Abstract
AbstractIn recent years, a system of Integrated Pest Management (IPM) has been introduced in many Swiss apple orchards. It is based on monitoring pests and natural enemies, on a package of selective pesticides and on biological control of phytophagous mites by typhlodromids. Some natural control has also been introduced for aphids and leafrollers. Stability of this approach is offered by natural control and by monitoring. Risks exist in two fields: Selective pesticides may disappear due to resistance and to other undesirable side effects. Outbreaks of secondary pests occur and will continue to do so in the future. In the past few years populations of scale insects and of Grapholita prunivorana (Rag.) have built up to damaging levels in some regions.
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