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Red palm weevil, Rhynchophorus ferrugineus (Olivier)  was reared in the laboratory during 2011 under cooling incubator at 30 ±1Co. and 85±5% in the Plant Protection Department, Faculty of Agriculture, Zagazig University,Egypt on semi-artificial diet (potato diet) , all developmental stages were recorded including female and male longevity as follows: The egg incubation period ranged from 2-4 days with a mean of 3 days and the percentage of hatchability was 88 %.The total larval period ranged from 45 to 55 days with an average of 50 days and percentage of mortality was 59 %.The pre-pupal period ranged from 4 to 7 days and averaged 6 days and percentage mortality was 66 % .The pupal stage ranged from 5 to 9 days and averaged 8 days and percentage of mortality was 69 %.Adult pre-emergence (remain inside cocoon) period ranged from 3-10 days with mean of 8 days and percentage mortality was 74%.The percent of adult emergence was 80% and the sex ratio percentage was 49.98 % .The male and female longevity were with mean of 40 and 68 days, respectively as the mean pre-oviposition period was 11days, the mean of oviposition period were 50 days and the mean postoviposition period was 7 days. The life cycle for female and male were 71.3 days. The mean number of deposited eggs (fecundity) was 170 eggs/female with fertility of 78.5 %. The generation duration ranged from 71 to 159 days about 115 days for males and ranged from 71 to 181 days 143 days for females.

BIOLOGICAL STUDIES ON RED PALM WEEVIL, R hynchophorus ferrugineus (OLIVIER) REARED ON SEMI - ARTIFICIAL DIET IN EGYPT