Here is the mantis (I think). He barely moved at all, I only noticed his abdomen - and then eventually, I saw the rest of him. He was on a honeysuckle (which hasn't bloomed this year).

Someone may come along with better advice, but if I had a sawfly problem and was unable to hand remove them I would probably start with insecticidal soap spray or spinosad. I try to do the least toxic interventions first. For longer term control you might look into beneficial nematodes for the soil. I am uncertain if they could help in this case but they and other predatory insects have worked miracles in my garden. I have used DMV Beneficials and they do free consultations. Arbico Organics and Nature's Good Guys are other options but I don't have direct experience with them.

Blast first with plain water from a hose. Or is it small enough to stand it in the shower? Plus hand picking if it's just one rose in a pot.

Timewise I found it easier to check the plant daily and either hose off larvae or flick them into a bowl of soapy water than dealing with the adult sawflies. The larvae can do a lot of damage in a short amount of time (days). 1-2 years was enough to break the cycle and eliminate sawflies from my plants.

Thanks, everyone!!

I saw the plant yesterday and I'm going to have intervene quickly - I think some other bugs have moved in. It has very few leaves left (though, they don't look chewed at least so I guess the sawflies have gone) and there were some very fine spider webs. I hope the mantis comes back.

I think I'll medivac it to where I can keep a daily eye on it. I'll do a repot with a thorough wash, and probably coat it in something. And then cross my fingers.

I guess I'll need to keep it away from other plants, too. Hmm. Maybe I'll leave it where it is on second thought, but do the treatments.

Good luck with your plant. What I do is check the undersides of the leaves, and if there is a larva, I fold the leaf over the bug and squish.

Go get a spray bottle of Captain Jack's Bug Brew.... spinosad. It should kill sawflies. You might have to spray daily. Certified for organic gardening.

-Babka

Hmmmm...black roots, I've never seen that with top having nice growth. I have no idea. I'm sorry you had to lose a rose (I've lost countless, lol); but as you said, you get to shop for a new rose!! That's the fun part.

Need, That sounds like an overwatered rose that the roots rotted, or roots that cooked to death in the heat.

Okay, that makes sense. Always learning.