oa Journal of the Entomological Society of Southern Africa - The results of competition between two parasites of the potato tuber moth, Phthorimaea operculella (Zeller)
Copidosoma koehleri Blanchard and Apanteles subandinus Blanchard were introduced into South Africa in 1965-69 and now account for about 90% of parasitism of tuber-moth larvae in potato fields. Every year they undergo a cyclical change in relative numbers. Copidosoma predominates in the first generation of larvae in September (spring), but is rapidly superseded by Apanteles, which predominates from October to December. Thereafter, Copidosoma overtakes Apanteles and comes to outnumber it by about 4:1 in February.
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