The longer the transit time of apples after DCA removal the higher the SE incidence once fruit is exposed to higher temperatures

After diphenylamine was removed from the list of authorized pesticides in Europe (initiated in 2009), Chilean growers and packers had to search for other technologies to maximize superficial scald (SE) control on apples. Thus, dynamic controlled atmosphere storage (DCA) was rapidly adopted by large size operations. Chilean fruit travels long distances to international markets, therefore, after fruit is removed from DCA it might be maintained for 60 or more days in cold storage (including travel time) before reaching the final consumer. This situation has challenged DCA?s capability to control SE. The objective of this work was to assess SE expression on fruit stored in DCA and then maintained in cold storage for up to 90 days. Fourteen batches of fruit were sampled from 5 commercial DCA rooms located in the Maule Region, Chile. Three replicates (300 fruits each) were stored 30, 60, and 90 days in RA (0-1?C, >90% RH) plus 14 days at 22?C after having been removed from commercial DCA rooms. Maturity indices (color, firmness, soluble solids, ethylene), SE incidence, and metabolites associated to SE (a-farnesene, conjugated trienes) were evaluated after each storage period. Superficial scald symptoms appeared as light brown patches diffused into the skin in all batches evaluated. After 30 days in RA, 58% of the batches had between 1-32% SE, after 60 days 79% of the batches had between 3-95% SE, and after 90 days 100% of the batches had between 6-100% incidence. Fruit maturity pre-DCA storage is discussed. No differences in metabolites were found among batches with different SE levels. There were no statistical differences in any of the maturity indices evaluated between fruit batches. In conclusion, the longer the transit time (in low temperature) of the fruit after DCA removal the higher the SE incidence once fruit is exposed to higher temperatures. ? Original title and sources Superficial scald assessment on Granny Smith apples stored under dynamic controlled atmosphere in commercial operations in Chile, O. Hernandez y Carolina Andrea Torres, cartorres@utalca.cl, Universidad de Talca, Talca, Chile V Postharvest Unlimited, ISHS International Conference, 10-13 June 2014, Cyprus, http://web.cut.ac.cy/postharvest/ The picture belongs to Escaldadura superficial: fisiolog?a y control, Gabriela Calvo (available below), superficial scald in ?Granny Smith? apple ? Key words Poscosecha??????? postcosecha????? postharvest?????? na-oes? ?????????????? ?????????????????????? post-r?colte????? ???? ?? ??????????????????????????????????????? na-oogst???????????? post-raccolta???? Obr?bka po?????? p?s-colheita????? ???????????????????????? hasat sonras????? ??????????????? Ernte???? ????????????????????????? ???? ?????????????????? postcollita?????????? poskliz?ov頠???? ?????? ????????????????? ??????????????? nakon branja???? pozberov頠?????????????????????? obdelovanje zemlje po??????????????? post-colleita????? ??????????????? pascapanen??????????????? ?il?onn postharvest??????? ????????????? p?c ra?as???????????? derliaus apdirbimas polepas tuai??????????? ??????????? post-recoltare???????????? ?????? ?????? ???????????????????????? ?????????????????????? ??????????????????????????? sau thu ho?ch??????????????? ?????????????????????????????? zangemva kwenkathi yokuvuna Manzana????????????????????????? apple??????????????????? ??????? ?????? ??????????????? pomme?????????????? ???????? ??????????? appel??? mela ???? jab?ko?? ma?㠠?? ????????????????????? elma????? ???????? Apfel??????????????????? ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ?