This weed is massively invading our blueberry farm. We call it "Pond Weed," because, besides in the blueberries, it also grows in our duck pond, at the edge of the water. It's not sensitive to Caseron, and in fact, when we have used Caseron to control other weeds, it seems to be sort of Darwin's survival of the fittest, that this weed grows fruitful and multiplies and grows all over as if it eats Caseron for breakfast and lunch. Do you know the correct name of this plant? and is there anything we could use to control it, which wouldn't also hurt the blueberry bushes? If not, we will just have to go on tediously mowing and weedwacking. Thanks, Will Chamberlain; Wilinda Blueberry Farm, 730 Frankton Road, Hood River OR 97031