what can i do in rainy weather for black spot and rust on my roses?

Answer 1

Remove all fallen leaves and any infected leaves left on the plant . If rust pustules appear on the canes, prune all infected canes. If disease is severe, chemicals for good control of black spot and powdery mildew as well as rust are triforine (Funginex), sulfur, or lime sulfur.

Milk will get rid of black spot, which is a fungus. Use it as weak as a 1 part milk to 9 parts water. It has potassium phosphate, which boosts the plant's immune system which helps a plant fight off fungi. It has been found to be more effective than the standard chemical fungicides.
I bought infected roses for $2 from two stores. Picked off & discarded all the diseased leaves & sprayed on a weak milk & water solution. I watered only in the morning so the leaves had time to dry.The roses grew new healthy leaves & blossomed beautifully. It's now a yr. later, & not a sign of black spot & the roses are healthy!!!

Milk is a natural germicide. In addition, it contains several naturally occurring salts and amino acids that are taken up by the plant. From previous experiments using sodium bicarbonate, potassium phosphate, and other salts, researchers have found that the disease is sensitive to these salts.

It's important to clean up fallen leaves & allow good air circulation around plants. Even the suposedly black spot resistent Knockout rose had black spot by Sept. when it was crammed together in a display at a store. But heck, I was able to buy their $9.99 rose for $2, & by using milk, water & baking soda, I now have healthy roses. LOL

Mix a handful of cornmeal around your plants. Watering activates the fungus killing properties. You can use up to two pounds of cornmeal worked into the soil for every 100 square feet, once a year.

You can also use:
2 tsp of baking soda with a gallon of water and a few drops of liquid soap (Ivory).

Dormant oil or Bordeaux mixture can be applied for control when plants are dormant (usually in winter).

Good luck treating your roses!

Answer 2

Cut off the sick parts. Prune them to allow more air to flow between the branches. Spray them with sulfur.

Answer 3

treat or spray your roses with a foliar fertilizer with iron in it and a fungicide of any brand. reduce nitrogen fertilizer.