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On the population dynamics of Hyalopterus pruni Geoff Hom, Aphididae in Tunis Sur la dynamique des populations de Hyalopterus pruni Geoffroy Hom, Aphididae dans la region de Tunis


On the population dynamics of Hyalopterus pruni Geoff Hom, Aphididae in Tunis Sur la dynamique des populations de Hyalopterus pruni Geoffroy Hom, Aphididae dans la region de Tunis



Journal of Applied Entomology 121(7): 373-382



ISSN/ISBN: 0931-2048

In the Tunis area, the assessment of infestation levels by Hyalopterus pruni Geoffroy on almond trees was established by considering only the proportions of colonies with more than 100 individuals per leaf. High, medium and low infestation levels were recorded during three years, 1992, 1993 and 1994, respectively. However, host infestation often started in mid-February, reached a peak at the beginning of April and then declined and disappeared by the end of May. The responsible factors of this decline related to: 1) the gradual decreasing fecundity of apterae; and 2) alatae migration. On the other hand, the fundatrix larvae survival and reproductive potential expression of apterae were mainly influenced by the phenology and vigour of host plant. On peach tree, infestation was later (beginning of May) but could continue to the end of summer. The decline of population could be associated with premature leaf fall. Except for this, the combined effect of migration and natural enemies were allowed to maintain aphid population at acceptable level. Among abiotic factors very high summer temperatures (>43degreeC) led to total aphid mortality. The regulatory action of these factors has been analysed and discussed.

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Accession: 038504977

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Related references

Sur la dynamique des populations de Hyalopterus pruni Geoffroy (Hom., Aphididae) dans la région de Tunis - On the population dynamics of Hyalopterus pruni Geoff. (Hom., Aphididae) in Tunis. Journal of Applied Entomology (1986) 121(7): 373-382, 1997

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