Plants make salicylic acid to trigger natural defenses against bacteria, fungi, and viruses. Aspirin thus is an activator of ‘Systemic Acquired Resistance’ (SAR). However, plants often don’t produce the acid quickly enough to prevent injury when attacked by a microbe. Spraying aspirin on the plants speeds up the SAR response. Tests have shown this works on many crops, producing better plants using less pesticide. “It also makes it possible to successfully grow many fine heirloom varieties which were discarded because they lacked disease resistance.” Powell says.
Scientists first encountered the SAR phenomenon in the 1930s. After encountering a pathogen, plants use salicylic acid as a key regulator of SAR and expression of defense genes. “Only recently have companies begun marketing salicylic acid and similar compounds as a way to activate SAR in crops—tomato, spinach, lettuce, and tobacco among them,” according to Powell.
“ARS scientists are studying plants’ defenses, such as antimicrobial materials like the protein chitinase which degrades the cell walls of fungi, and nuclease enzymes which break up the ribonucleic acid of viruses. They’re also testing aspirin and other SAR activators which could be effective against non-microbial pests such as aphids and root-knot nematodes,” Powell says. “This may be the most important research of the century. Stimulating SAR defenses with aspirin or other activator compounds could result in increased food production and the elimination of synthetic pesticides.”
He recommends we experiment by spraying some plants with a 1:10,000 solution (3 aspirins dissolved in 4 gallons of water), leaving other plants unsprayed. Tests have shown that the SAR activation lasts for weeks to months. (Sort of homeopathic heart attack prevention for your plants.)
Here are links to more info on aspirin for plantsthey also said it improved seed germination.
for roses - they also use h2o2using willow
plant headaches
