Provided are compositions comprising (a) a propylene-alpha-olefin copolymer comprising at least about 50%, by weight of the propylene-alpha-olefin copolymer, of propylene-derived units and about 5% to about 35%, by weight of the propylene-alpha-olefin copolymer, of units derived from at least one of ethylene or a C4-10 alpha-olefin, wherein the polypropylene-alpha-olefin copolymer has a heat of fusion of about 75 J/g or less, melting point of about 100° C. or less, and crystallinity of about 2% to about 65% of isotactic polypropylene and (b) a pesticide, preferably a pyrethroid films, filaments, fibers, sheets, molded objects, extruded articles, woven or non-woven materials, yarns, or mosquito nets made therefrom and methods of their manufacture.
