It does tease with hidden information by making you want to read the article to see what "this disease" is. And the "unstoppable" bit, while true, reads as very

It does tease with hidden information by making you want to read the article to see what "this disease" is. And the "unstoppable" bit, while true, reads as very sensationalist. A less clickbaity title might be something like: "The Sudden Oak Death fungus has killed a million trees in California, and is no longer stoppable". Or something like that.. I'm no journalist.