Can somebody diagnose this rose?

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julie777
Posts: 81
Joined: Wed Jan 15, 2020 4:04 pm

Can somebody diagnose this rose?

Post: # 73288Post julie777
Mon Sep 13, 2021 12:49 pm

AFA2C8AD-27E0-4C1A-A918-1EC53E60B06A.jpeg
Can somebody diagnose what is ailing this rose? Is it an insect that is eating it? Is that why the leaves are brown?
Zone 9.

Margit Schowalter
Posts: 145
Joined: Wed Dec 31, 1969 7:00 pm
Location: Alberta, Canada

Re: Can somebody diagnose this rose?

Post: # 73289Post Margit Schowalter
Mon Sep 13, 2021 1:09 pm

Hi Julie
Your rose is being eaten by rose sawfly larvae. We have had a lot of problems with it in Alberta, Canada this year.

https://www.missouribotanicalgarden.org ... flies.aspx

roseseek
Posts: 5279
Joined: Sun Dec 11, 2011 6:54 pm
Location: Zone 9b Central California, Sunset Zone 15

Re: Can somebody diagnose this rose?

Post: # 73290Post roseseek
Mon Sep 13, 2021 1:54 pm

Agreed, sawfly larvae. I'm not surprised you're having a greater problem with it this year. They LOVE "green house conditions" so warm, moist like in a greenhouse suits them just fine. From the dead leaves, I think I'd check for spider mites, also.
Kim
California Central Coast
USDA Zone 9b
Sunset Zone 15
Cooler inland coastal valley with strong marine influence

julie777
Posts: 81
Joined: Wed Jan 15, 2020 4:04 pm

Re: Can somebody diagnose this rose?

Post: # 73292Post julie777
Tue Sep 14, 2021 9:16 am

Thanks. Sawfly larvae, with maybe spider mites too. I was looking online for organic (not harmful to bees, other pollinators, people, pets or wildlife) ways of treating and preventing sawfly. I like the idea of using green lacewing larvae, but not sure if they would work and temperatures could be getting too cold for them in September, I think they need night time temperatures that don't drop below 15 degrees Celsius (59 degrees Fahrenheit).
Zone 9.

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