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If you have rose bushes, fungal diseases such as black spot and mildew can be prevented, but not cured. Spray a fungicide every 7 to 10 days as a preventative measure.
By Terri H.
I have also heard that tea tree oil works well for fungus on plants. I'm not sure about the quantities, but dilute maybe twenty drops per gallon of water, put in a spray bottle, shake well, and spray away. Doing the same with citronella oil also works for many plant pests. A combo of the two oils might be a good overall cure and even preventive measure (spraying once a week in warm months) for problem plants, both indoors and out. Diluted garlic oil is also a good bet for pests of various sorts, but can burn the leaves of plants. Crush several cloves and let them soak overnight in a cup of light vegetable oil (Olive is too heavy), then strain out the garlic bits with cheese cloth and mix the leftover oil with water.
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I have noticed black spot on some of my roses. What do you suggest?
Try 1 cup of cornmeal to 1 quart of water. Set for one hour and spray roses.
In rose care the best thing is a systemic feed that also has properties against black spot. After care, the best thing is a commercially produced and carefully applied fungicide labelled specifically for black spot.
Once you get rid of the black spot, be careful to avoid reintroducing conditions favourable to its development-don't water close to or after dark; keep the center of the plant open with proper pruning; space new bushes proper distances apart; and disinfect your pruning tools between cuts, not just plants.
Feed with one of the systemics to keep a beautiful and healthy plant.
What can be done about roses that have extreme black leaf?
By Paula H.
In the old days, they would tell you " throw your dirty dish water on it". Now a days very few people wash dishes by hand. So put a little dish soap in your watering can, suds it up and pour it over your rose bush. I would remove the bad leafs. I have alot of rose bushes and it works for me. Do not use eletric dishwashing detegent!
I was having problems growing roses, so I went to a class. the most important thing I learned was to make sure I never water the leaves. Since I started only hand watering the rose bushes from the bottom, they are doing great! I also keep lots of composted soil around them, covered with mulch and then I do not even need to fertilize them at all.
Where can I buy on line Captan for black spot on my rambler rose?
Please and thank you.
I have black spot on my ramble rose and all the leaves are slowly dropping. Is soapy water any good if I spray it with that or do I have to get Captan to clear it?