oa Journal of the Entomological Society of Southern Africa - The bionomics of the South African citrus psylla, Trioza erytreae (Del Guercio) (Homoptera: Psyllidae) 3. The influence of extremes of weather on survival

Volume 32, Issue 2
  • ISSN : 0013-8789



Field studies in the eastern Transvaal and Swaziland citrus areas showed that extremes of weather play a predominant role in regulating population fluctuations of T. erytreae. Populations were consistently the highest in the cool, moist upland region of each study district and were always low and isolated in the hot, arid lowlands. There was a trend for higher populations to develop in mild seasons or following spells of cool, overcast weather during the summer months. The insect favoured well-shaded breeding sites in the lower section of tree canopy, was frequently found in large numbers near windbreaks, and rarely colonized small trees in the hot regions during the summer months.

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