Since the 1960s/1970s, the population numbers of the species have been in steady decline in Estonia, having currently reached a stage where the species has lost nearly all of the area where it used to occur, surviving in just 15 isolated communities.
Alates 1960.-70. aastatest on liigi arvukus Eestis pidevalt langenud, jõudes praeguseks seisu, kus liik on kadunud pea kogu varasemalt levikualalt ning säilinud vaid 15 isoleeritud asurkonnana.