Effect of Calcium Formate Spraying on Black Scratch Disorder of Mango (Mangifera indica L.) Variety ‘Lippens’

Abstract

Mango ‘Lippens’ has the problem that black scratch disorder occurs during the harvest. In order to develop the technology to reduce this disorder, the effect of calcium formate was investigated. Results of field test indicated that, the incidence of black scratch disorder was lower in the calcium formate sprayed plot than in the control plot. In 2017, the incidence of the calcium formate sprayed plot was 2.1% and that of the control plot was 33.4%. In 2018, the incidence of the calcium formate sprayed plot was 8.0% and that of the control plot was 37.5%. The effect of calcium formate spraying on the quality was not obvious. Flesh and peel hardness were measured to investigate the effect of calcium formate spraying on the peel. As a result, the flesh and peel hardness of the calcium formate sprayed plot showed significantly higher values. Analysis of the peel pectin content showed that the content of insoluble pectin combined with calcium was significantly higher in the calcium formate sprayed plot, and the calcium ion content in the extract was also higher. Spraying calcium formate on ‘Lippens’ was thought to form insoluble pectin bound to pectinic acid present in the cell wall, to enhance peel hardness and to reduce black scratch disorder.