Influence of some natural factors on green apple aphid (Aphis pomi Deg.) reduction on apple trees
1991
Olszak, R.W. (Instytut Sadownictwa i Kwiaciarstwa, Skierniewice (Poland))
The impact of known and unknown factors on green apple aphid colonies on apple trees were investigated. Observations were carried out under field condition on isolated and non-isolated apple twigs in an orchard in Central Poland. It was found that in isolated colonies the number of aphids increased markedly and systematically during a relatively long time. At the same time on non-isolated twigs, after an initial increase, continuous reduction up to disappearance of this pests was observed
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