is a trash room, a chute, or a dried out floor drain in a common area, cleaning your own unit will not fix it. Take the two week test seriously: clean thoroughly, count flies daily, and if the count does not fall, you have the evidence to hand to management. Ask for a specific inspection of the waste room and the building drains, in writing, rather than a general request to spray the hallway.
What a useful first visit looks like
The visit should start with a flashlight rather than a canister. A technician who names the breeding site before treating is doing the job; one who treats first is selling a product. Expect the inspection to cover the space behind and under the refrigerator, dishwasher, and stove, the drip pan, the sink drain and disposal splash guard, the recycling and compost containers, and any beverage equipment. In a house with fruit trees the yard should be part of the walk, with attention to drops and green waste storage. What you should get back is a list of specific locations and a division of labor: which items you will handle, which the provider will, and when they will return. Two weeks between visits matches the biology, since the University of Maryland Extension puts the cycle at eight to ten days. Products belong at the end. UC IPM's own management list starts with sanitation and traps before it reaches spinosad or pyrethrins, and a good provider will follow the same order in your kitchen.
Twelve months of fruit flies in the valley
January and February are quiet outdoors. Anything active is indoors, living on produce in a warm kitchen, and it usually traces to a single forgotten item in a cabinet or a bin that has not been washed in a while. March through May is buildup. Warming weather restarts the outdoor population from overwintering pupae on the ground, and early fruit begins to set. Indoors, numbers stay low unless there is a standing source. June through September is the heavy stretch. Cherries, berries, and figs come in, summer highs around 82F keep development fast without cooking anything, and every bowl of fruit brought inside is a possible introduction. This is when most San Jose households first notice the cloud over the sink. October and November bring the national indoor peak the University of Maryland Extension describes, and here it lands on top of late figs and fallen fruit still on the ground. December cools things off outside, but a heated kitchen with a bag of ripe pears keeps going regardless of what the weather does.
Comparing quotes without overpaying
Fly work is priced on labor and visits, not on chemicals, so the useful questions are about time and scope. Ask whether the inspection includes moving appliances, whether the yard is covered, whether drain treatment is part of the number or an add on, and how many visits the price includes. Then ask what happens if flies are still there in three weeks, and get the answer in writing. A one visit spray quote will nearly always read cheapest. It also tends to end with a second call, because whatever was pupating on the day of service emerges days later and the cloud is back. A quote with two or three visits spaced roughly two weeks apart matches how the insect actually works. One more question separates the serious from the rest: what do you need me to do before you arrive? A provider planning a real inspection will ask you to clear produce, empty bins, and dry the floors so the findings mean something.