To kill squash bugs effectively, here are several proven methods:
Manual Removal
- Hand-pick adult squash bugs and nymphs from plants and drop them into a bucket of soapy water to kill them
- Crush squash bug eggs found on the undersides of leaves to prevent hatching
- Use a shop vac or handheld vacuum to suck up squash bugs, then add diatomaceous earth inside the vacuum to kill them while trapped
Organic Sprays
- Spray infested plants with organic insecticidal soap every 3 to 5 days, focusing on leaves and stems but avoiding flowers to protect pollinators
- Homemade sprays using biodegradable detergent dish soap or diluted peppermint oil can suffocate or repel squash bugs but require frequent application
Cultural and Preventive Measures
- Keep the garden clean by removing debris and dead plants where squash bugs overwinter
- Plant squash varieties resistant to squash bugs, such as butternut, sweet cheese, and royal acorn squash
- Use companion planting with repellent plants like marigolds, nasturtiums, mint, garlic, onion, dill, radishes, and chives to deter squash bugs
- Place boards or shingles near plants overnight to attract adult bugs, then remove and destroy them in the morning
Chemical Options
- For severe infestations, use insecticides such as Sevin Insect Killer, which kills squash bugs on contact and can be applied up to one day before harvest
- Spray in the evening to avoid harming beneficial pollinators
Additional Tips
- Test any spray on a few leaves first to ensure it does not damage the plant
- Avoid composting infested plants at home; instead, dispose of them in municipal composting facilities to prevent spreading pests
Combining these methods-manual removal, organic sprays, cultural practices, and, if necessary, targeted insecticides-provides the best control over squash bugs and helps protect your squash plants from damage and disease
