Emphasis should be placed on natural control by the orchard predatory mite Typhlodromus pyri (see ‘Biological control’).
- Application of foliar sprays of fatty acids which are harmful to the orchard predatory mite, should be avoided unless absolutely necessary.
- Programmes of sprays of sulphur to control scab and mildew can also be harmful to the predatory mite though populations tolerant of the sulphur appear to develop eventually.