A simple homemade grasshopper trap can be built with molasses, water, and a shallow container. Grasshoppers are strongly attracted to the smell of molasses, and a basic trap using this bait can catch dozens overnight. For larger infestations, combining traps with bait products gives you the best shot at real population control.
The Molasses Trap
The most common DIY grasshopper trap uses a 10% molasses solution: roughly one part molasses to nine parts water, mixed in a shallow container like a baking pan, jar, or buried bucket. Grasshoppers are drawn to the sweet smell, jump or crawl in, and drown. Adding a thin layer of canola oil on the surface of the water makes the trap more effective in two ways. It prevents grasshoppers from escaping once they land in the liquid, and it discourages bees and wasps from investigating the sweet smell.
Place these traps in open, sunny spots where you’ve seen grasshoppers congregating. Near garden borders, along fence lines, and at the edges of weedy areas are all good choices. Empty and refill the traps every few days, or sooner if they fill up with insects or debris. Rain will dilute the solution, so refresh it after storms.
The Mirror Trap
A lesser-known approach uses a mirror propped up near where grasshoppers tend to rest, with a dish of soapy water placed directly below it. Grasshoppers see their reflection, jump toward it, hit the glass, and fall into the soapy water. The soap breaks the surface tension so they can’t climb back out. This method works best for a specific wall or fence where you consistently see grasshoppers gathering, rather than as a broad-area solution.
Wheat Bran Baits
For serious infestations, scattered bait is more effective than passive traps because it covers a much larger area. Wheat bran baits work like a trap in the sense that grasshoppers actively seek them out and feed on them. Two main types are available.
Chemical baits use carbaryl as the active ingredient. Brands like Sevin 5 Bait provide fast knockdown. In field trials, all tested insecticide treatments significantly reduced grasshopper numbers within seven days compared to untreated areas, and prevented measurable crop loss.
Biological baits contain Nosema locustae, a naturally occurring microorganism that infects grasshoppers from the inside. It attacks the fat stores and internal organs that grasshoppers depend on for energy. Products sold under names like NOLO Bait and Semaspore Bait use this pathogen mixed into wheat bran. The biological approach is slower: typical results show 30 to 50 percent mortality, with 20 to 50 percent of surviving grasshoppers also carrying the infection. Under ideal conditions, studies have documented up to 60 percent mortality and near-total infection rates among survivors after about 12 weeks. The infected survivors eat less, reproduce poorly, and spread the pathogen to other grasshoppers that feed on their remains.
Both types of bait should be spread evenly across the areas where grasshoppers are feeding and breeding. You’ll need to reapply after rain or irrigation, since moisture breaks down the bait.
Where to Place Traps and Bait
Grasshoppers don’t typically start in your garden. They hatch in undisturbed ground like open fields, roadsides, drainage ditches, hedgerows, and weedy vacant lots, then migrate into gardens and crops as they mature. Placing traps and bait at these boundary areas, the edges between wild land and your yard, intercepts grasshoppers before they reach your plants. Focus on roadsides, fence lines, ditch banks, and the borders between your property and any open space.
If you’re only placing traps inside your garden, you’re catching grasshoppers that have already arrived and are already feeding. Perimeter placement is far more effective at reducing the number that make it in.
Timing Makes a Big Difference
Young grasshoppers (nymphs) are far easier to control than adults. Early in their development, they stay close to where they hatched and can’t fly. Once they reach their later nymph stages and adulthood, they become highly mobile, harder to trap, and more resistant to both baits and sprays. In most regions, this means late spring to early summer is the window to act. By the time you’re seeing large, flying adult grasshoppers chewing through your tomatoes in August, you’ve missed the easiest control window.
Watch for tiny nymphs (they look like miniature wingless adults) in May or June in open, sunny areas near your property. That’s when traps and baits give you the most return for your effort.
Combining Methods for Best Results
No single grasshopper trap eliminates an entire population. Molasses traps catch individuals but won’t dent a large outbreak on their own. Biological baits reduce numbers by roughly a third in the short term, with continued decline over the season as the infection spreads. Chemical baits act faster but need reapplication and affect other insects too.
The most practical approach for a home garden combines a few strategies: molasses traps near garden beds to catch active grasshoppers, biological bait scattered in the surrounding weedy or open areas where nymphs are hatching, and row covers or physical barriers on your most valuable plants during peak season. Tall grass and weedy borders near your garden give grasshoppers shelter and breeding habitat, so mowing those areas short removes cover and makes your traps and baits more effective.