Insect could help fight spread of tamarisk. residents who have battled with the invasive tamarisk, or salt cedar, could find relief in the form of a beetle. The Colorado Department of Agriculture is introducing a beetle - the only known natural enemy of the tamarisk. The beetle comes from Asia, where tamarisk first originated. The tamarisk is an invasive, nonnative plant that was originally brought to the United States from Asia to control erosion. But the noxious shrub is said to cover 10,000 acres in Montezuma County. It can have roots that run as deep as 100 feet and can...