Aspirin water is highly effective in preventing several forms of blight. Fusarium and verticillium are the two most notable, both plant diseases will have devastating effects on tomatoes and most other garden crops as well. The diseases are much more common following heavy rains. As per James Wong, of the BBC, plants should be dosed with a water-based aspirin solution when heavy rain is looming in order to enhance the plants resistance. Naturally a heavy rain will wash the solution away so a post storm spray is also advisable.
A US Department of Agriculture study determined that the use of a home made aspirin spray, resulted in a nearly 50 % reduction in blight. The
Salicylic acid in aspirin enhances the plants resistance against microbial as well insect attack. As per the study published in the Annals of Applied Biology - [ Priming Plant Defenses with Aspirin-like Compound ] The salicylic acid in aspirin is effective in fighting disease in the nightshade family, which also includes peppers, eggplant and potatoes.
An aspirin spray also induces resistance to tobbaco mosaic virus in susceptible plants - [ Acetylsalicylic acid (aspirin) induces resistance to tobacco mosaic virus ]
In addition to nightshade family plants the use of aspirin has also been found to enhance stress tolerance in Beans and legumes - See Acetyl salicylic acid (Aspirin) and salicylic acid induce multiple stress tolerance in bean and tomato plants
In corn / maize salicylic acid and benzoic acid also found in aspirin could provide protection against stress from low temperatures . [ Journal
Maydica 2000 Vol. 45 No. 1 pp. 29-33 ] However, it was also found that under the plants normal growing temperatures it could actually be harmful - so it is advisable to avoid this practice durring the normal growing season so far as corn is concerned.
Gorgan University of Agricultural Sciences in Iran found salicylic acid to be a potent plant hormone which increases yields substantially. Soaking the seeds prior to sewing or foliar spray of the aspirin solution led to enhanced growth, and yield as well as a higher vitamin C content of the produce.
Researchers at the University of Rhode Island, suggest adding 250 to 500mg of aspirin to around 4.5 liters of water and spraying plants several times a month. It is effective in preventing the bilghts and in halting their progress in the early stages. It will not cure full blown infestations.
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