The defenses of a tomato are typically triggered when a disease takes hold.
You can preemptively trigger the SAR response in tomatoes. The salicylic acid in the aspirin will trigger the tomato's defenses, by mimicking the natural hormone, as if it were being attacked. This defense response is a naturally occurring internal plant process that can be started manually (so to speak) by spraying your tomato plants with aspirin. This response helps a tomato plant fight off bacteria, fungi and other diseases. Tomatoes use a hormone similar to salicylic acid to trigger a response called 'systemic acquired resistance' or SAR.
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