Most people don’t seem to know that in this context “application” and “control” are simply euphemisms for “poison.” A friend once mentioned to me that she’d love to put up a nest box for bluebirds, and I offered to help her choose a good box and a safe spot for it in her yard, explaining that she would also need to tell her yard service to stop spraying. “I had no idea those guys were spraying,” she said.

To enjoy a lush green lawn or to sit on your patio without being eaten alive by mosquitoes doesn’t seem like too much to ask unless you actually know that insecticides designed to kill mosquitoes will also kill every other kind of insect: earthworms and caterpillars, spiders and mites, honeybees and butterflies, native bees and lightning bugs. Unless you actually know that herbicides also kill insects when they ingest the poisoned plants.

The global insect die-off is so precipitous that, if the trend continues, there will be no insects left a hundred years from now. That’s a problem for more than the bugs themselves: Insects are responsible for pollinating roughly 75 percent of all flowering plants, including one-third of the human world’s food supply.

They form the basis of much of the animal world’s food supply, as well. When we poison the bugs and the weeds, we are also poisoning the turtles and tree frogs, the bats and screech owls, the songbirds and skinks.

“If insect species losses cannot be halted, this will have catastrophic consequences for both the planet’s ecosystems and for the survival of mankind,” Francisco Sánchez-Bayo of the University of Sydney, Australia, told The Guardian last year.

Lawn chemicals are not, by themselves, the cause of the insect apocalypse, of course. Heat waves can render male insects sterile; loss of habitat can cause precipitous population declines; agricultural pesticides kill land insects and, by way of runoff into the nation’s waterways, aquatic insects, as well.

As individuals, we can help to slow such trends, but we don’t have the power to reverse them. Changing the way we think about our own yards is the only thing we have complete control over. And since homeowners use up 10 times more pesticide per acre than farmers do, changing the way we think about our yards can make a huge difference to our fellow creatures.

It can make a huge difference to our own health, too: As the Garden Club of America notes in its Great Healthy Yard Project, synthetic pesticides are endocrine disrupters linked to an array of human health problems, including autism, A.D.H.D., diabetes and cancer. So many people have invested so completely in the chemical control of the outdoors that every subdivision in this country might as well be declared a Superfund site.

Changing our relationship to our yards is simple: Just don’t spray. Let the tiny wildflowers take root within the grass. Use an oscillating fan to keep the mosquitoes away. Tug the weeds out of the flower bed with your own hands and feel the benefit of a natural antidepressant at the same time. Trust the natural world to perform its own insect control, and watch the songbirds and the tree frogs and the box turtles and the friendly garter snakes return to their homes among us.

Because butterflies and bluebirds don’t respect property lines, our best hope is to make this simple change a community effort. For 25 years, my husband and I have been trying to create a wildlife sanctuary of this half-acre lot, planting native flowers for the bees and the butterflies, leaving the garden messy as a safe place for overwintering insects.

Despite our best efforts, our yard is being visibly changed anyway. Fewer birds. Fewer insects. Fewer everything. Half an acre, it turns out, is not enough to sustain wildlife unless the other half-acre lots are nature-friendly, too.

It’s spring now, and nearly every day I get a flier in the mail advertising a yard service or a mosquito-control company. I will never poison this yard, but I save the fliers anyway, as a reminder of what we’re up against. I keep them next to an eastern swallowtail butterfly that my 91-year-old father-in-law found dead on the sidewalk. He saved it for me because he knows how many flowers I’ve planted over the years to feed the pollinators.

I keep that poor dead butterfly, even though it breaks my heart, because I know what it cost my father-in-law to bring it to me. How he had to lock the brakes on his walker, hold onto one of the handles and stoop on arthritic knees to get to the ground. How gently he had to pick up the butterfly to keep from crumbling its wings into powder. How carefully he set it in the basket of the walker to protect it.

My father-in-law didn’t know that the time for protection had passed. The butterfly he found is perfect, unbattered by age or struggle. It was healthy and strong until someone sprayed for mosquitoes, or weeds, and killed it, too.

Margaret Renkl is a contributing opinion writer who covers flora, fauna, politics and culture in the American South. She is the author of “Late Migrations: A Natural History of Love and Loss.”