1. Anonymous (1998a) Milieubewuste Teelt. Fruitteelt 88(9) Appendix (in Dutch).
2. Anonymous (1998b) SKAL Informatie Handboek, Statuten, regelingen en voorschriften; PR.PR1/A.29
3. Becker CM (1990) Overwintering of the anamorph of Venturia inaequalis (Spilocaea pomi) in apple buds and the viability of conidia as affected by discontinuous wetting. PhD Thesis, Cornell University, USA, 86 pp
4. Overwintering of Conidia ofVenturia inaequalisin Apple Buds in New York Orchards