oa Journal of the Entomological Society of Southern Africa - The bionomics of the South African citrus psylla, Trioza erytreae (Del Guercio) (Homoptera: Psyllidae) I. The influence of the flushing rhythm of citrus and factors which regulate flushing

Volume 32, Issue 1
  • ISSN : 0013-8789



Field studies in the eastern Transvaal and Swaziland citrus areas showed that population fluctuations of the citrus psylla, Trioza erytreae (Del Guercio) are correlated with the flushing rhythm of its citrus host. The prolonged flushing of trees in the cooler, moister upland areas which have a high incidence of the greening disease, was found to be more favourable to T. erytreae than the shorter, well-defined flush cycles which characterize the arid, lowland areas where greening is absent or uncommon. There were 6-7 distinct field generations per annum, the synchrony of emergent adults with growth cycles being of importance to the population.

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