Pest of the Month Mamaki Rust (Pucciniastrum boehmeriae) Photos: Hawaii Department of Agriculture, Plant Pest Control Branch Description: Mamaki rust was only recently observed for the first time in Hawaii. Distribution: Widespread in eastern Asia. On the Big Island, Hawaiian Acres, Kurtistown. On Oahu, in the Koolau Mountains. Hosts: First seen on endemic mamaki, aka mamake or waimea …