Blackspot disease on roses?

Question

Two of my roses have black spot disease. (i think thats what its called) What is the best organic way to get rid of them? I got chemicals from the store, but the directions were less than clear. They said to use the 7-day plan?? Any other ideas on how to get rid of it?

Answer 1

Bayer makes an All-in-One Rose care product which is very easy to use and very effective.

Answer 2

The reason for the 7 or 10 day application is to break the reproductive cycle. Some parts of diseases as well as insect life cycles are pretty immune to chemical warfare. You must wait for them to enter a more vulnerable stage, thus the repeated sprayings.

For less chemical treatment, yes, first pick off all infected leaves. Wash hands with sanitizer stuff, you don't want to be spreading the infection with gloves or hands. Then you have two courses and I suggest both.

First when the plants are dormant, spray with lime sulfur. This will burn off overwintering disease spores. Make sure the area around the roses have been cleaned as well. Yes, you can spray the ground too if you want. Lime sulfur burns so don't let it blow back onto you and don't get it on wood surfaces, it pits.

The you'll need to put a cover on the leaves to retard the disease spores from germinating on the leaves. Horticultural oil works pretty well. Not dormant oil, if that heavy stuff is still around. Hort oil is lighter and can be applied to leaves. Another spray is buttermilk. Makes the leaves kinda ugly with white spots, but for some reason the latex in milk seems to help stop disease, especially if you mixed in a tablespoon or so of flour before spraying. Be sure to clean the sprayer immediately, you don't need buttermilk clogging up the sprayer!

Finally some roses are more resistant to black spot that others. Plant the resistant ones and avoid those prone to problems. I don't care if they are your favorite rose, a problem plant is a problem plant.

Answer 3

My grandmother used to have numerous rose timber and a few hiking roses. one element she did turn into have my grandfather dig a hollow beside the bush (oftentimes in the previous they planted the rose bush itself) and lay in some ceramic tile to steer the water right down to the roots so the leaves did no longer get moist. She could stick the hose interior the hollow and enable it run on low for a together as to be certain the water could desire to soak into the floor at a slow value. this is available, while you're only wetting the floor on proper, that the roses don't get adequate water to the roots that could reason the leaves to instruct and die out. the different element she did to evade the black spots turn into as quickly as a month, she could gently spray or mist the backside of the leaves, then she used the rose dirt on them. She had the form of container that blew the dirt up like a powder under the leaves so it may carry on with the moist section. this is the place many aphids and different bugs will feed in the event that they get the prospect and which will turn the leaves black and kill out the roses. you may actually have a "male" plant which will bloom as quickly as and that's it. I had a eye-catching rose bush that my grandfather planted for me one time and it have been given those huge diminished yellow w/pink roses yet as quickly as those have been long previous, it turn into only a green vine. The nursery mentioned it turn right into a male plant and that they are familiar to have fewer blooms. It died the subsequent winter so we took it out and that i gave up on roses for a together as.

Answer 4

This is a fungus, so you need to pick off all the affected leaves and through them away. Do not compost them or throw them on the ground.

Here's a website I found, hope it helps.
http://ohioline.osu.edu/hyg-fact/3000/3072.html