A variation of Mr. Murphy's Law comes into play with cattails, in relation to a SONAR treatment. If you want to retain the cattails, the SONAR will wipe 'em out. If you want to eradicate them, not a one will die. In general, they'll likely be affected to some degree or another (provided they're inundated in the treated water). Otherwise, eradicating them isn't very likely at typical SONAR use-rates.
