Resistance to phytoinvasions of 22 localities, which have to be specially protected within Eastern European plane,
was analysed by adventization coefficient (percentage of alien species from the total species wealth). Instant
resistance dependence on protection duration is revealed as well as possible dependence on total species and
locality area as mediated by other causes; absence of resistance dependence on geographic latitude is detected as
well. More close investigation of the problem within state program is suggested.

Burda R.I.