Effect of Calcium Treatment on Oleocellosis Development and External Quality of Citrus Fruit

The effects of foliar spraying 600 × calcium amino acids on Fukumoto navel orange (Citrus sinensis Osbeck cv.Fukumoto navel orange),Lane's late navel orange (C.sinensis Osbeck cv.Lane's Late navel orange),and early gold sweet orange (C.sinensis Osbeck cv.early gold sweet orange),and 1000 ×calcium nitrate on CaraCara Navel orange (C.sinensis Osbeck cv.Cara Cara Navel orange) on oleocellosis development and external quality of citrus fruit were studied.The results showed that calcium treatment significantly reduced the total occurrence of rind oleocellosis,especially for 1st grade incidence of oleocellosis.oleocellosis incidence of Fukumoto navel orange,Lane's late navel orange,early gold sweet orange and CaraCara navel orange fruit decreased from 80%,80%,75% and 82% to 50%,25%,29% and 39%,respectively.However,the 2nd grade incidence of oleocellosis changed irregularly.At the same time,the calcium treatments were found to improve fruit color.