Unharvested bolls harbor the larvae, so these are destroyed. Other opened cotton bolls were damaged, while soybeans were blown down, making mechanical harvesting difficult. By 1000 BCE, Peruvian cotton bolls were indistinguishable from modern cultivars of "G. barbadense". Open cotton bolls and corn were beaten down by the precipitation. Under natural conditions, the cotton bolls will increase the dispersal of the seeds. They damage cotton bolls by staining as well as by cutting the fibres. The arms depicts three cotton bolls and the River Darwen which runs through the town.