Note til mig selv om Neemolie

blandingsforholdet, som jeg brugte er 5 ml olie pr liter varmt vand, dertil en lille klat krystalsæbe, for danne en emulsion

og så har jeg fundet ud af at en alm blomsterforstøver ikke er verdens bedste, da den ikke fugter planten godt nok, ihvertfald ikke den jeg havde, så jeg fandt lige min gamle havesprøjte fra krybdyrstiden frem



http://www.chilifan.dk/da/forum/?forumID=2&topicID=1204

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The brand of neem oil might have a web site. Do you know the name?
I used neem oil last year. The only rose (out of about 40) that got black spot was one that didnt get the spray. My neighbor's roses all got lots of black spot. It killed the aphids as well.
I was very happy with the result. Even using the neem oil, there WERE lady bugs, spiders, and praying mantises, and the soil has lots of earthworms, so I think that the natural predators & soil life are still there. I also grow garlic, chives, shallots, cilantro, rosemary, thyme, in the rose bed as well, bot I doubt that those had significant impact on the black spot. I think it was the neem oil combined wiht rose hygeine (pruning and clean bark mulch).
Also, my rose varieties were not necessarily resistant varieties. Most had black spot problems the year before.
The brand that I used was called "100% pure neem oil" (strange brand name) distributed by Natural Greenhouse Products. There are many brands available, some are pre-mixed, some are purified. None are cheap, but then neither were the roses. This brand might be local to this area, I dont know. I used according to instructions.

 http://forums.gardenweb.com/discussions/2131658/neem-oil-spray

Neem oil is the best, but it has to be pure cold pressed to be effective. As far as foliage burn, you need to read the instructions and use it accordingly. If you live in a hot climate with lots of sun, only use in the evening. In regards to killing beneficial insects this is completely untrue, we have a healthy lady bug and bee population that are not bothered by it, if you use it mixed correctly.
I use Dyna-Gro Neem oil mixing it as instructed but instead of the mild soap it says to mix with it I use Dr. Bronners peppermint castile soap (same quantity). If you mix it use warm water and let the mixture sit overnight as neem oil is an oil and tends to not mix very well, especially if using cold water. Remix and enjoy natural cure

NB!!!! sidste blading måske best??
 . Now I use Cornell spray, which must be applied more often, but is far safer. I use
1 and 1/2 tsp. of baking soda
1 quart water
1 tsp. canola oil. This is 1/2 tsp. more baking soda, than the common recipe, and it does leave a powdery residue which works better in preventing the spread of p.m. and blackspot and rust. You can tell the white powder is not pm. because the leaf texture is not altered by the baking soda, unlike powdery mildew.

1liter vand
1½ tsk bagepulver
1 tsk raps olie