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ISHS Acta Horticulturae 795: V International Cherry Symposium CRACKING OF SWEET CHERRIES: PAST TENSE?
The cracking of sweet cherry (Prunus avium L.) fruit due to rainfall poses a very big problem, which will never be solved completely, certainly not in years with high quantities of precipitation. However, there are some promising foliar fertilizers that can strongly reduce the percentage of cracked cherries, namely Frutasol, Nutrileader 469 and Platina. Frutasol was very effective when water was absorbed through the skin in (2002), but not effective at all when water was absorbed through root pressure (2003 and 2004). The product has the qualities of a surfactant and has to be applied beginning at colour change. After application, it should be allowed to dry for 1 to 2 h. If necessary, the treatment has to be repeated after 5 days. After a heavy rainfall, one has to wait 1 to 2 days before applying another treatment. Nutrileader 469 has a base of seaweed that has an effect on stress. The results were variable and the maximum result was 10%. Nutrileader 469 also had an effect on cracking caused by root pressure. Platina has a base of natural amino acids and gave the best results. In 2003 and in 2004, there were 10 to 17% less cracked fruits. The treatment has to be applied beginning at colour change and before exposure to rain at an interval of 7 to 10 days (with a lot of water). The best effect is obtained when applied before rain, but Platina still has an effect when applied after rain or when cracking may be caused by root pressure. When there is an excessive amount of precipitation and/or in case of varieties prone to cracking, it is advisable to increase the dose for each spraying to 1.5 L/ha.