oa Journal of the Entomological Society of Southern Africa - Notes on the occurrence and biology of the sorghum aphid in South Africa



The sorghum aphid, Melanaphis (Longiunguis) pyrarius (Passerini) forma sacchari (Zehntner), is a cosmopolitan species and is distributed widely in South Africa. Laboratory studies on the biology of this aphid indicated that young and mature grain sorghum are equally suitable as host plants. Field studies revealed no significant difference between the specific growth rates of sorghum aphid populations on young and mature grain sorghum. During early summer, grain sorghum aphid populations show an exponential growth rate.


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