Biochemical changes by insecticides zyxwv to egg production in zyx S. littoralis zyx 45 zy ESAAC, E. G.; EL-GOGARY, S.; ABDEL-FATAH, M. S.; MAHER ALI, A., 1972: Effect of arathion, and endrin on zyxwv egg production and per cent pupation of the zy - TAKLA, N. S., 1975: Free amino acids and protein content in larval haemolymph of the HANNA, M. A., 1970: New insecticides and its metabolism in the Egyptian cotton leafworm, LOWRY, 0.; ROSEBROUGH, N. J.; FARR, A. L.; RANDALL, R. J., 1951: Protein measurement NASR, E. A.; NAGIB, M. A., 1962: The effect of field application on the number of egg- PERRY, A. S., 1964: The physiology of insecticide resistance by insects. In: ROCKSTEIN, M. TELFER, W. H., 1965: The mechanism and control of yolk formation. Ann. Rev. Entomol. carbaryl methyl Egyptian cotton iafworm, Spodoptera littoralis (Boisd.). 2. ang. Ent. 71, 236-270. Egyptian cotton leafworm. 2. ang. Ent. (in press). Spodoptera littoralis (Boisd.). Ph. D. Thesis, Ain Shams Univ. with Folin phenol reagent. J. Biol. Chem. 193,265-275. masses of Prodenia litura Fab. 3rd Cotton Conf. Cairo 4, 1493-1502 (in Arabic). (ed.), The Physiology of Insecta. Vol. 3. New York: Academic Press. 10, 161-184. UMBREIT, W. W.; BURRIS, R. H.; STAUFER, J. P., 1964: Manometric Techniques. Minneapolis, WIGGLESWORTH, V. B., 1965: The Principles of Insect Physiology. London: Methuen & Minnesota: Burgess. Co. Ltd. Faculty of Agriculture, Ain Shams University, Cairo, Egypt Effect of artificial diets on certain biological aspects of the silkworm, Bombyx mori L. By M. F. EL-SHAARAWY, A. A. GOMAA, Y. S. SALEM and M. A. RIZK Abstract Feeding the silkworm larvae, Bombyx mori L. from the beginning of the first instar on four types of artificial diets recommended by different authors, larvae failed to moult and death was common among all individuals. When larvae were fed from the beginning of the second or fourth instar on these diets, the least percentage mortality of larvae with the highest weights of larvae, pupae and fresh cocoons and maximum percentage of moth emergence were obtained when larvae were reared on the semiartificial diet suggested by FUKUDA et al. (1961) containing mulberry leaves partly. 1. Introduction Mulberry leaves constitute the main food for larvae of the silkworm, zy Bom- byx mori. Since mulberry leaves trees shed their leaves during winter and natural food for silkworm becomes very scarce during this period. To make rearing possible all the year round, the use of an artificial diet seems to be a necessity. Many types of artificial diets were recommended by various authors (FUKUDA et al. 1960 and 1961; ITO and HORIE 1962; FUKUDA 1963). 2. ang. Ent. 80 (1976), 45-50 @ 1976 Verlag Paul Parev, Hamburg und Berlin TC..-.? -.