Natural crop protection : based on local farm resources in the tropics and subtropics / Natural crop protection in the tropics Stoll, Gaby AGRECOL (Organization) Plants, Protection of Crops 632 MAR 1995 A053 Co. At head of title: AGRECOL Weikersheim, Germany : Margraf Verlag, c1995 c1995 Text 188 p. : ger Tropical agroecology ;