Abstract
Abstract A lifetable of the pre-emergent stages for Apion ulicis (Forster) has been prepared from multicohort stage-frequency data and analysed using the Kiritani-Nakasuji-Manly method. This estimates the daily survival rate, the stage specific survival rate, the duration of each developmental stage in days, and the numbers entering each stage. An age specific mortality table has been prepared. An Allee effect is observed between adult weight and the density of adults per pod. Mortality factors within gorse pods appear to be density dependent. The results are discussed in relation to larval life history strategies and the habit of egg clustering by ovipositing females.
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