Unknown disease killing off Florida's state tree

(AP) -- The sabal palm, Florida's state tree, is under attack by a microscopic killer that has scientists stumped. An unknown but growing number of sabal palms in the Tampa Bay area have died from a mysterious disease that researchers are struggling to identify. Even after scientists pinpoint the disease - and that could take years - they will have to learn what insect spreads it. The disease will be tough to stop.

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