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ISHS Acta Horticulturae 425: II International Pineapple Symposium

A STUDY ON FACTORS INDUCING AND CONTROLLING POSTHARVEST BLACKHEART IN PINEAPPLES

Authors:   T. You-Lin, Z. Yu-Chan, T. Xing-Jie
DOI:   10.17660/ActaHortic.1997.425.65
Abstract:
Blackheart (BH) is one of the physiological disorders causing substantial losses during pineapple storage. In our experiment, BH symptoms appeared in summer fruits after 1 or 2 weeks of storage at 5, 7 and 12°C. Their incidence and severity increased with storage duration and were more serious at 12°C than at 5 or 7°C. Treatment with 150 or 300 ppm GA3 could induce BH in summer fruits when stored at ambient temperature for 1 or 2 weeks after treatment, while control fruits had no BH symptoms when held at ambient for 4 weeks. Therefore, as low temperature, GA3 is also one of the important inducing factors of pineapple BH. In winter, the incidence of BH on pineapples harvested from November to March was about 30–40% or more, incidence and severity being greater when treated with GA3 than in control fruits, and the development of BH was accelerated by storage at 12°C and inhibited by 7°C. Fungicides such as Imazalil, TBZ, Benlate and so on failed to control pineapple BH. Heating at 40°C for 24 hours before storage could reduce the incidence and delay the occurrence of BH. Waxing with SF-wax significantly reduced the severity of BH in fruits stored at 12°C, and the effect of ¼ dilution of SF-wax was the best in all treatments with wax.

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