“…However, the extent of these side-effects may also vary considerably and can not be predicted with reliable accuracy (e.g., Schupp and Ferree, 1988;Ferree, 1992;Mika and Krzewinska, 1995;Baab, 2000;Hilbers, 2004). This applies also to some desirable side-effects of RP, such as improved flower-bud formation (Khan et al, 1998), reduced pre-harvest fruit drop (Schupp and Ferree, 1989;Autio and Greene, 1994), increased dry-matter content (Mika and Krzewinska, 1995;Schupp and Ferree, 1988), increased Ca content of the fruits (Schupp and Ferree, 1987;Vercammen, 1996;Baab, 2000) or reduced incidence of bitter pit (Schumacher et al, 1978).…”