Field biology of woolly apple aphid, Eriosoma lanigerum (Hausmann), and its natural enemy, Aphelinus mali (Haldeman), in apple orchards in the Western Cape Province

Heunis J.M. ; Pringle K.L. (2006)

Article

The seasonal cycles of Eriosoma lanigerum (Homoptera: Aphidiae) and its natural enemy, Aphelinus mali (Hymenoptera: Apelinidae), were studied in the Western Cape Province region of South Africa. Crawlers of E. lanigerum migrated from the roots into the apple trees during spring to initiate above-ground colonies. Population numbers peaked at the end of summer. Aphelinus mali became active from February until June. Eriosoma lanigerum numbers declined with the onset of winter but a few colonies remained on apple trees during winter.

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