The impact of~owers on the population growth of Frankliniella occidentalis was characterized on wax~ower plants\ Impatiens walleriana[ In the presence of~owers\ the populations grew exponentially while in their absence\ the thrips populations only maintained themselves and showed no growth The di}erence in number and in size of thrips reared in both conditions suggested that the~owers were essential for the success of thrips development[ In the presence of~owers\ the distribution of females between the leaves and the~owers varied strongly according to the availability of owers[ By contrast\ the proportion of _rst larvae in the~owers increased up to the last day of the experiment[
In less than 3 years (1986–1988) Frankliniella occidentalis, imported from USA, had spread throughout Europe. It is a polyphagous Thysanoptera which causes important yield loss in greenhouses, in both vegetable and ornamental crops. However, insufficient data are available on its basic biology. The purpose of this work was thus to establish its life table. A cohort of 95 individuals were observed daily during their whole lifetime. The development time is short, 14.2 days, and no significant difference has been observed between males and females. The mean fecundity is high, as 43.17 larvae were produced by a single female. The intrinsic rate of natural increase is 0.140, meaning that the theoretical population may double in 4.94 days.
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