The dreaded red lily beetle

When I first started my garden, in the early 2000’s, I grew gorgeous oriental lilies that looked a lot like these:


But these are not my lilies. I photographed these on a garden tour in Buffalo, New York last year.

No, my oriental lilies were all killed by the wretched Red Lily Beetle (Lilioceris lilii).


Red lily beetles, sometimes called Scarlet lily beetles, crossed my radar several years ago. First I heard about them as a rumour, seemingly exaggerated, of beetles that could actually kill off all the lilies in your garden!? Then there was the odd siting. And then, the infestation.


Holes in lily leaves, wrecking their appearance, and then, as the infestation worsened, the plants lost strength. A patch of 5 robust lilies came back the next year as 5 scrawny lilies, 3 the next, and perhaps one valiantly fighting, but ultimately defeated, plant the year after that.


A few beetles wouldn’t have been enough to do in a lily–they’re pretty sturdy plants–but the sheer quantity of lily beetles attacking them was too much.


And the reason there’s so many of them? To start with, they have no natural predators in North America to control them. Secondly, they are very prolific at reproducing. Often as not, when I find them in my garden they’re in the very act:


Add to that their gross but very effective method of protecting their eggs from any would-be predators: they cover them in thick black excrement.


Disgusting and destructive on so many levels.


Fighting Back

The only really effective and legal way I’ve found to control them is to squish them by hand. But be warned, you have to grab them from below, otherwise they drop to the ground on their backs, and you can’t see them in the soil. I will confess that at the beginning of the gardening season I always put on a pair of gloves to kill them but, after a couple months, I’m so annoyed and desensitized that I just squish them bare-handed.


Gardeners were spraying their plants with Neem oil (which is derived from a tree that grows in India) in previous years and reporting some success, but the product was not officially registered with Health Canada (and therefore had not been tested for toxicity to humans, etc. etc.) so it was ordered off the shelves of garden centres in Canada a few years ago.


Other gardeners recommend dousing the soil around lilies with a mix of ammonia and water in order to kill the beetles that are overwintering in the soil. I haven’t tried this but the principle makes sense.


Some Lilies Remain

I’ve found that some lilies are more resistant to the beetles than others. To start with, daylilies are not affected by the beetles at all (this likely goes back to the fact that they’re not in the same plant family as true lilies, but that’s a gardener’s latin lesson I’ll save for another post). All of my oriental lilies died off from lily beetle attacks but I have one patch of Conca D’Or Oriental x Trumpet Lily remaining.

These are giant lilies (some sellers refer to them as “lily trees”) and, with diligent continuous monitoring and squishing, they have survived. I don’t think they’re as robust as they were before the lily beetles came along, but they still grow to 5+ feet, have lots of flowers and scent the neighbourhood wonderfully every evening during bloom time.


But I have to be diligent. The first red lily beetles appear in very early spring, even before the lilies emerge from the ground; I killed my first one on April 2nd this year. I encourage myself by remembering that for every one I squish I prevent multitudes of offspring–one online source I found says that every female lily beetle can lay up to 450 eggs!


Besides lilies, their second favourite food is Fritillaria:


Again, with diligent monitoring and management I’ve been able to maintain a patch of Fritillaria meleagris for at least a decade. Some years they look better than others, but they have survived.

So, if you are in an area that doesn’t have red lily beetles yet (hello Buffalo, NY–I’m jealous) enjoy your lilies but be vigilant to monitor for this pest. And if you are in an area with red lily beetles (hello most everyone else I talk to), well, keep on squishing.











  1. Sharona on February 7, 2018 at 9:03 am

    Look for Neem oil in Indian grocery stores. I found it there and it was cheap too.
    Here in Niagara Falls they are infesting so Buffalo is not far away.

  2. Re Farley on July 16, 2019 at 10:59 am

    My lily patch is under attack in Buffalo, NY. I only have a few of the giant lilies left but they are half as tall as normal. I will miss the aroma as I walk in my yard but at 73 I am looking for garden plants that do not require much care. The lilies did not require care. Just plant, stake and enjoy. So sad!!

    • Jennifer on July 17, 2019 at 7:06 am

      I’m very sorry to hear that the beetles have hit Buffalo, and that you are losing your lilies. Gardening does have its heartbreaks.

  3. Pam Burkett on August 30, 2021 at 7:45 am

    I’m in the Detroit area. The nasty red lily beetles ate my asiatic lilies to the ground right through neem oil and everything else I tried. My husband suggested I try diatomaceous earth. I put it on the ground in fall and then in the spring at first sign of lilies emerging. Beetles came, I kept applying and it killed them! I had an occasional outbreak on plants I failed to keep dusted but it works. This year I had lilies blooming around the yard. Read the package and be sure to use face mask so you don’t breathe it!

    • Jennifer on September 2, 2021 at 6:39 pm

      Thanks for sharing Pam. I’ve heard anecdotal reports here and there of people using diatomaceous earth for the red lily beetles but not yet seen any studies. I may have to get some new lilies (I have just two sad looking stalks left. They’re so depleted from the beetles year after year that they didn’t even try to flower this year) and give this a try.

  4. Susan Prieur on April 11, 2023 at 5:39 pm

    Hi. I’m in Windsor and I saw my first red lily beetles last summer. (2022). I monitor my plants three, four times a day and spray the lilies with insecticidal soap. The soap does work. Today is April 12, 2023 and I have just used the ammonia and water method on the soil where the lilies are starting to emerge. I hope this will help!!

  5. Deesqward on June 27, 2023 at 11:24 pm

    Hi, I’m in Brighton, Michigan. Never had a lily beetle in the garden until this year. I have about 20 oriental Lilly plants spread around my yard. All were infected. Also a couple of Asiatics I cut every one of them down and threw them away. Not sure what next hear will bring but I may not be growing lilies if this continues. I’ll try the diatamaceous earth. Definitely worth a try

    • Twobuchs on April 28, 2024 at 3:06 pm

      I’m also in Brighton, Michigan! Small world! Same thing happened here, same time! Tried diatomaceous earth last year, and it didn’t work. I’m fighting back this year! Trying Sevin!

  6. M. Salloum on April 28, 2024 at 7:27 pm

    Hate to say it. But you have to get into the habit of continuous monitoring and squashing multiple times daily.

  7. C Wild on May 22, 2024 at 6:50 pm

    Sevin is highly toxic to all insects, including those that pollnate your flowers. Best is to go out and kill adults by holding container of soapy water underneath and knocking them in. In the larval stage, Pick off and drop into the water. Takes some time but the most effective.

  8. Josie Frid on May 23, 2024 at 12:19 pm

    I sprayed my then I put sunflower oil on the plant keeps the eggs from sticking to the plant so far have no more

  9. Carole on May 24, 2024 at 1:47 pm

    This 2020 paper describes a successful trial using dry granite dust for asiatic lilies:
    If you use this, be very careful with handling–it’s not good for you to breath this material!

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