Relationship between some parameters of fruit ripening with flesh browning disorder in braeburn apple cultivar

One of the important physiological disorders in apple cultivars is “Braeburn Browning Disorder” (BBD) observed as brown spot associated with cavities in fruit pericarp and thus is distincted from other kind of disorders in fruit endocarp. BBD disorder is more occurred in storing time. However, the symptom of the disorder was observed in growth orchard conditions during three test years. This research is conducted in order to determine the best harvest time and consideration of relation incidence of disorder with it. Additionally, the harvest mature parameters including the number of days since full flowering till harvest time, cumulative growth degree day (CGDD), flesh firmness (FF), starch scale (SS), the percent of total soluble solid materials (sugar) (TSS), titratable acidity (TA), weight less (WL) and pH were measured. The results showed that the best harvest time was variable between 154-166 days from full flowering to harvest time during the experimental years (2004-2006) in Mashhad. In the optimum time for harvesting the average of TSS was 15.95%, TA 0.69%, SS 3-3.8%, pH=3.43 and FF 8.49 Kg/N for average of fruit weight 206 gr resulted in lower incidence of disorder during storage. Also, weight less was at the least amount, 18.14 Kg/ton. The total CGDD showed an increase trend 1819-1983 DD. In other word, the more average DD during the specific time for fruit maturity caused the less incidence of BBD and there was a negative correlation between CGDD and Braeburn Browning Disorder incidence.