How to Control Rose Sawfly

Here is a quick video from Matt on how to identify Rose Sawfly Larvae damage as well as how to control it. Sawfly larvae eat foliage, and the severity of their damage depends on the host, the size of the population and general health of the plant. High populations of sawfly can do a lot of damage
and will add some stress to the host’s life, but generally won’t kill the host. Repeated defoliation year after year can lead to decline.
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[@SS-jw9mm]

Hosing them away with water branch by branch is the best do it weekly.

[@raymondharris7226]

I appreciate you, Thanks for sharing this.

[@Tinyteacher1111]

I tried Neem on top and under the leaves, removed the affected leaves, but they are still being “bugged” by these worms…. Found one! I just feel sorry for the plant. I found this tiny thing in the back of a flower bed after I bought the house 4 years ago, and put in a pot. It’s better there right now. Can I leave it in the pot this summer and nourish it? I picked a place that is in full, hot morning sun, but I could put it elsewhere if that’s too harsh. I appreciate your response, if you do reply, because I’m not really a rose person, so if I can keep this alive (I don’t think it has any special qualities), but I may attempt another. 🌹 Thank you for reading this❣️

[@Khaymen223]

Yeah neem does not work against them. At least in concentrations of recommend strength.

[@carolmeakins3578]

Thank you. Good information

[@WascoNursery]

Glad it was helpful!

[@GardenDoodles]

Bonide systemic has been quite effective for us but we do use it sparingly. Luckily, our roses have not had major infestations the last few years.

[@Anyone4237]

Thank you for this info! Unfortunately my rose bush had a major sawfly infestation and 99% of the leaves have major damage. What can i do at this point?

[@WascoNursery]

The best thing to do is to care for the plant as best as you can, and cross your fingers that the plant can fight through it. It is important not to overwater plants when they are damaged. Plants that have less leaves due to damage require less water, than they previously did. Many gardeners fall into the trap of overwatering damaged plants, which ends up speeding up the death of the plant. As per the video, make sure to fertilize the bush to promote new growth. Spraying at this point can help prevent secondary insects from munching on the plant throughout the summer. Next year, it would be a good idea to proactively spray the leaves with either a systemic spray or long-lasting contact insecticide like "Hi-Yield Bug Blaster": www.wasconursery.com/product/bug-blaster/

[@Anyone4237]

​@@WascoNurseryThank you!

[@barbarablonsky7521]

Thank you!

[@WascoNursery]

You're welcome!

[@heywoodjablome2018]

I have two roses that are in pots they were my mom's. I would like to bring them in for the winter but have noticed they have these larvae. Do I have to worry about other house plants if I don't get them all off or miss one accidentally?

[@WascoNursery]

Hello, unfortunately roses will not survive the winter if brought indoors. Roses, like other perennials, require a dormant period in which the temps must get very cold. If they are brought indoors, they will not be able to have a dormant period, since the temps will remain hot. If you would like to avoid planting them in the ground, you can bring them into an unheated garage and water them once per month (or as needed).

[@WascoNursery]

Regarding the larvae, Rose Sawfly is host specific to roses, meaning it should not eat any other plants.

[@heywoodjablome2018]

@@WascoNursery didn't know that. I brought them in last winter guess I got lucky. Thanks will put in my outside shed. Appreciate the reply as well.

[@WascoNursery]

@@heywoodjablome2018 Roses are weird and can sometimes survive without a dormant season... That being said, I still strongly recommend putting them in a place like your shed (unheated, but protected from cold wind).

[@FinchKnitSewStudio]

I have a pumpkin plant, growing near one of my roses, and I see a whole bunch of little brown dots which I assume are eggs on the bottom of the pumpkin leaves. I feel like maybe it’s a terrible idea to have this pumpkin and the eggs, right next to the rose. Should I just cut leaves off the plant or take it out entirely?

[@WascoNursery]

If you are local, I recommend bringing in a sample of the pumpkin for us to look at. If you are not local, I recommend reaching out to a local, reputable garden center with a plant clinic or nearby university extension office. Just as a general tip, many insects are host specific to one type of plant. For example, Rose Sawfly, the insect mentioned in this video, does not harm other plants during its larval stage. That being said, there are other insects like aphids and mites (among others) that can spread between different plant genera.

[@erinjames377]

Systemic is my favorite

[@Tinyteacher1111]

My friend swears by that. My rose is in a pot right now, so I wouldn’t be contaminating my organic plants. I may try that. 🤔

[@MarisolGuaman-b2j]

What can I do my roses is losing all leaves?

[@WascoNursery]

Thanks for reaching out. Is it a newly planted one? If so, make sure not to over water it. Roses do not like to be over watered. They also do not like mulch touching their trunks, since it holds in extra moisture. Allow the plant to fully dry out between waterings. If the plant has been there for a long time, check to see if there are any fungal or insect issues, like the ones mentioned in our other Rose Care videos. Trimming out diseased branches, spraying and fertilizing are all things that you can do to help established roses.

[@brendasizemore1786]

Something is affecting my Ranier cherry tree leaves. I found a larva brown translucent small worm. I have a picture but I don't see how to send it. I thought it might be a hover fly larva...how do I know?

[@WascoNursery]

You can submit photos to our plant help hotline by texting: 630.584.4424

[@Moondancer_15]

What is the name of the systemic type?

[@WascoNursery]

Bonide's Systemic Insect Spray

[@aadhithyabalaji4926]

Is neem oil spray effective for this ...

[@WascoNursery]

Yes, but you will have to spray it every 2 weeks, while the insects are feeding. You will also need to make sure that you spray the undersides of the leaves, since they typically go to there. Neem oil is a great product, but it does not last as long as a systemic would, so it can be less effective if it isn't applied frequently and generously.

[@jerridyke68]

@@WascoNursery thank you for taking the time in being so specific in your answer. It is so appreciated!

[@Moondancer_15]

And what are the downsides to using a systemic type that only lasts 10 days? The whole point is to try to kill whatever is eating your rose so are you talking about bees that land on the flowers themselves? Would they be killed by the systemic spray? This is my first year having a rose so I need all the info I can get and my friend has these saw flies as far as she can tell. But they are also inside of the rose flowers themselves too. So is that a sawfly or something else?

[@WascoNursery]

Rose sawfly typically only eat the leaves themselves. She may be seeing Japanese Beetles, which are another insect we covered in a previous video. Re: systemic sprays, if pollinators visit a plant while systemic insecticides are inside the plant, they could die. That being said, most of the insecticides will only last a couple of weeks, so if you are concerned about pollinators, just make sure to do it before the blooms come or as they are starting.

[@w.loczykij5354]

Squashing little buggers. But i jave only one rose plant

[@MarisolGuaman-b2j]

My roses doesn’t have leaves little bit by little loss all leaves! What can I do?

[@WascoNursery]

I just responded to your other comment with some care methods. Feel free to stop in with photos too, if you are local to the St. Charles, IL area.