Launch of herbicide made with biopolymers extracted from citrus peel Researchers from the National University of San Luis have developed a biodegradable blanket made of a biopolymer that is extracted from the peel of citrus fruits, which works as a herbicide and inhibits the growth of weeds. This product, called Ecomanto, also has a unique feature, which is that it is not sold as a roll. It is generated by the user on site by diluting the compound in water. It transforms into a film when sprayed on the ground, as explained by Dr. María Guadalupe García, responsible for the idea, to the specialized medium Argentina Investiga.