Studies on the feeding potential of the coccinellid predator Pharoscymnus horni, Wesmael on the scale insect of sugarcane
Rao, C.S.; Rao, C.S.
Indian Sugar 31(6): 401-403
Pharoscymnus horni (Weise) is an efficient predator of Melanaspis glomerata (Green), an important pest of sugar-cane in Andhra Pradesh, India. Laboratory studies there showed that the adults consumed up to an average of 42.68 adult scale insects/day (1710 throughout the adult life of the beetle) or 90.43 crawlers/day. Beetle larvae consumed an average of 24.05 scale insects/day (217 in the course of development) or 187 crawlers/day. When adults were provided with an artificial diet containing honey, sugar and agar, together with 5-20% by weight of scale-insects, the life-span averaged 11-13 days, as compared with 11 days for the diet without insects and 30 days on sugar-cane. None of the females oviposited when provided with the artifical diets, though they did so readily when transferred to sugar-cane infested with M. glomerata.