Yellow latex is the main problem in the mangosteen agribusiness because it is a factor that lowers fruit quality. The objective of this research was to study the effect of fruit spray using various forms of calcium namely CaCl2, Ca(OH)2, and Ca(NO3)2 on the incidence of yellow latex spots, and the physical and chemical properties of a "Leuwiliang subdistrict" mangosteen population. Application of the three forms of calcium in the first year ineffectively reduced yellow latex spots both on the outer part of the fruit and in the aril. CaCl2 application at various doses in the second year effectively reduced yellow latex spots either on the outer part of fruit or in the fruit aril, but the effect was insignificant between the different CaCl2 dosages used. Calcium content in the exo-, meso- and endocarp of the fruit in the first year was significantly different and in several calcium spray treatments was higher than the control (without calcium spray). In the second year, the calcium content of the pericarp with 22.5 g/l CaCl2 was higher than the control treatment but insignificantly different to other CaCl2 spray treatments. The physical and chemical properties of mangosteen fruit following fruit spray treatment in the first and second year were significantly different.
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