Nothing sends a gardener’s heart racing quite like the sight of a grasshopper silently munching through a prized leaf. These voracious jumpers can strip a row of beans or a bed of lettuce faster than any other common pest, leaving behind only ragged stems and frustration.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. I’ve spent thousands of hours cross-referencing label data, owner-test results, and horticultural research to separate the truly effective sprays and dusts from the weak formulas that waste your time and money.
Whether you’re fighting a sudden swarm or protecting a season’s worth of tomatoes, finding the best pest control for grasshoppers means balancing fast knockdown with long-lasting coverage that won’t harm your beneficial insects.
How To Choose The Best Pest Control For Grasshoppers
Grasshoppers are not like aphids or spider mites — they arrive fast, eat massively, and are highly mobile. A successful product must either kill on contact with a fast-acting formula or be ingested as they feed. You also need to consider whether the product will harm pollinators, how long it lasts after rain, and whether it covers the square footage of your garden.
Contact Killers vs. Stomach Poisons
Contact sprays work immediately when they hit the grasshopper’s body, but they lose effectiveness if the insect jumps away before being saturated. Stomach poisons (like those containing carbaryl or spinosad) are eaten along with treated leaves and kill the hopper after digestion. For heavy infestations, a stomach poison often provides more reliable results because the hoppers keep feeding even after the spray dries.
Residual Persistence and Rainfastness
Grasshopper activity peaks during hot, dry weather — exactly when you’re least likely to get a soaking rain. Many liquid concentrates bond to foliage and remain active for weeks if undisturbed. Diatomaceous earth, by contrast, works only while dry and must be reapplied after any rain or heavy dew. Check the label for rainfast timing so you don’t lose coverage after an afternoon shower.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Bonide Diatomaceous Earth | Powder | Non-toxic barrier protection | 5 lbs, kills within 48 hours | Amazon |
| Sevin Concentrate | Liquid | Broad garden coverage | 1 qt, treats over 100 insects | Amazon |
| Lost Coast Plant Therapy | Organic | Edible gardens with bees | 12 oz concentrate, bee-safe | Amazon |
| Ortho Bug B Gon | Ready-to-Spray | Large lawns and borders | 32 oz, treats 5,300 sq ft | Amazon |
| Hi-Yield Broad Use | Concentrate | Budget multi-pest control | 16 oz, treats 1,000 sq ft per 0.5 oz | Amazon |
In‑Depth Reviews
1. Bonide Diatomaceous Earth Crawling Insect Killer, 5 lbs
Bonide’s diatomaceous earth is a standout because it kills grasshoppers mechanically rather than chemically. The microscopic sharp edges of the fossilized diatoms cut through the insect’s waxy exoskeleton, causing dehydration and death within 48 hours. With grasshoppers listed specifically on the label, you know you’re using a product designed for this exact pest.
This 5-pound bag provides massive coverage for the price. You can apply it as a dry dust around the garden perimeter, directly on plant leaves, or mix it with water into a slurry for spray application. Because insects cannot develop immunity to physical action, this remains effective season after season — unlike chemical sprays that hoppers can eventually tolerate.
The main trade-off is moisture sensitivity. After any rain or heavy dew, the powder loses its sharp edge and must be reapplied. For dry-climate gardeners or those using it in covered raised beds, this is the most reliable, pet-safe, and environmentally gentle option available.
What works
- Kills grasshoppers by mechanical action, no chemical resistance
- Safe for use on vegetables and around livestock
- Massive 5-pound bag covers entire garden season
What doesn’t
- Requires reapplication after every rain or heavy dew
- Bag lacks a resealable zipper; needs clip or container
2. Sevin Concentrate Bug Killer, 1 Quart
Sevin’s reputation in the vegetable patch is well-earned. Its active ingredient, carbaryl, is a potent stomach poison that grasshoppers ingest as they chew treated foliage. Once consumed, it disrupts the insect’s nervous system and stops feeding almost immediately. Owners report dramatic reductions in Japanese beetles, worms in apples, and broad hopper damage within days.
The 1-quart concentrate requires mixing with water, but a little goes a very long way — the squeeze-and-measure bottle makes dosing simple and avoids mess. Sevin is labeled for hundreds of insect species, so it’s a true multi-purpose weapon if you’re fighting different pests simultaneously. Many gardeners report finally getting clean fruit after years of wormy harvests.
The downside is that carbaryl is broad-spectrum. It will kill beneficial insects, including bees, if applied to open blooms. Use it early in the morning or after blossoms have set, and avoid spraying flowering plants entirely if pollinators are active. For targeted hopper control in a mixed garden, this is the most proven chemical option.
What works
- Kills grasshoppers that eat treated foliage within hours
- Concentrated formula treats hundreds of square feet per bottle
- Squeeze-and-measure bottle eliminates mixing guesswork
What doesn’t
- Kills bees and other beneficials if applied to flowers
- Strong chemical smell requires careful application timing
3. Plant Therapy Lost Coast Organic Natural Plant Protection Concentrate, 12 oz
Lost Coast Plant Therapy is the premium organic choice for gardeners who refuse to sacrifice beneficial insects. It works by suffocating and dehydrating soft-bodied pests on contact, using food-grade oils rather than synthetic neurotoxins. Owners confirm it eliminates whiteflies, flea beetles, and spider mites, while leaving bees, ladybugs, and praying mantises unharmed — a huge relief for pollinator-focused growers.
The 12-ounce concentrate mixes with water to create 12 gallons of spray, making it surprisingly cost-effective given its price tier. The peppermint scent is a welcome change from the chemical reek of traditional insecticides, and it leaves no harmful residue on edible crops. It can be used right through the flowering stage without tainting the harvest.
Because it kills by contact and suffocation, thorough coverage is essential — you must hit the grasshoppers directly or coat the leaves they feed on. It won’t persist for weeks like a stomach poison, so reapplication every few days may be necessary during heavy pressure. For organic gardeners with a light to moderate hopper load, this is the cleanest solution.
What works
- Safe for bees, ladybugs, and praying mantises
- Pleasant peppermint scent, no harsh chemical odor
- Can be used on edibles through the flowering stage
What doesn’t
- Requires direct contact for knockdown; less residual action
- Premium price per ounce compared to synthetic concentrates
4. Ortho Bug B Gon Insect Killer for Lawns and Gardens, 32 oz
Ortho Bug B Gon is built for speed and convenience. The ready-to-spray bottle connects directly to your garden hose, so you can cover up to 5,300 square feet without mixing, measuring, or pumping. For large lawns, perimeter borders, or vegetable beds spread across a half-acre, this is the fastest way to blanket the entire area with insecticide.
The formula kills 235 listed insects, including grasshoppers, and starts working immediately on contact. It claims up to 6 months of protection for spiders, and while grasshoppers are more mobile, the residual barrier on foliage and soil surface does reduce reinfestation for weeks. Owners consistently report dramatic reductions in mosquitoes, Japanese beetles, and ticks after a single pass.
The obvious trade-off is that it’s non-selective. The product kills bees, butterflies, and other beneficial insects, so you must avoid spraying blooming plants and flower beds. The smell is also noticeable for a day or two after application. For a large-scale hopper outbreak where speed and coverage matter more than precision, this is the most pragmatic choice.
What works
- Hose-end sprayer covers 5,300 sq ft without mixing
- Kills on contact and provides residual protection for weeks
- Effective against 235 insect species in one pass
What doesn’t
- Toxic to bees and aquatic life; avoid blooms and water features
- Chemical smell lingers for 24-48 hours after spraying
5. Hi-Yield (32009) Indoor/Outdoor Broad Use Insecticide, 16 oz
Hi-Yield’s Broad Use Insecticide is the entry-level concentrate for gardeners who need a cheap, effective weapon against grasshoppers without overthinking it. The 16-ounce bottle mixes with water to treat up to 1,000 square feet per half-ounce, so a single bottle can handle a modest vegetable garden or a row of fruit trees for an entire season.
It controls ticks, mosquitoes, termites, fleas, and cockroaches alongside grasshoppers, making it a true utility player. Owners report instant knockdown on flying cockroaches and visible results within hours on foliage pests. It works in tank-type or power sprayers, giving you flexibility in application method.
The main drawbacks are the strong smell (reviewers note it’s potent enough to warrant spraying before leaving the house) and the need for caution around pets and children — the same reviewer who praised its effectiveness also got sick from residue on doorknobs. For a tight budget, it works, but you’ll want to apply it strategically and avoid overuse.
What works
- Very low cost per treatment; a little goes a long way
- Kills grasshoppers plus many other garden pests
- Works in both tank-type and power sprayers
What doesn’t
- Strong chemical odor requires careful application timing
- Poisonous to pets and humans if residue spreads indoors
Hardware & Specs Guide
Diatomaceous Earth Particle Size
Food-grade diatomaceous earth consists of microscopic, sharp-edged fossilized diatoms. The average particle size ranges from 10 to 200 microns. Smaller particles provide better adhesion to plant surfaces and remain airborne longer during dusting, while larger particles settle faster but deliver the same mechanical cutting action on contact with grasshopper exoskeletons.
Active Ingredient Concentration
Concentrates like Sevin (carbaryl at 22.5%) and Hi-Yield (a multi-chemical blend) require careful dilution ratios, typically 1 to 4 ounces per gallon of water. Ready-to-spray formulas like Ortho Bug B Gon come pre-mixed with an integrated hose-end dispenser. Organic concentrates like Lost Coast Plant Therapy use food-grade oils at a 1:16 dilution rate for 12 gallons of final spray.
FAQ
Will diatomaceous earth kill grasshoppers if they don’t touch it directly?
How long after spraying Sevin can I harvest vegetables?
Final Thoughts: The Verdict
For most gardeners, the pest control for grasshoppers winner is the Bonide Diatomaceous Earth because it kills mechanically without chemical resistance and is safe for vegetables and pets. If you want fast-acting knockdown of a heavy infestation, grab the Sevin Concentrate. And for organic, bee-safe protection in an edible garden, nothing beats the Lost Coast Plant Therapy.