Due to the high environmental risk of chemical pesticides, biological control of plant diseases with bio-pesticides are highly encouraged and recommend. Chitosan and oligochitosan are the well-known biological control agent for its nontoxic, biodegradable and biocompatible properties.
Dear Koli,
The chitosan has inhibition activity against bacteria and fungi. Yes, you can use as biological control.
Please read my paper
Chitosan is a registered in USA pesticide (OPP No. 128930) that is used in crop production as a plant growth enhancer and plant defense booster (EPA 2003). In these uses, chitosan is applied to treat field crops, ornamentals, turf, home gardens, and nurseries. Target pests include early and late blight, downy and powdery mildew, and gray mold. Chitosan is exempt from the requirement for a pesticide tolerance (EPA 1995).
https://www.fda.gov/media/83661/download
Chitosan is registered in Russia (Ecogel, chitosan lactate, plant growth regulator), reg. 2016-10-111-417-0-1-3-1 till 19.08.2020.
It was registered in EU as deacetylchitin, C00734, poliglusam for use as fungicide and plant immunity enhancer. It is used in medicine and food industry.
Please take a look at these useful RG links.
Article Chitosan for Eco-friendly Control of Plant Disease
Article Preliminary Study on the Use of Chitosan as an Eco-Friendly ...
Article Chitosan biostimulant controls infection of cucumber by Phyt...
https://www.researchgate.net/publication/315829600_Chitosan_for_Eco-friendly_Control_of_Plant_Disease
The main problem of chitosan application in high diversity of effects linked to minor variation of its properties (weight, charge, chemical modification) that hardly can be controlled in industrial production from diverse sources.
Thanks for useful information and discussion in the thread. In EU chitosan hydrochloride is registered for use as basic substance (Reg. 2014/563), then it can be used in plant protection without LMR and preharvest interval. We had some experience applying it for the control of postharvest decay (where we estimated the contribution of antimicrobial, eliciting and film-forming properties) and grapevine downy mildew. There is a list of products on the market, as some of you said, with different properties and effectiveness, we have some data on their comparison
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