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What pest is this?
On Mon, 07 Apr 2003, Cass wrote:
In article , Mike wrote: On Mon, 07 Apr 2003, Cass wrote: The stem sawfly damage looks a little different on Baldo's site: http://members.tripod.com/buggyrose/...ephid-dam2.jpg That's it! The stem sawfly damage looks just like the marks on my roses, except mine are in a circle around the stem, as opposed to the spiral you show in that pic. The mark is unmistakable, though. That is definitely the guilty party. Rats! I'll ask you, too - is there something I can do to get rid of these guys that won't hurt the fauna I'm fond of? I've got good news and bad news. The good news is that you're not going to hurt the fauna you're fond of. That's because of the bad news: there's no IPM for stem sawflies, i.e. no way to treat stem sawflies other than pruning, *unless* you're comfortable using a systemic insecticide. There are reasons not to do that, mostly having to do with spider mites. Rose stem sawflies get some buds every year, but not many of them. Spider mites are considered the much greater risk to roses, and the use of systemic insecticides is thought to suppress spider mite predators. I'm guessing that's because most systemic insecticides have both systemic and contact action, but I don't know for sure as I never use them. Do a search: IPM stem sawfly http://www.extension.umn.edu/distrib...ponents/6953_0 0.html http://www.sactorose.org/ipm/84roseipm.htm Apparently a systemic insecticide will work: http://cecalaveras.ucdavis.edu/rose.htm http://www.rosecare.com/pests.html I think the rose stem sawflies won't continue laying eggs for long. Do a little study and see if you can live with it; otherwise, it's chemwick for you. Weeeell, that is good news/bad news. I'll do a little research and see if they have natural enemies or if you can see the eggs and pick them off, etc. I wonder why I've never seen the damage before? Maybe they get so few buds I just never noticed. Hopefully. g It sounds like using an isecticide is a cure worse than the disease, though. Interesting - I have Botanica's Roses, Ortho's All About Roses, Field Roebuck's Foolproof Guide To Growing Roses and Roses For Dummies - and none of them mention the rose stem sawfly. The closest reference is in Botanica to "leaf rolling sawfly." Definitely not the same pest. I wonder why none of these books mention this pest? That seems odd. Last Christmas everyone decided rose books were the perfect gift. They weren't wrong, either. Mike z8TX |
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