Pharmer, I live in sw Missouri, so I my situation might not be too different from yours. I have alot of duckweed problem, also. If the pond is spring fed, the easiest way to control the duckweed is to put crawdads in the pond. They eat anything in that pond and will keep all the duckweed out. I have crawdads in all my spring fed ponds and I have plenty of fish bait and no duckweed. Crawdads do not live in my ponds that arent springfed and they are full of duckweed. I havent got that solution, yet