ISHS Acta Horticulturae 231: II International Symposium on Mango
INTERNAL FRUIT NECROSIS OF MANGO AND ITS CONTROL |
| Authors: | S. Ram, L.D. Bist, S.C. Sirohi |
| DOI: | 10.17660/ActaHortic.1989.231.48 |
| Abstract:
Internal fruit necrosis was identified as a new physiological disorder of developing mango fruits. The first visible symptom was the development of dark green colour on the apical part of the fruit and formation of isolated brown areas of indefinite outline in seed and mesocarp of the rapidly growing fruits. The browning of the tissue later on extended to the epicarp and brown black gummy substances exudated from the outer surface of the fruit. However, the fruit tip remained unaffected upto this stage. Subsequently affected mesocarpic tissues collapsed and cavities surrounded by corky tissues developed. In some of the fruits, the disorder was limited to seed necrosis, tapering of fruit-tip and fruit cracking. The disorder was non-pathological and also different from black tip, soft nose and spongy tissue formation in mango fruit. Cultivar Dashehari appeared to be more susceptible to internal fruit necrosis than that of Safeda Lucknow, Bombay Green, Fajri, and Chausa. Langra, however, was free from the disorder. The foliar as well as soil applications of borax decreased the percentage of necrotic fruits and increased the boron levels of leaves and fruits. Boron levels of leaf and fruit showed inverse relationship with percentage of necrotic fruits. Low soil boron coupled with high levels of Ca, free carbonates and pH favoured low boron uptake in leaves and fruits. Nitrogen fertilization increased the incidence of internal necrosis in fruits and decreased the boron content of leaf and fruit. The findings suggest that internal fruit necrosis in mango is a case of boron deficiency. | |
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