I have knockout roses & they seem to have a fungi. can anyone tell me if I can can treat them & save them or will need to distroy them?:
Bayer 2 in 1 works systemically, through the roots, and is a fertilizer with an insecticide. Bayer 3 in 1 has the fungicide too. I think you have to keep using it for it to work correctly and eradicate the fungus. To help keep new fungus from spreading before the Bayer kicks in, a couple things can be used on the leaves that are organic and won't hurt even with the Bayer. If you have powdery Mildew, spray the leaves with milk, it really does work! Do it once or twice a week If it has Rust, a spray of Baking Soda and water-1 1/2 teaspoons per quart of water- also once a week, can prevent it from getting out of control. Leaf Spot or Black Spot are able to be kept controllable with 1/4 teaspoon of white or cider vinegar in a quart of water. Once a week. Spray when the temperatures are below 85 and in the morning or evening not in the middle of the day when it is hottest. Do not spray all of these at once either! Maybe a day or so apart if you have all three diseases. Then there are products from organic companies that also really work, Planet Natural; Gardens Alive; and there is something called Actinovate is a new organic fungicide I have found online, and at one of my local Garden Centers, which works too. Don't use other products that are chemical fungicides, until you wait for the time limit on what the label on the Bayer recommends. Only use the organic ones listed above. I take care of a few hundred roses in several gardens a week, using only these organic measures, but I also use other plant health building practices which help them stay disease free. And They are very very healthy, no diseases, no chemicals.