oa Journal of the Entomological Society of Southern Africa - The bionomics of the South African citrus psylla, Trioza erytreae (Del Guercio) (Homoptera: Psyllidae) 5. The influence of host plant quality

Volume 34, Issue 2
  • ISSN : 0013-8789



Field studies and a pot experiment showed that the nymphs of Trioza erytreae undergo prolonged development on poorly nourished citrus leaves. In the field, young growth of poor condition caused high rates of mortality and produced flattened nymphs of reduced size. These effects were apparently intensified under hot midsummer conditions. A series of in situ counts indicated that nymphal survival decreases with an increase in leaf size (age) and that there was a tendency for progressively higher survival towards the apex of the flush point regardless of leaf size.

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