By Mike Taugher - Contra Costa Times

An invasive weed just now taking hold in the Delta could clog water delivery pumps and marinas on a scale never seen here, and state officials say they are nearly hamstrung in trying to deal with it.

Few have even heard of the new threat, South American spongeplant, because it has been found only recently and in just a few places, all in California.

But what they have seen so far has alarmed experts.

"Your jaw drops at what's going to happen," said Lars Anderson, a weed scientist at the U.S. Department of Agriculture's agricultural research service. "The weeds don't stop."[...]

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