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Home / Archives / Homemade Asparagus Beetle Insecticide Spray

Homemade Asparagus Beetle Insecticide Spray

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Spotted asparagus beetle on the asparagus sprout top. The main pest of asparagus crop.

O-M-G! For the past 5+years we’ve been growing Asparagus and I’ve been exclaiming how very easy it is to grow… But this year I’ve been proven wrong 🙁 We have a horrible infestation of Asparagus Beetles, the kind with the red spots on their backs.. they eat away at your baby asparagus, opening the tight flower heads, leaving trails cut into the stalks and planting little egg things all over the plants.

We have 2 raised asparagus beds (1) 4ft by 8 ft and (2) 4ft by 8ft which gives us a total of 96 sq/ft of asparagus. The thing about growing Asparagus is it slowly increases in quantity year by year. You can’t even pick any asparagus until year 2 after you planted the crowns! Then year 3 you pick all the asparagus for a week or two then let the ferns grow (they need the top plant to feed the roots lovely vitamin D sunshine! – bigger root system, more asparagus) Year 4, you pick 3-4 weeks, Year 5 you pick 5-6 weeks, etc.. you got the concept right? Each year the roots have grown/expanded and are sending up more shoots. We’ve been enjoying asparagus from our first (smaller) bed for about 4 years now.. the larger bed we started a couple years later so which we just really started harvesting last year… SO It’s a complete bummer when I go out every evening (yes you have to pick asparagus every day or else it flowers and is yucky) that all my beautiful asparagus is chewed up and covered with bugs.. the darn bugs are even eating the tiny ferns that are from very new/young roots… remember if the plant can’t send out it’s solar panels to collect the sunshine it can’t keep growing roots, the plant will die…

I started researching how to kill these Asparagus Beetles, between my gardening books and the internet, the solution is simple, Insecticidal Soap! Great, I thought, I can do that! Look out bugs here I come! Insecticidal Soap is just soap in water… it’s not scientific, it’s not precise.. or so I thought! I grabbed one of my spray bottles, filled it 3/4 of the way with water then added about 1T Seventh Generation Dishwashing Soap gave it a little shake and out the door I went to kill some bugs!

Asparagus Beetles 1, Hayley 0….. I failed. None died, So back to research.. ok so I added more soap 2T and 1T olive oil – oil is supposed to help coat the bug/plant to make it stick better.. Asparagus Beetles 2, Hayley 0.. Failed again… Back to research again… someone swore by Dr Bronners Peppermint soap in their insecticidal soap – Great! I have it.. I started over water, peppermint castile soap and olive oil.. Asparagus Beetles 3, Hayley 0.. this sucks.

Ok, everyone searching for an Organic/Natural solution comes to a point where the question the hassle of the direction they are going.. is this worth it? what is the cost to loosing all this Asparagus? Sometimes I almost wish I didn’t know how bad things like Roundup, Sevin Dust, etc are us and are planet…. times were simple 10 years ago I sprayed weeds with round up and dusted everything with sevin dust, gardening had little frustrations… but I can’t forget what I know and there has to be a solution!! And with complete honestly, I can’t imagine spraying a chemical on my asparagus to kill some bugs with all my chickens standing right next to me.. in the overspray.. looking for bugs and worms all around the asparagus.. breathing and eating such horrible things.. because we eat their eggs and we eat their meat.. I don’t want to eat contaminated meat and eggs or feed them to my friends and family!

Yet again, I set out looking for more ideas to kill these bugs and save my asparagus.. I saw references to cayenne peppers, essential oils, garlic, etc added to insecticidal soap. I decided that I might have to really make up a formula that’s a little more complex that soap in water.. and that’s ok. I’ve come to accept that if it takes some time this year to figure out a fool-proof solution, it will provide me with years of beetle free asparagus…. and I’ve got to admit it’s kinda fun to be a mad-scientist running tests to find a cure! I mixed up a recipe that I thought was covering every option I’ve read about, filled my sprayer and even took some paper plates to collect beetles on and watch them (hopefully) die.  It was a success! I found a solution!!!!!

Asparagus Beetle-Killing Insecticidal Soap

If you’re growing asparagus in your home garden, the asparagus beetle is a pest you will be all too familiar. This annoying insect is about half a centimeter long and is a metallic bluish-black color with white or yellow spots on its back. Its back also has a red border. The larvae are fat, grayish-green grubs with black heads. The eggs of the asparagus beetle are small, brown ovals and will usually be present in abundance.
5 from 1 vote
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Ingredients

  • 3 cups water
  • 1 teaspoon crushed red pepper
  • 2 cloves galic
  • 3 tablespoons Dr Bronner's Peppermint Castile Soap
  • 1 tablespoon Cold Pressed Orange Oil Concentrate

Instructions

  • Bring the water to a boil, remove pot from burner. Add in the crushed red pepper, garlic-no need to peel, just coarsely slice, soap and olive oil.
    Let everything marinate until the liquid is cool then fill up your sprayer (don't drain the peppers/garlic out, leave it in)
    This should be enough to fill a standard spray bottle (roughly 24-30 ounces)

Notes

Warning, do not put everything in a pot and bring to a boil, it will get foamy and boil over, making a big mess on your stove!
Tried this recipe?Mention @HealthStartsinthekitchen or tag #HealthStartsInTheKitchen!

May 9, 2012 · 22 Comments

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Comments

  1. AvatarCarolyn says

    July 14, 2020 at 4:15 pm

    How much olive oil in your asparagus beetle/insecticide spray? I don’t see it listed in the recipe. Thank you!

    Reply
    • AvatarHayley Ryczek says

      July 15, 2020 at 7:24 am

      I mention olive oil as something I tried in my tests, but it is NOT used in my current recipe.

      Reply
  2. AvatarCynthia Campbell says

    June 3, 2020 at 6:06 pm

    I bought some nematodes, and they should take care of the larvae but I was thinking to use this spray on the adult bugs. Do you know if it would harm the nematodes?

    Reply
  3. AvatarJulie says

    May 22, 2020 at 12:55 pm

    so this is safe to spray right on the asparagus spears while they’re growing (and, following a rinse, not dangerous for us to eat afterwards)?

    Reply
    • AvatarHayley Ryczek says

      May 26, 2020 at 6:44 am

      Yep!

      Reply
  4. AvatarEric says

    July 1, 2019 at 9:02 am

    Pretty close to my general insecticide spray. Here is mine – 1T Cayenne pepper, 1/4 C. mouthwash, 1/4 C. Castile Soap, 4-5 cloves garlic, 2T vegetable oil, 1/4 C. baking soda, 5-6 drops of peppermint oil.

    I put the garlic, pepper, mouthwash, and baking soda in 1/2 gallon mason jar of water and let steep in the sun for a couple days – sort of like what you are doing with your boiling process. I then add the rest into my 1 gallon sprayer and strain the concentrated brew into it. Fill with the other 1/2 gallon of water and spray away. I use this on all my veggies as a general insecticide and (with the baking soda) fungicide. I suspect it is the pepper that is taking out the asparagus beetles. The garlic tends to ward off adults from landing there to lay eggs – I am trying it on zucchini this year to see if I can keep away the squash borers and squash bugs which take out my crop every year about this time. So far, so good. It is somewhat effective on cabbage and other related veggies but those cabbage moths are very persistent. THis paper says garlic spray as effective as malathion on cabbage moths though…

    https://www.researchgate.net/publication/272996610_Use_of_garlic_Allium_sativum_as_a_repellent_crop_to_control_diamondback_moth_Plutella_xylostella_in_cabbages_Brassica_oleraceae_var_capitata

    BTW, its important to spray after each major rain event for the preventative effect – unfortunately… as I said those cabbage moths are persistent.

    Added benefit – I found it is very effective at keeping deer and bunnies away – makes sense would work on groundhogs as all rely on sense of smell for protection and do not like to browse where it could be masked…

    I just captured some wild asparagus and the ferns have beetle larva so they will get sprayed tonight and good riddance!

    Reply
  5. AvatarRICK says

    May 27, 2019 at 8:11 pm

    Wow Thanks so much. This really works and the soap seems popular so I wonder if others are using it too.

    Reply
  6. AvatarGary says

    August 2, 2018 at 10:53 pm

    Haley, wonder if you might write your asparagus recipe without abreviations and also let me know how much water to use and how long to boil. Thank you!

    Reply
    • AvatarHayley Ryczek says

      August 3, 2018 at 7:27 am

      Small t is teaspoon
      Big T is tablespoon
      They are standard abbreviations

      You bring your water to a boil, that’s it. You don’t coontune boiling it. Turn off the heat.

      Reply
  7. AvatarMatt says

    May 16, 2018 at 1:01 pm

    I’m obviously late to the party, but never had these pests until this year. Gave up on hand picking them off – too many of them. Found your post and after finding the Peppermint soap at Walgreens I whipped up a batch. Just came in from the garden after applying (in a light drizzle rain, no less) and this concoction worked like a champ. Almost instantaneously! Die bugs, Die!
    Thank You!

    Reply
  8. AvatarTeija says

    May 12, 2018 at 9:48 pm

    Thank you Haley! I’m going to mix this up pronto! I’ve been obsessing over a way to get these evil creatures off my asparagus . I ordered some ladybugs but I think I will release them on the bean beetles that are weirdly al over everything this year.

    Reply
  9. AvatarJen says

    May 10, 2018 at 2:15 pm

    I feel kind of gross asking this question, but I just picked some asparagus that had eggs on it ? I handpicked them all off and washed the asparagus really well. Can we still eat it or should I get rid of what I picked? I’m a total newbie to gardening so if this is a really silly question, my apologies! We were blessed to buy a house that had a huge asparagus bed already established! Thanks in advance!

    Reply
    • AvatarHayley Ryczek says

      May 11, 2018 at 8:36 am

      Yes, just wash well.

      Reply
  10. AvatarJessica says

    May 6, 2018 at 4:03 pm

    How long does this keep?

    Reply
  11. AvatarSusan says

    July 26, 2016 at 9:43 am

    Hayley can I use this for potato beetles as well? I found your site this summer and it worked great on asparagus beetles. Never had anything that worked this good. I used it on worms that got on my nut trees as well. Am mixing it up for the potatoes but was wondering if you had a better idea. You have saved the day. Thank you, Susan

    Reply
    • AvatarHayley Ryczek says

      July 27, 2016 at 7:23 am

      It won’t hurt to try it on potato beetles, it’s a general insecticide so it will work on many things in addition to asparagus beetles 🙂

      Reply
  12. AvatarMona says

    May 15, 2016 at 5:05 pm

    Thanks, I am going to make this up right now.

    Reply
  13. AvatarColleen Lockard says

    May 13, 2016 at 2:53 pm

    Haley, thanks for sharing your recipe. I am mixing up my first batch right now. I hope you can answer a couple questions for me. Do I spray every day? Is the asparagus safe to eat, or are we sacrificing this year’s crop for future success?

    Thanks again!

    Reply
    • AvatarHayley Ryczek says

      May 13, 2016 at 8:02 pm

      No need to sacrifice, just rinse before cooking… Spray daily as long as there’s bugs 😉

      Reply
      • AvatarColleen Lockard says

        May 15, 2016 at 9:50 pm

        Thanks for the quick reply, Hayley. I’m ready to try this, but we’re having unusually cold weather and the beetles have not been active. BUT… this stuff works great on ants!

        A cactus flower fell to the floor in my sun room and I found a large group of ants feasting on it. This killed them on contact. I have high hopes for winning the war against the beetle.

        Just be sure to wash away all residue – apparently one of my cats walked through and thought his foot was on fire. 🙁

        Reply
  14. AvatarLaura Summers says

    June 14, 2015 at 6:10 pm

    Thank you so much! I’ve had asparagus for over 14 years and just last year the beetles found it. I have both kinds of the little buggers. Your ‘recipe’ does the trick, especially on the gross larvae! Thanks again, this is saving my plants 🙂

    Reply
  15. AvatarJess @ Crunchy Hot Mama says

    January 11, 2013 at 10:51 pm

    You sound like me battling those pesky cucumber beetles on my tomatoes and eggplant! I was out there everyday determined to keep them off my yield-little stinkers. I was pretty successful, but I know next year to be armed and ready for them (neem oil)!

    Reply

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