杧果蒂腐病菌潜伏侵染研究

Study on Latent Infection of Mango Stem End Rot Pathogens

对广西大学?果园的两个?果品种果树及果实不同时期带菌情况的调查结果表明,开花期之前一个月就有蒂腐病菌潜伏在春梢上。从各时期组织中至少分离到10种引起?果果实腐烂的真菌,其中DothiorelladominicanaPet.etCif.、BotryodiplodiatheobromaePat.、Diplodinasp.为主要病原菌,Pestalotiopsismangiferae(P.Henn.)Sutton.、PhomopsismangiferaeAhmad为次要病原菌,其它真菌只在一定情况下引起蒂腐病症状。D.dominicana.、B.theobromae和P.mangiferae于开花期之前一个月潜伏侵染枝条,Diplodinasp.从幼果期侵入并潜伏至贮藏期发病,P.mangiferae从青熟果期开始潜伏侵染。

Latent infections of mango stem end rot pathogens were investigated in the trees and fruits of two mango cultivars grown in the mango orchard of Guangxi University at different periods. The results of investigation indicated that some stem end rot pathogens were found to occur endophytically in the shoot prior to flowering. There were at least 10 kinds of fungi causing mango fruit rot that obtained from the period of pre-flowering to post-harvest. Except 9 fungi producing conidia, all of the others belonged to nonsporulating fungi. Among the 9 isolated fungi, Dothiorella dominicana Pet.et Cif, Botryodiplodia theobromae Pat. And Diplodina sp.were the major pathogens that caused mango stem rot in the orchard, while Pestalotiopsis mangiferae (P.Henn.) Sutton. and Phomopsis mangiferae Ahmad were the minor ones. D. dominicana., B. theobromae and P. mangiferae latently infected the shoots perior to flowering, Diplodina sp. invaded fruitlets and made ripe fruits rotten. P. mangiferae latently infected ripeless fruits before harvest.