Crown gall is a bacteria. Aspirin is not an antibiotic. 'Nuff said.

Aspirin does not work by killing the bacteria directly. Plants have their own defenses against bacteria. Salicylic acid triggers the plant's defenses.

Here is a link that might be useful: 2007 review abstract

This article gives the "big picture":

"He adds that an attack by a plant pathogen "marks the start of a war. If the plant can recognize the pathogen and activate its defense arsenal in time, the plant usually wins. But if the pathogen circumvents detection or the defenses themselves, the plant is in trouble. The more we learn about plant immune systems, the better are the chances we can help important crop plants win their war  without the collateral damage from chemical pesticides." "

http://www.sciencedaily.com/releases/2003/12/031209080025.htm

Here is a link that might be useful: link for above

Before we all go out and corner the aspirin market in an attempt to cure all our rose problems, I suggest Henry or a volunteer does the testing of this aspirin remedy and report their results.
Do we really need to clutter the Rose Forum with all these "Should we use aspirin?" postings when one encompassing every rose ill would have sufficed?

I find individual testing of interest; but as has been demonstrated with Harpin: from 3 different testers one often gets 4 different answers.

Even stasticially valid tests with controls from research laboratories can miss an important variable and therefore not be valid under different conditions.

My father was born in 1897 on a Nebraska farm. He was the youngest of 6 boys that survived to adulthood. All of the boys had University educations in agriculture. He stressed that to be a successful farmer (he taught high school agriculture) it is very beneficial to understand one's crops. Thus, I was brought up in an environment that fostered understanding nature.

The nice thing about a forum is that one can pick the topics that one is interested in. For example, some would not be interested in a drought related topic, but may be interested in something related to winter survival, etc.