Trying to control squash bugs can feel overwhelming once these pests become established in your vegetable garden. Killing adult squash bugs is difficult because they hide under leaves and vines and have a tough outer shell that is resistant to normal pesticides.

A squash bug (Anasa tristis) feeds on squash, zucchini, pumpkins, and other cucurbit plants by sucking plant sap, which causes yellowing, wilting, and reduced harvests.

This guide focuses on natural methods of controlling squash bugs once they appear, including several types of manual removal and garden treatments such as neem oil, insecticidal soap, and diatomaceous earth. For long-term prevention strategies, please see my guide to preventing squash bugs.

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Why squash bugs are harmful

Squash bugs can weaken and destroy squash plants quickly, especially during warm weather and on young plants.

Heavy infestations reduce plant vigor, damage vines and leaves, and may lead to smaller harvests or collapsed plants if left untreated.

What to do when squash bugs appear

Controlling a severe squash bug infestation requires a combination of manual removal and targeted treatments. There are several effective manual methods to remove squash bugs and their eggs.

Hand-picking squash bugs

Inspect the undersides of your squash plant leaves and the base of your plants every 2 days.
This is especially important in late spring, when squash bug eggs are commonly laid.
The eggs are laid in a cluster where the veins of the leaves form a V shape.
Crush any squash bug eggs with gloved fingers as you find them.
Don’t forget to inspect other cucurbits such as cucumbers, melons, and pumpkins. Squash bugs love them, too!

Sticky tape removal

Wrap duct tape around your hand with the sticky side out.
Turn the leaves over and press the tape against the squash bug eggs.
They will stick to the tape, and you can discard the bugs and the tape.

Trap boards

Lay flat, wooden boards on the soil near your plants. Squash bugs will hide under the boards at night.
In the morning, flip the boards over and press on the bugs to kill them.

Cardboard or cloth traps

These function like a portable version of the trap board system.

Lay cardboard, burlap, or old pieces of cloth around the base of your plants.
Check and remove any bugs that gather under the traps and dispose of them.
Move the cloth around the garden to reset hiding spots.

Knock bugs into soapy water

Fill a bucket with water that is mixed with a few drops of liquid dish soap.
Locate adults or nymphs on the plants.
Drop the bugs into the water to kill them.

Vacuum removal for heavy infestations

Use a small handheld vacuum cleaner.
Vacuum clusters of bugs or eggs on stems and undersides of the leaves.
Empty the bugs and squash bug eggs into a bucket of soapy water immediately.

Use water to flush out squash bugs

Use a hose to spray a heavy stream of water at the base of your squash plants.
This will startle hiding squash bugs and force them to crawl upwards.
It will make them easier to locate and pick the bugs from your plant.

Soil surface disturbance

Gently disturb the soil around the base of your plants.
Lift and check any debris manually for bugs.
This exposes hiding adults to predators or hand-removal.

Barrier interception

Wrap a narrow strip of sticky insect tape around the lower stem of the plant.
This slows the squash bugs from climbing upward.
It also concentrates them closer to the base of the plants, making them easier to remove.

Night-time inspection and removal

Squash bugs often feed and cluster at night or early in the morning. Looking for them when it’s dark increases the success rate vs daytime searching.

Use a flashlight after dark.
Check the stems and leaf junctions.
Hand-remove and kill any adults you find

Garden treatments for squash bugs

As we have discovered, squash bug control requires a multi-faceted approach. Because adult squash bugs have a tough protective outer shell and often hide beneath leaves and vines, spray treatments are generally less effective against adults than against newly hatched nymphs.

Three commonly used natural squash bug treatments used to kill nymphs are neem oil, insecticidal soap, and diatomaceous earth.

Neem oil for squash bugs

Neem oil works to control squash bugs by disrupting their feeding and developmental cycles.

It is effective against eggs and nymphs but not adult squash bugs.
Works best for early infestations.
Spray in the morning or late evening.
Spray thoroughly, especially on the undersides of leaves where eggs and young nymphs are commonly found.
Reapply every 7-10 days and after heavy rain.

Insecticidal soap for squash bugs

Insecticidal soap is an effective, organic method for killing squash bug nymphs on contact. It penetrates the bugs’ protective waxy layer, causing them to become dehydrated.

Because insecticidal soap works only on contact, spray thoroughly and repeat every 7–10 days as new eggs hatch.
Most effective against newly hatched nymphs with soft bodies. It does not work well on adult squash bugs.
For non-blooming plants, spray in the morning on the undersides of the leaves.
If plants are blooming, spray in the evening when honeybees are not active.

Diatomaceous earth for squash bugs

Diatomaceous earth (DE) is made from the fossilized remains of tiny, aquatic organisms called diatoms. This natural powder scratches and dries the protective outer coating of squash bug nymphs.

Most effective against nymphs, but does not get rid of adult squash bugs.
Use only food-grade diatomaceous earth.
Wear a mask when applying DE to keep from inhaling it.
Sprinkle the powder around the base of the plants and on the stems.
Dust DE on the undersides of the leaves.
Avoid getting the powder on the blossoms of squash plants, since DE can also kill pollinators.
Reapply after rain or heavy watering.

These treatments are most effective against nymphs and early-stage infestations. Adult squash bugs are more difficult to control and are often better managed with manual removal methods.

Squash bug control checklist

You can print a checklist for controlling squash bugs as high-resolution JPGs or PDFs by using the links below:

Printing instructions:

Select portrait orientation and “fit to page” on your printer settings for a full-page printout.

You can also print out the checklist showing how to get rid of squash bugs from the project card at the bottom of this page. Scroll down to the card and press “print”.

Can squash plants recover after squash bug damage?

Yes, squash plants can recover after an infestation once the squash bug population has been controlled or significantly reduced. However, the outcome depends on the severity of the infestation. Heavy infestations can cause significant wilting or leaf yellowing.

Mild damage: recovery is likely

Light wilting or yellowing of plants
Continued healthy new growth
Plants are likely to recover

Moderate damage: partial recovery is likely

Your squash plants may have a reduced yield
Vines may be stunted
Recovery depends on overall plant health and the timing of the infestation

Severe damage: recovery not likely

Vines may be collapsed
Extensive egg clusters and nymphs are present throughout the plant
No new growth is evident
Removal may prevent reinfestation, but recovery is unlikely

Protip: Removing heavily infested plants can help prevent squash bugs from spreading to nearby healthy plants.

How to keep squash bug infestations from occurring in the future

If squash bugs return year after year, prevention strategies can reduce the chances of repeated infestations.

Techniques for preventing squash bugs work best before their populations are established. These techniques focus on timing, garden cleanup, physical barriers, and ongoing monitoring.

Remove garden debris after harvest
Practice crop rotation with squash crops between seasons
Avoid wood mulch, which harbors squash bugs
Use row covers early in the season
Monitor plants before populations build

If you are looking for practical ways to stop squash bugs before they become established, see our complete guide to squash bug prevention. It covers crop rotation, row covers, sanitation, monitoring, and other prevention methods.

Use companion plants for squash to repel squash bugs

Certain herbs, flowers, and trap crops are often incorporated into a squash bug management strategy.

While these plants won’t eliminate squash bugs on their own, they may help support natural pest control efforts by masking plant odors, attracting beneficial insects, or serving as trap crops.

For a complete guide, see our article on plants that repel squash bugs.

Share this post about controlling squash bugs on X

If you enjoyed learning what kills squash bugs, why not share this guide with a gardening friend? Here is a post to get you started:

Are squash bugs taking over your zucchini and squash plants? 🐞🌱 Don’t give up yet! Head to The Gardening Cook to discover 13 practical ways to control squash bugs, from manual removal and trap methods to neem oil, insecticidal soap,… Share on X

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To remind yourself of this post on natural ways to kill squash bugs, pin this image to your gardening board on Pinterest so that you can easily find it later.

Admin note: This post first appeared on my blog in June of 2013. I have updated the post with additional information and new photos, a squash bug control checklist, and a video for you to enjoy.

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Controlling Squash Bugs Printable

4.7 Stars (7 Reviews)

This printable gives a handy chart of tips to rid your yard of squash bugs for good.

Prep Time 5 minutes

Total Time 5 minutes

Difficulty easy

Estimated Cost $1

Materials

Computer paper

Tools

Computer
Printer

Instructions

Load your paper into your printer.
Using the print function on this card will give you a squash bug control checklist that fills about ¾ of an 8.5 x 11-inch sheet of paper.
Choose portrait layout and, if possible, "fit to page" (or 125%) in your settings.
Prefer full-page printing? You can also print the guide as a high-resolution file using your browser’s print feature: (PDF) | (JPG).
Please note that creating free printables can be a time-consuming process. This squash bug checklist is for personal use only. If you are sharing it (and thank you for that!), please link directly to this post, rather than to the actual image. We appreciate your help in supporting the site.
This printable may not be used for any retail purpose or for mass distribution.

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Rose

Tuesday 8th of August 2023

Hi Carol thank you for the tips I've been able to somewhat manage squash bugs this year with dish soap water and a mix of essential oils and I spray approximately every 2 weeks but I still find eggs so I'm going to try neem oil since I haven't tried that yet. But yes this year is probably the most on top of them I've ever been and I think it's from clearing out my garden in the fall and then torching the ground in the spring it's made a huge difference

cathy

Thursday 13th of April 2023

I have dealt a lot with squash bugs. Best way is hand pick & remove eggs. The eggs are usually nearly laid, slightly oblong and reddish brown. Best time is early or late afternoon. Water plants ...that drives them up to climb ( they don't like getting wet) and will force them to move & be easier to spot the adults. The younger nymphs are white or pale, and are normally clustered. Wear gloves (cuz squash leaves are prickly) & it will be less gross to crush the bugs. Best deterrent. You can also plant one plant earlier to be a trap plant and attract the bugs to it. . I usually have ones that sprouts on its own, so I use it.

Susie C.

Wednesday 27th of July 2022

Thank you SO much for all this information! I have never even heard of squash bugs before and this is our second year with them 😠! I have tried some of these tips already, but after reading all of this, I think I may be able to get a handle on them for next year! Thank you again!!

Michael Ross

Monday 30th of August 2021

My yellow squash were infested with squash bugs and powdery mildew. The squash continued to grow but they grew white! Are they still edible white?

Carol Speake

There is a disease that can happen by eating some plants in the squash family that have been infected by disease. It is called toxic squash syndrome. IF you bite into squash that is extremely bitter, the plant may have been infected.

Jerry Meyer

Sunday 8th of August 2021

I use tulle cloth to cover my Zucchini plants. It works really well. The biggest problem is that the cloth tears very easily. Then I have to sow the hole closed.

Secondly, I have to be the bee and pollinate the flowers myself. It's not a big deal. In order to cover the Zucchini plants I bought some 1/2" PVC pipe and bent them over my raised beds about every 3' forming a half hoop.

I also put the 1/2" PVC pipe horizontally on top of and over my half hoops and tied this horizontal PVC pipe in place with some light string. My raised beds are built our of 2" x 6" treated boards. On top of these boards I nailed into place a 3/8" x 1.5" strips of treated wood set off center. You will have to rip some 2"x6" treated boards to get the desired strips. To keep this cloth in place I used paper binders that would open to the thickness of the offset strips and clipped the cloth to these strips.

The tulle cloth can be purchased from a wholesale house much cheaper than a fabric shop; and, it comes in 9' widths. This seems to be the right width for a 4' wide raised bed. Over time the cloth does stretch. The squash bugs and stink bugs seems to be controlled. It is now early August and the plants do not seem to be bother by these bugs. However, smaller bugs like aphids can still be a problem. To set this system up can be a little costly. However, gardening is a hobby. Hobbies do get to be expensive.

Best of luck.

Monday 9th of August 2021

Thanks for the tips, Jerry.