MANUFACTURE AND APPLY PROBIOTIC NANO-EMULSIONS SILVER-NEEM OIL-POLYHEXAMETHYLENE BIGUANIDE FOR KUMQUAT TREES TO PREVENT DISEASE

Abstract

Kumquat is one of the popular ornamental plants every Tet holiday in Vietnam and some Asian countries.
However, according to the surveys, in order to have beautiful products, the use of chemical plant protection
chemicals is unavoidable. Excessive exposure to the above chemicals will affect the health of kumquat
producers and consumers. To overcome and minimize the amount of pesticides, this study presented a safe
biological nano-emulsions from silver, neem oil, polyhexamethylene biguanide (PHMB) with nanoparticle
sizes ranging from 45-96 nm, inhibiting Phytophthora. sp fungi at a concentration of 7.5 ppm on a silver
basis in an in vitro laboratory. At the same time, it had the ability to replace 30% of chemical pesticides
(Redomil gold 68WG and Toplusa 450SC) and was effective in disease prevention of over 81%. Nanoemulsion applied in organic agricultural production was a new direction to initially help reduce the use of
chemicals towards green agricultural production