oa Journal of the Entomological Society of Southern Africa - On the biology of the South African Citrus Psylla, Trioza erytreae (Del Guercio) (Homoptera: Psyllidae)
In the past few years the psylla, Trioza erytreae (Del Guercio), has become increasingly important as a pest of citrus in areas of South Africa, particularly the Transvaal, both for its deleterious effect in stunting and deforming new growth and as a vector of the virus disease known as ""greening"" (McClean & Oberholzer, 1965 a and b; Schwarz, 1964, 1965). Because of its importance it is surprising that there are so few accounts of the biology of this insect. The first account was that of Van der Merwe (1923, republished with addenda 1941) which gives a descriptionption of the habits and life history of the psylla including length of development and approximate size of the various stages.
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