Effect of Density upon Larval Survival and Pupal Yield of the Olive Fruit Fly1

Abstract
The effect of larval density upon larval survival, pupal weight, length of developmental time for pupation and adult emergence was studied in 3 stocks of the olive fruit fly, Dacus oleae (Gmelin). Densities of 5-100 eggs/g diet were tested. Hatchability was not affected by egg densities. Larval mortality was high during the 1st 4 days of development but it was not affected by larval density. The percentage of neonate larvae which survived to pupal and adult stage was reduced in the higher densities. In general, high densities produced larval mortality beyond the 4th day, lower pupal weights and a reduction in adult emergence. A difference in pupal weight was recorded between 2 stocks at high densities. Developmental time period for pupation increased by one day when high densities were used.

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