Plant Immune System Booster
Chitosan is an excellent natural biomolecule which can improve plant health , eliminate the need for synthetic pesticides , and reduce transpiration without lowering crop output . As a solution, chitosan can be applied as a soil amendment or adjuvant, in hydroponics systems, or even directly onto leaves as a foliar spray. Chitosan not only provides an antimicrobial film which prevents mold growth , but it is able to act as a molecule which actually improves the immune system of plants. The similarity of chitosan to natural plant sugars results in a bioactive effect which acts on the molecular level. When applied in soil, it has been shown that chitosan is able to stimulate beneficial microorganisms while inhibiting pathogens . When applied as a foliar spray, plant transpiration is reduced by stomata closure while also providing a barrier against mold, bacteria, and viruses.
In trials it has been show that “spaying tomato plants with chitosan increased all vegetative growth parameters expressed in plant height, number of branches, and number of leaves per plant in the first season and plant height in the second season…” 
For many types of plants, stimulating your plants immune response can increase the concentration and production of sap, resin, essential oils, and your plants size. It can also increase your plant’s resilience when being transplanted. It can even help revive temperature-shocked saplings.
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 El Hadrami, Abdelbasset, et al. “Chitosan in plant protection.” Marine drugs 8.4 (2010): 968-987.
 Bautista-Baños, Silvia, et al. “Chitosan as a potential natural compound to control pre and postharvest diseases of horticultural commodities.” Crop Protection 25.2 (2006): 108-118.
 Bittelli, Marco, et al. “Reduction of transpiration through foliar application of chitosan.” Agricultural and Forest Meteorology 107.3 (2001): 167-175.
 Rabea, Entsar I., et al. “Chitosan as antimicrobial agent: applications and mode of action.” Biomacromolecules 4.6 (2003): 1457-1465.
 Barka, E. Ait, et al. “Chitosan improves development, and protects Vitis vinifera L. against Botrytis cinerea.” Plant Cell Reports 22.8 (2004): 608-614. E.M. El-Tantawy, et al. “Behavior of Tomato Plants as Affected by Spraying with Chitosan and Aminofort as Natural Stimulator Substances under Application of Soil Organic Amendments.” SciAlert