Grasshoppers are the pest where the most useful thing we can tell you is where the limits are.
This is a field problem that reaches your garden
Wisconsin has several hundred grasshopper species and only a handful do the damage: the differential, redlegged, twostriped and migratory grasshoppers account for nearly all of it.
None of them are household insects. They do not breed in buildings, they cannot feed on anything in a house, and an individual indoors in August came through an open door by accident and will be dead within days.
What they are is an edge problem. Damage starts on the side of the property facing pasture, hay ground, a ditch bank or a roadside, and works inward.
Why some years are so much worse
Grasshopper numbers are normally held down by fungal pathogens, and those pathogens need humidity to spread.
A hot, dry summer removes the brake. Populations that would have crashed instead climb, and two dry summers in a row produce the outbreak years people remember for a decade. A wet June does more for grasshopper control than anything that can be sprayed.
This is worth internalising because it reframes the problem: an outbreak year is weather, not something you failed to prevent, and it will end when the weather changes.
Where they actually come from
Females lay egg pods in undisturbed soil in late summer — ground that will not be tilled or disturbed before spring:
- Ditch banks and roadside verges
- Fence rows
- Field margins and headlands
- Pasture
- The unmown strip at the back of the lot
Eggs overwinter there and hatch the following spring. On a rural property the single most useful thing to establish is which margin they are hatching off, because that determines whether anything can be done and who would have to do it.
What treatment can and cannot do
Here is the honest division.
It can protect a specific planting, knock down a heavy edge, and make a real difference if applied to the margin band early, while they are still nymphs and before they can fly well.
It cannot give you a grasshopper-free lawn in an outbreak year on an exposed property. Adults are strong fliers and reinvade continuously from surrounding land. A treated yard ringed by hay and roadside is being restocked daily, and no product changes that.
If somebody quotes you a yard treatment for an outbreak year without mentioning reinvasion, they are selling you a repeat visit.
What actually works better
Treat early, not late. Nymphs are far more susceptible than adults. An outbreak dealt with in early summer goes much better than the same one in August.
Treat the margin, not the lawn. If the hatch ground is yours, an early band treatment along it is the highest-value application available. If it belongs to somebody else, that is the limit and it should be said out loud before any money changes hands.
Manage the egg-laying ground you own. Mowing and disturbing those margins reduces next spring’s hatch on your land.
Use row cover on what matters. For a vegetable bed or a young planting, physical exclusion is more reliable than chemistry and cheaper.
And if it is actually crickets
Easy to confuse and a completely different job. Crickets have long thread-like antennae, are mostly nocturnal, and genuinely do move into basements, crawlspaces and garages every fall. If what you have is indoors, chirping, and arriving in September, start there instead.
For the garden and field side, see residential pest control and the dairy farm pest control guide for the agricultural angle.