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Jun 2, 2018 2:43 PM CST
Thread OP
Minnesota, zone 4
Every year my climbing roses leaves develop tiny holes that make the leaves almost lacy, then turn yellow and fall off. With no foliage there are no blooms! I'm thinking it has to be some type of mite, and yet I see noe webs. I've tried just about every product there is, nothing works. What causes this and how can I stop it? I live in Minnesota. Also, what are these worms and how do I get rid of them?(no this is not the cause of the lacy leaves, it's just an additional problem to my roses because my other climber gets the lacy leaves w/o the worms) one climber is a Henery Kelsey
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Jun 2, 2018 3:11 PM CST
Name: Celia
West Valley City, Utah (Zone 7a)
I was one of the first 300 contributors to the plant database! Garden Photography Irises Plant Identifier Hummingbirder Birds
Celebrating Gardening: 2015 Cat Lover Butterflies Enjoys or suffers cold winters
I don't know what the cats are but you have leaf miners, I think. They get inside the leaf and leave little trails.
Jun 5, 2018 6:41 PM CST
Name: Frank Mosher
Nova Scotia, Canada (Zone 6a)
Birds Region: Canadian Clematis Lilies Peonies Lover of wildlife (Raccoon badge)
Roses Million Pollinator Garden Challenge Photo Contest Winner: 2017
LP52: You have or had rose slug, which starts with the "sawfly" depositing eggs on your rose bushes. They develop into initially small white worms, and as they ingest more and more of the rose petals, the chlorophyll makes their bodies greener. If you only have a couple of rose bushes, you can pick them off by hand at first sight, almost always on the underside of the rose leaves. Note: they do not stay there for very long, just long enough to defoliate your roses, thus you "have or had" rose slugs.
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Regardless of what anyone may say to the contrary, a spray containing the natural bacterium BTk or BTi (not going to look up the spelling but is something like: Bacillus Thorengensis .... something and is available even now from "Safer" in a small spray bottle version-just new on the market, and as a small concentrated bottle of BTK from various sources, that one can dilute and add to their spray versions, adding sulpher (to prevent powdery mildew) and neem oil to prevent a number of chewing insects if desired, however, can't spray neem oil on buds, and can't spray anything unless early in the morning or late evening. Did not quite understand your reference to the Canadian "Explorer Rose" that you mentioned, in that it may be less susceptible to this slug/caterpiller/grub, and there are a lot of roses which are virtually immune to the sawefl slug. Most "wild" roses are, including the Canadian-bred one you mentioned. I spray at first sign of this slug, with a diluted solution of Btk/Bti which acts by literally eating the stomach wall out of the grub, the carcasses are to be found still on the leaves, the next day. Not really as much trouble as it sounds, just part of growing fancy roses. PS. BTk and BTi are harmless to anything and everything including bees, fish, humans and on and on! It will quash mosquitos as well in their breeding grounds. Don't give up roses!! Cheers!
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