Only for the brave! A blackspot experiment to try.
This winter, Ginger, one of GW's resident landscapers posted a simple sentence that appeared in the Avant Gardener. Basically the statement indicated that aspirin controls plant fungus problems. This caught my attention as aspirin is a salicylate and I knew that plants cannot absorb it. So, I dug into several months of research, questioning and looking for answers. Perhaps I have unraveled the mystery. Only testing will give us answers. I have already sprayed my roses and tomatoes four times, once a week, with the following and they are thriving to date. No harm to the tender new foliage.
This is the formula....Dissolve 2 regular aspirin tablets in one gallon of water. Add to this 1 (one) tablespoon of a non ionic surfactant***. Shake well and spray on plants (and on the ground around plants) prone to fungal infection such as blackspot/roses. Any solution left in the sprayer tank may be poured around whatever type of plant you are treating.
***I had to search for a non ionic surfactant. The one I found is sold by an organic dealer. It is named A-35 and can be purchased at www.nitron.com. It is expensive.
Caution....this is an experiment. I am confident that it will not harm your roses. I have no idea if it will control blackspot. If you are willing to give this experiment a try, select a few roses that annually have severe BS problems and treat those without adding any other goodies to the spray mix. Just 2 aspirin tablets and one tablespoon of a non ionic surfactant for each gallon of water. Let's see what happens.