Silk production by the carmine spider mite, Tetranychus cinnabarinus (Boisduval) was compared on seven host plants (bean, rose, sweet potato, hibiscus, castor bean, cotton and Algerian ivy). Most silk was spun on bean, least on Algerian ivy. A very good correlation was obtained between amounts of web produced and number of eggs deposited on each host plant. The resultant, host-specific regressions are taken to indicate the differential allocation of plant resources to oviposition or to webbing.