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Rat infestation in garden: Can I eat my produce? #847659

Asked August 28, 2023, 2:57 PM EDT

I am experiencing an unprecedented rat infestation in my entire vegetable garden. I am starting to manage it with snap traps and keeping food sources under control. But the fact is, rats are nibbling on my tomatoes, peppers and herbs. They seem to especially love basil roots. Can I safely eat my garden produce? If so should I wash it using a particular protocol? (suggestion: make extension questions searchable)

Multnomah County Oregon

Expert Response


You have a good question and there is not a definite yes or no answer.  For people that are in the at risk group it might be risky to eat the produce.  For heathy individuals it is a personal choice.  If you do, you need to cut off the chewed portion and then wash the produce well in several rinses of running water.  For tomatoes and other vegetables and fruits with peels, wash and then peel.  

Better yet cook it.  The bacteria such as E coli or Salmonella are destroyed by cooking.  If the nibbles are just a little, it is much safer than if the rodent consumed a lot of your produce, then it probably better to compost.  

Remember, bacteria are microscopic and stick to the produce exterior or folds, stem scars or injuries and are not fully removed with washing. While washing will remove visible soil, sand and big debris, it is not guaranteed to remove all microscopic bacteria.

Personally when I have produced that has been eaten by critters and it isn't too bad, I generously cut off the part that was nibbled on, wash thoroughly and then use it in something cooked.  I try not to consume it raw. 

Hope that helps.

If you have other food preservation questions you might like to call the OSU Food Preservation/Safety Hotline open M-F from
9 am-4pm. Certified Master Food Preservers are available to answer your question. the number is <personal data hidden>.

Thanks for using Ask Extension

Nellie Oehler 




An Ask Extension Expert Replied August 28, 2023, 6:43 PM EDT
Hi Nellie,
Thank you so much for getting back with me. We are now wondering if we are dealing with a culprit other than rats. Here are the clues, in case you have any thoughts:
  • Beds and pots are mostly raised about 24" off the ground.
  • The holes/burrows in all my garden beds, and even large pots, are pretty big - 2-4" inches in diameter.
  • The animal(s) are doing major excavation, totally moving the soil around in the beds by inches and feet, but not typical mole hills. 
  • In the case of the basil, the animal often burrows, eats the roots and leaves the plant dead in the pot/bed.
  • We have set a few rat traps with peanut butter every night for the past week. A trap has sprung a couple times, but the peanut butter remains and no rat. For the most part the traps are going unsprung.
The pictures aren't a lot of help, but here are a couple. Do we still suspect rats? Have you received other similar complaints from local gardeners?

Our next step is to put out bigger rat traps (so far using the black plastic ones) and a have-a-heart trap.

Susan

CF1850A1-0748-480B-9E41-E8ADD51173B9.jpeg
44A8A513-665B-4ED0-B3A1-30FB354930AE.jpeg


16E95FFF-232A-4C6E-BF96-67B69E17219B.jpeg




On Mon, Aug 28, 2023 at 3:43 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied September 07, 2023, 3:53 PM EDT
Your garden looks like my front yard. smile. I have a huge gopher and vole problem at the moment as well.  I am not sure what your critter is but showed it to one of my Master Gardener friends who was here visiting, and she thought you might have a couple different critters.  Since they were not eating peanut butter, it probably wasn't rats or mice.   They love peanut butter.  She said your soil look like it had a lot of compost so makes it easy digging for the critters.  If you had gophers or moles then the voles can use those holes for easy access and they don't leave mounds.   Gophers and moles will eat the roots and kill the plants.  Moles like insects, worms etc and do not eat plants.  Might try gopher traps and see what happens or the mole/gopher repellant.  

Do you have hardware cloth under your raised beds.  It really helps keep the critters out.  It comes in a roll and you nail it to the underside of your raised beds and then put the soil on top of it.  They can't dig through when they burrow under the beds.  Works great to keep them out, especially if it is underground critters.  I had to do it to all of my beds, and it works great.  

I have sent the photos and your explanation to one of my very knowledgeable Master Gardeners.  If she responds with a different answer, I will let you know.  Just don't feel alone there are lots of critters out there that are hungry this year.  We just discovered that something ate all our carrots at the school garden over the weekend.  We think it is voles but who knows.  Of course, we babied them all summer and just as the kids return to school they are gone.  

Sorry I can't give a definite answer but can sure relate.  It happens to all of us.  

Nellie
An Ask Extension Expert Replied September 07, 2023, 6:35 PM EDT
Thank you so much for this reply! I feel less alone. :) I will consider lining my beds - it will be a huge undertaking because they are very large. But something I can chip away at over the fall. An interesting point, one of the raised beds is actually a bamboo planter that we repurposed to grow peppers. So it has a super-dooper plastic bamboo lining all around. So whatever is in there is climbing in from the top. 
 
Will also try your other suggestions re traps and repellents. 

Sure appreciate all you at the OSU extension service. Always quick, helpful replies over the years. 

Let me know if you hear anything from the Master Gardener and condolences on your school carrots. :( 

On Thu, Sep 7, 2023 at 3:35 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied September 07, 2023, 8:07 PM EDT
Still trying to get a solid ID on my garden invader! Any new thoughts appreciated! 
Susan in SW Portland

1. Whatever my invader is has eaten almost all my ripe tomatoes. The sweeter the better!
2. We have peppers in a bamboo planter that is completely lined with impervious lining. It is invaded, so this tells me the culprit is not only burrowing, but going in from the top.
3. Mouse traps and rat traps baited with peanut butter and/or ripe tomato have yielded nothing, even when placed right by holes.
4. Saturated an area with castor oil and dawn solution. No impact, invasion got worse if anything.

Here are a few photos:

IMG_9194.JPG
My best, sweetest variety - Momoto - almost all ripe tomatoes eaten, all the way to top of 4' plant.


IMG_9195.JPG
~3" wide holes that seem to go very deep 

IMG_9196.JPG
Plant bases are "excavated"

On Thu, Sep 7, 2023 at 5:04 PM Susan Drake <<personal data hidden>> wrote:
Thank you so much for this reply! I feel less alone. :) I will consider lining my beds - it will be a huge undertaking because they are very large. But something I can chip away at over the fall. An interesting point, one of the raised beds is actually a bamboo planter that we repurposed to grow peppers. So it has a super-dooper plastic bamboo lining all around. So whatever is in there is climbing in from the top. 
 
Will also try your other suggestions re traps and repellents. 

Sure appreciate all you at the OSU extension service. Always quick, helpful replies over the years. 

Let me know if you hear anything from the Master Gardener and condolences on your school carrots. :( 

On Thu, Sep 7, 2023 at 3:35 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied September 13, 2024, 4:25 PM EDT
You make me chuckle because your tomatoes look like some of mine.  I think you are right that it is more than voles and mice.  I suspicion it might be ground squirrels that love tomatoes especially the ripe and sweet ones.  I have a lot of squirrels around my place.  I just hate to put up a fence around the raised but but might have to. 

We are also having the same problem in our school garden along with deer who decided to come the week before school started and helped themselves to all the beans, kale that was under protective cloth and ate the blossoms off the tomatoes and made a big mess.  

I checked with one of our volunteers at the school garden and he suggested a wildlife camera that you put out and it records what is eating your garden.  Also you might get one of the sensor sprinklers that turns on with movement and will scare them away. They work pretty good.  

I am also having trouble with something eating my corn and think it might be the crows or some bird since they are not tipping over the stalks just eating through the husk and enjoying the kernels.  

My wildlife friend is going to have some of his colleagues look at the pictures and the holes and if he gets back to me with ideas I will let you know.  

The way the critters are eating everything we might be in for a cold winter.   Hope not. 

Keep in tough and try one of those sprinklers and see if you can scare the above ground critters away.  Will let you know if I come up with some more ideas.  

Nellie
An Ask Extension Expert Replied September 13, 2024, 11:45 PM EDT
Oh my gosh, I feel so validated and supported! ;)

OK, my first step is going to be a wildlife cam. 

Stay tuned! 

On Fri, Sep 13, 2024 at 8:45 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied September 14, 2024, 3:01 PM EDT
On the off chance that you know this: Can you recommend a backyard cam? 

Just looked on Amazon and there are literally a million of them, and many for under $100.

Do you have personal experience with something you like?



On Sat, Sep 14, 2024 at 11:53 AM Susan Drake <<personal data hidden>> wrote:
Oh my gosh, I feel so validated and supported! ;)

OK, my first step is going to be a wildlife cam. 

Stay tuned! 

On Fri, Sep 13, 2024 at 8:45 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied September 14, 2024, 3:06 PM EDT
I am sorry I don't know much about wildlife cameras but have sent a message to my wildlife specialist friend who wants to put one up a the school and see what he advises and what the wildlife department uses.  As soon as I hear back I will let you know.  I will see him in person on Thursday so if I don't hear from him will ask him.  

Nellie  
An Ask Extension Expert Replied September 15, 2024, 3:31 PM EDT
Great responses, Nellie.. All the rodents, incl. all squirrels and chipmunks can wreck havoc in a garden. Hot weather draws them to our luscious plants like a magnet.
Patricia Patterson Replied September 16, 2024, 9:21 PM EDT
Thanks Pat.  If you have suggestions feel free to share.  You are an expert in critters.  Hope you are doing well.  Will catch up soon.  smile.  

An Ask Extension Expert Replied September 16, 2024, 11:06 PM EDT
Hi Susan,
I just heard back from my wildlife expert friend, and he got some recommendations from the wildlife department.  They use the expensive cameras which you probably don't need.  They also recommend that you look around for skat (poop) that would help identify what animal it is as well if you find any.  

I would think one of the less expensive cameras would work for your situation.  Below is the response from Dan if that helps.  Good luck

Nellie

We have a Professional Research Series Reconyx camera: https://www.reconyx.com/product/hyperfire-2-Professional-covert-ir-camera
Reconyx Scouting Series cameras are not quite as rugged as the research-grade cameras: https://www.reconyx.com/product/hyperfire-2-covert-ir-camera
We
use our camera just to know what is out there so have it set to take
photos and not video. The "near video quality" takes photos frequently
enough that we can catch interesting behaviors. It will take continuous
photos every second until the target moves out of camera view. It is
"no-glow" infrared so wildlife won't react to it at night (although
coyotes are so wary they usually stare at it and sometimes reverse
direction!).
Research grade
cameras are more durable, reliable, and have better power management
(batteries last longer). Ours will take 1,000-2,000 photos over 3-4
months before the 12 rechargeable NIMH batteries need to be replaced.
Reconyx
camers are expensive ($460) but will last for years. Ours has been
running continuously for eight years. We used to buy cheap Stealth
brand cameras every year or two after they stopped working.
Panthera's Olympic peninsula cougar project has
100s of cameras deployed and it looks like they use some Browning
cameras ($100-$250) and a few Covert brand cameras so those brands must
be good too.
One thing to consider when
deciding between the photo vs. video setting is the amount of time it
takes to watch 100's or 1000's of videos vs. quickly flipping through a
1000 photos in 5 minutes. Which you use may depend somewhat on how much
wildlife traffic you will have passing your camera.

An Ask Extension Expert Replied September 18, 2024, 4:36 PM EDT
Such great information, thank you!

Hey, we finally caught something in a trap. The trap was set in a raised bed growing hot peppers. There were multiple holes and excavated ground around plants. This is what we caught. Pretty sure it is a rat.
I am not assuming that all my problems are rats, but wondering if they could be the main culprit. 
4FA3D66A-6B97-4078-8A00-4362561A672C_1_105_c.jpeg

On Wed, Sep 18, 2024 at 1:36 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied September 20, 2024, 2:04 PM EDT
Congratulations on your catch.  It is a rat and they our very destructive.  My wildlife friends thought from the holes and runs you sent they were rats.  I would keep setting traps.  Could add a little peanut butter to attract them.  Good luck.  

Nellie
An Ask Extension Expert Replied September 20, 2024, 3:19 PM EDT

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