Rose insect pest control

fgilles02420(z6 MA)July 4, 2006

This year has been the worst for my roses ever. Many (not all) have suffered from some sort of leaf pest that appears to eat away the green of the leaves, leaving them brown, lacy, skeletonized. (One problem is, I can't actually find any insects, larvae, etc after searching the plant).

After consulting a few rose people it seems the problem is either some kind of tiny inchworm/caterpillar or sawfly larvae. Maybe they've finished their life cycle for now so I'm not seeing them. In any case, I need to develop an organic rose program so I'm here for advice.

So far, my efforts at rose growing have been the same as the rest of my garden, which is mostly perennials: add a lot of compost at planting time, then nothing else. This has worked great for perennials but apparently I could be doing more for my roses.

Here's what has been suggested:

1) Spray early spring with Cornell formula (hort. oil/baking soda)

2) Spray periodically throughout season with neem to control whatever insect it is that's eating my plants

3) Fertilize monthly April - August with some kind of organic fertilizer (alfalfa tea/aged manure/fish emulsion)

4) Add 1/3 c epsom salts 3x season

5) Add a little wood ash to raise pH

6) Prune away dead, damaged wood early spring

Question, if indelicate: can urine be a source of one of the organic fertilizer treatments and if so should I dilute it and how much? Kind of seems like free nitrogen.

By the way I'm not growing sissy roses. Here's the list: William Baffin, Fairy, Bonica, Therese Bugnet, Champlain, Linda Campbell, Constance Spry, R. hugonis and glauca, Felicia, Nymphenburg, Winchester Cathedral.

Thanks for any opinions!

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Skip the urine on the roses, but if you still have to go, make a run out to the compose bins and go there. Then go get some insecticidal soap and spray your roses regularly, unless you have lady beetles. Other wise, the IS should solve your problem. Most of the other things you suggest will serve to bolster your roses own defenses, the neem will help to ward off bugs. The IS will kill the ones that eat the rose leaves. Cheryl

    Bookmark   July 27, 2006 at 12:25AM
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