Scientific American 15, 1.1.1848
By an experiment made by a Mr. Gilmore of Natchitoches, Texas, a result quite unexpected has started some ideas as to a preventative for the work which destroys the cotton plant. Mr. Gilmore planted last spring, within his field of cotton, a piece of groun in indigo. Thinking that it would yield more in indigo than would be necessary to furnish his family, he ploughed a part of it up, and put in cotton. Thus ploughed before it had germinated, he scattered the seed over his cotton land, and many stocks of it grew with the cotton. When the worms began to devour the cotton, he found to his surprise that the stocks near the indigo were untouched by them. They left, or rather kept away from the rows near the indigo patch. The odour from the indigo plant is known to be pungent and disagreeable.