The list of chemical and biological plant protection products permitted for use in the Republic of Armenia includes more than 1,000 drugs with trade names, but about 200 of them are mainly imported. It should be noted that these 200 species are produced in different countries, many of them have the same active ingredient. From this point of view, in order to make the research more focused, it was based on the active ingredients of the drugs, and not on the brand names. As a result of our experiments, a number of mixtures were identified that are absolutely incompatible, as a result of their use, experimental plants get burned, their growth stops, and often dry up. [ABSTRACT FROM AUTHOR]