Asked June 07, 2017, 10:30 AM EDT
Recently, the Detroit News did a story on someone who puts two regular aspirin (one on each side) of each of his tomato plants once a season. He is convinced it keeps them healthy and free of diseases all season. Your opinion on this practice? Could it hurt to try it? Thanks!
Wayne County Michigan
Salicylic acid, a closely related enzyme to acetylsalicylic acid found in aspirin, has been studied in plants for some time.
The studies I reviewed were conducted by universities or the USDA and the salicylic acid was dissolved in water, at very specific doses, and sprayed on the leaves or were used to water the plants. Some doses were toxic and caused yellowing leaves.
This statement is from Cornell University---
"Salicylic acid, the chemical compound found naturally in most plants (as well as in the most-used medication, aspirin), is a plant hormone produced at elevated levels in response to attack by microbial pathogens. According to a report on the Web today in the Proceedings of the National Academy of Sciences (PNAS Early Edition, week of Dec. 7, 2003) by BTI's Dhirendra Kumar and Daniel F. Klessig, the aspirin-like hormone is perceived by the SABP2 protein and a message is transmitted, via a lipid-based signal, to activate the plant's defense arsenal."
This article, from the University of Arizona, is a brief discussion on the history of the research and aspirin use in the garden--- https://cals.arizona.edu/yavapai/anr/hort/byg/archive/plantimmunesystems.html
And this article refers directly to the USDA study on tomatoes---
As the Detroit News article states, in small doses you may see some benefit. You may want to conduct your own experiment and leave at least one third of your tomatoes untreated, or as a backup, if you get an adverse response.