Here in SWFL I lost my oldest, largest Bismarckia to the FL palm weevil in 2018, 18 months after Hurricane Irma. Normally they attack compromised Sabals but they’ve developed an appetite for Bizzies. All evidence I’ve experienced, seen, studied and read about convinced me the weevils detect their victims by scent of damage, disease or other compromising conditions. Weevils are not active in winter here but come spring, dying Bizzies release adult weevils that seek out new prey. For years we cut up bars of Ivory Soap (soap, not detergent) then watered them into the crowns of our Bizzies to deter weevil attacks. The tactic worked and we lost no more palms to them. In 2022 Hurricane Ian uprooted 4 of our 6 Bizzies. We have not tried the Ivory Soap treatment since Ian but the two palms seem to be doing okay.
I won’t plant Bismarckias again. They cannot stand up to cat 4/5 hurricanes and do tremendous damage to landscapes and structures when they fall.