Abstract
The woolly aphid is a serious apple pest. An account is given of the introduction of the woolly aphid parasite (Aphelinus mali) from N.-America into Europe and especially into the Netherlands form France by the Phytopahtological Service in 1924. The initial attempt to establish the insect in Wageningen was succesful. But after some thirty years the woolly aphid is still a serious pest in the Netherlands. This paper outlines the results of investigations made in relation to the influence of Aphelinus mali on its host, the woolly aphid. ... Zie: Summary
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