Roses forum: Fixing Sawfly Devastation

Views: 353, Replies: 12 » Jump to the end
Name: Rosemary
Sacramento, CA (Zone 9b)
Image
reh0622
Apr 14, 2020 2:30 PM CST
Shocked to see what these little worms are doing and I am squishing them wherever I find them. Should I be spraying them with something?
Thumb of 2020-04-14/reh0622/b69da4
Thumb of 2020-04-14/reh0622/800b79

Coastal Southern California (Zone 13a)
Image
jerijen
Apr 14, 2020 3:50 PM CST
Are you sure that's what it is? I mean, I've NEVER seen them do that.
Name: Lyn
Weaverville, California (Zone 8a)
Garden Ideas: Level 1 Garden Sages Celebrating Gardening: 2015
Image
RoseBlush1
Apr 14, 2020 6:38 PM CST
I, too don't think you have a problem with sawfly worms ... or whatever they are called ... They usually attack the foliage.
I'd rather weed than dust ... the weeds stay gone longer.
Name: Rosemary
Sacramento, CA (Zone 9b)
Image
reh0622
Apr 14, 2020 9:08 PM CST
They moved from the leaves to the buds in some cases. They sure look identical. They are also being attacked by aphids and whiteflies. I sprayed them off with water and made sure all the larva and webs were removed.
Tuscany, Italy
bart2018
Apr 15, 2020 3:07 AM CST
Agree with Jeri and Roseblush-the bugs I know of as "sawflies"eat leaves, and appear later on in the season.
Name: Rosemary
Sacramento, CA (Zone 9b)
Image
reh0622
Apr 15, 2020 8:39 AM CST
If not sawfly larva (and the worms were identical to the ones that were in leaves that were stuck together which also had webs in them) then what, and what do you think is the best control (including best for the environment)? Thank You!

A P.S.--Does anyone here recommend Monterey Rose & Flower Spray Plus (for organic gardening) to control rose pests and diseases sprayed on a 7-day apart basis thoughout the rose gardening season?
[Last edited by reh0622 - Apr 15, 2020 9:40 AM (+)]
Give a thumbs up | Quote | Post #2206639 (6)
Name: Lyn
Weaverville, California (Zone 8a)
Garden Ideas: Level 1 Garden Sages Celebrating Gardening: 2015
Image
RoseBlush1
Apr 15, 2020 10:59 AM CST
Rosemary ....

I have several photos of sawfly damage, but don't have time to look for them this morning ... Sighing!

This is a photo of 'Lynnie' with sawfly damage on the foliage. You can see a green sawfly slug on a leaf on the lower right hand side of the photo under the bloom.

If you don't see foliage damage as it appears in the photo, you do not have a sawfly problem.

Thumb of 2020-04-15/RoseBlush1/1f96e4

I hope this helps.

I'd rather weed than dust ... the weeds stay gone longer.
Name: Mike
Long Beach, Ca.
Charter ATP Member I was one of the first 300 contributors to the plant database! Roses Region: California Hummingbirder Farmer
Daylilies Cat Lover Bulbs Butterflies Birds Garden Ideas: Level 1
Calsurf73
Apr 15, 2020 11:12 AM CST
Try using this product. It's organic and harmless to pets and humans and targets larvae and caterpillars and won't harm beneficial insects.
It's made by Monterey (the same co. that produces the Rose and Flower Spray Plus) you asked about.
Bacillus thuringiensis (aka "BT") is the active ingredient and might be better than the other product mentioned earlier.

https://www.ebay.com/itm/29248...

[Last edited by Calsurf73 - Apr 15, 2020 11:13 AM (+)]
Give a thumbs up | Quote | Post #2206812 (8)
Name: Rosemary
Sacramento, CA (Zone 9b)
Image
reh0622
Apr 15, 2020 2:05 PM CST
Thank you, everyone. I guess there can be several flying insects/moths that lay eggs like that and then the larva voraciously can take over. I wonder if they only attack weak plants. This particular one, Angel Face, had to be pruned severely last summer because of canker.
Name: Rosemary
Sacramento, CA (Zone 9b)
Image
reh0622
Apr 15, 2020 3:07 PM CST
I just read in my Miracle Grow rose book, that leaf rollers can attack buds. Their damage to leaves, holes and skeletonizing them, also sounds like what I've seen on some of the bushes, so now I'm leaning towards the identification being leaf rollers.
Name: Arturo Tarak
Bariloche, Rio Negro, Argentin (Zone 8a)
Roses Dahlias Irises Plant Lover: Loves 'em all!
hampartsum
Apr 15, 2020 3:17 PM CST
Rosemary, the first photo shows the typical web that leaf rollers create. They are larvae of moths and thus very suscetible to BT ( Bacillus thuringiensis) . BT is harmless to people, pets and environment. It is specific to larvae of Lepidoptera ( order of Moths and Butterflies). If you can get BT, I would try to get rid of them asap!
Arturo
SW Ohio River Valley (Zone 6b)
Image
vaporvac
Apr 16, 2020 12:32 AM CST
just as a note, I seem to recall that BT is not useful for the true rose slug AKA sawfly larvae as it is not a caterpillar.
Zone 9, Sunset Zone 9 (Zone 9b)
Roses
Image
Mustbnuts
Apr 16, 2020 6:07 AM CST
True Arturo and true Vap. Go with their recommendations. That black ball stuff is worm or caterpillar poop. Go with the BT.

« Garden.org Homepage
« Back to the top
« Forums List
« Roses forum
Only the members of the Members group may reply to this thread.

Member Login:

[ Join now ]

Today's site banner is by arctangent and is called "Say 'Yes' to Yarrow"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.