Fruit rot of mangosteen caused by Botryodiplodia and their control
1990
Ronnapop Bunjoedchoedchu | Chintana Chana (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Plant Pathology)
Three groups of one month-old mangosteen fruits namely, fresh fruits picked up from the tree, recently-detached fruits and fallen fruits remaining on the ground for a period of time were collected from the orchards in Rayong, Chantaburi and Trad provinces for fungal isolation. Results showed the Botryodiplodia theobromae was a predominate fungus recovered among those three groups. This fungus was mostly isolated from fruits obtained from Rayong followed by Chantaburi and Trad provinces. Pestalotia sp. Phomopsis sp. and Colletotrichum sp. were uncommonly detected from the fruit stem. Pathogenicity test indicated that severity of disease on fruit was increased along with the increasing of inoculation periods (attachment periods of mycelial disc on fruitstem) as well as the degree of ripening development. Eight fungicides namely, imazalil, iprodione, carbendazim, myclobutanil, thiabendazole, benomyl, prochloraz and triforine at concentration of 750, 1,000 and 1,500 ppm were tested for the disease control efficacy. Dipping of the whole fruits for 2 min in 1,500 ppm of carbendazim-imazalil mix was found to be the most promising disease control measure and the protective efficacy was remained for 7 days after treatment.
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