How do you know if your roses are sick?

Question

I'm in Texas, The leaves are brown and yellow. I have three other rose bushes and they are blooming and are beautiful.

Answer 1

There are only a few things that will make roses sick as you put it. And that are fungus. You will know if you have it if...there are yellow leaves or leaves with black spots on them. Both are caused by fungus and can be corrected with Ortho food, insecticide and fungus Three in One. You just use it like food and it will help alleviate the sick rose of its problems. Also make sure you use good hygiene with them and pick up all old leaves that have fallen and get rid of them. For the fungus will just splash back up on to the good leaves if left there. Happy growing.

Answer 2

I'm in Texas, too, DFW. Powdery mildew and black spot are to be expected, so don't panic. This should be pretty easy to fix. You need to thin the foliage out, especially in the center to get air all throughout the bush. Remove any new canes at the bottom smaller than a pencil. Remove leaves growing close to the ground. Do not water from the top. Water from the bottom and don't let it splash up onto leaves, as this helps diseases to grow. Spray top and bottom of all leaves after removing all the diseased leaves and discarding as others have said here. You can make your own recipe for spray, as follows: "Though there are a number of potent fungicides on the market, nothing beats this homemade recipe: Mix together one tablespoon of baking soda and 2-1/2 tablespoons of highly refined horticultural oil in one gallon of water. Spray a little on lower leaves before covering the entire plant, to make sure it doesn't burn the foliage. If it does, use half as much baking soda. That's it." See below for a really good online lesson about rose bush basics.

Answer 3

What is the specific problem. Where do you live? If you are in zones that have four seasons, roses are finishing up for the year and will no longer produce blooms. The leaves will begin to turn yellow, then brown and will shed. If your roses have little white bugs, these are aphids which are common to roses and they can kill the plant if not destroyed. A little more help with the issue would be good.

Answer 4

Most likely, you've got Black Spot, a common fungal disease that causes the leaves to turn yellow (with variable sized black spots) which then turn brown and crispy before falling off.

It's a bit late in the season if you're in Zone 7 or northward. But next year, consider a new product from Bayer called "All in One." I've used it in Washington D.C. with pretty good luck, and if it works here, it'll work anywhere. Other options include sprays.

Answer 5

Usually they are getting too much or too little water. I would also suggest feeding them, and in California my roses were great when I gave a few rounds brewed coffee grinds, they like a little acid in their soil.
LT

Answer 6

They wilt turn brown and stems become very weak. Pedals may also be falling off.

Answer 7

If they have a runny nose and a fever.