Cheap effective way to treat black spot on roses?
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there's an aerosol spray can in home depot, around $6
use the washing up water on them it clears it without sprays etc
Paint them........ ,Sorry i couldn't resist that one. lol xxx
Basic Cornell Spray: For Control Of Blackspot & Powdery Mildew: Do not substitute vegetable oil spray for the summer weight agricultural oil, it doesn't emulsify in suspension when water is added. SunSpray contains a sticker so no soap is necessary, with other oils you may need a few drops of dishwashing liquid. Another tip I have learned is to spray this in the evening, around or just after supper time. Do not spray this in the hottest part of the day.
2tbs Horticultural Oil (Sunspray or Volk Oil)
1tbs of baking soda
Add to 1 gallon of water and spray leaf surfaces LIGHTLY, not to dripping. Reapply every two weeks.
This will help to control powdery mildew and blackspot as well as other fungal diseases on roses.
Milk diluted 1:7 and sprayed weekly. This can help prevent spread of the disease but places the spots are established will continue to grow until the leaf is lost. Spray stems as well as leaves. Dried milk works well.
Cornmeal
Dust the ground around roses with cornmeal, and water in. This helps to eliminate black spot spores that attack roses, and also helps to eliminate the spores in the soil around roses.
Whole Neem oil apply per label directions. This one is much more effective used before the disease appears than when trying to control the disease after it appears.
Fenarimol (Rubigan, Bloc, EL-222) — A chlorophenyl topical fungicide which acts primarily as a foliar and stem protectant against fungal germination. Oral lethal toxicity (LD50) in laboratory rats is 2500 mg/kg, or about half as toxic as aspirin. Long term studies still pending.
First of all, the washing up water will not clear it, it will of course get rid of green fly from your roses. Roses should be sprayed at the first sign of black spot with a fungicide "orthocide" and repeated again when necessary.
yep mild warm soapy water sprayed over the plants bugs hate it
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