Measures to prevent greenish stains on the fruits of the citrus cultivar 'Setomi'
2018
Muramoto, K. | Kanetsune, Y. | Nishioka, M. | Higashiura, Y.
Greenish stains are sometimes observed on the surface of the mature fruits of the citrus cultivar 'Setomi'. These stains, as well as melanoses, decrease the commodity value of the 'Setomi' fruit. Two types of greenish stains have been observed: a smooth surface type and a cracking surface type. Greenish stains were observed on the 'Setomi' fruit in all orchards surveyed in this study; however, the occurrence rate of the damaged fruit varied among orchards. This situation suggested that the greenish stains represented a plant disease. Indeed, during the course of this study, some fungi were isolated from the greenish stains, which were inoculated on the 'Setomi' fruit. This inoculation resulted in certain symptoms resembling the greenish stains, but the specific fungus causing the stains remains unclear. In addition, periodical applications of manzeb WP from the beginning of June to September could decrease the incidence of greenish stains.
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