oa Journal of the Entomological Society of Southern Africa - The bionomics of the South African citrus psylla, Trioza erytreae (Del Guercio) (Homoptera: Psyllidae) 2. The influence of parasites and notes on the species involved

Volume 32, Issue 1
  • ISSN : 0013-8789



Field studies in the eastern Transvaal and Swaziland indicated that parasites are an important limiting factor to populations of Trioza erytreae (Del Guercio), the South African citrus psylla. The degree of parasitism achieved on this extremely fecund psyllid was variable and depended largely on the presence of a favourable synchrony between the two main parasites and the host. During periods of favourable synchrony at least 40-50% of the susceptible stages were found to be parasitized. Under conditions of poor synchrony, however, parasitism frequently dropped below 10%. Parasite activity was relatively unaffected by regular applications of insecticides.

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