oa Journal of the Entomological Society of Southern Africa - The bionomics of the South African citrus psylla, Trioza erytreae (Del Guercio) (Homoptera: Psyllidae). 6. Final population studies and a discussion of population dynamics



New population studies on T. erytreae in Swaziland are descriptionbed from November 1968 to January 1970 when the study was discontinued. Severe weather extremes in the mid and late summer of the 1968-69 season resulted in extremely low population densities of T. erytreae in which parasite activity was seriously disturbed. Parasites only recovered during the midsummer of the following season. Low population densities of citrus psylla recorded in the 1969-70 season were explained by the unusually low winter nucleus population at the start of the season, the occurrence of lethal weather and irregular flushing rhythm.


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