FLOWER BROWNING AS INFECTION SOURCE WITH ANTHRACNOSE ON JUJUBE
Journal Title: FRUIT GROWING RESEARCH - Year 2016, Vol 0, Issue
Abstract
In the main producing province of jujube Zizyphus jujuba, Gyeongsnagbukdo, disorder of jujube flowers was found. The symptoms were browning of petal and dropping of flowers without fruit setting. The damaged flowers were collected and investigated, and confirmed that disorder of flower was caused on infection by Colletotrichum gloeosporioides. C. gloeosporioides was isolated in 95.4% of discolored flower collected in Gyeongsan area, Aerial mycelium was white in early growth stage but turn to grayish with age. Orange color spore masses were produced outward from the center of the culture. The conidia were cylindrical with both apices rounded or with one apex rounded and the other end pointed. The conidial sizes were 9.2-13.2 x 3.2-5.8 µm. Apressoria were dark grey, ovate to clavate, and size was 5.9-7.2x4.2-5.1 µm. Bark and fruiting twig were surveyed to know overwintering place of C. gloeosporioides and the results are following that C. gloeosporioides was abundantly isolated from fruiting twigs, especially including fruiting twig appeared previous year, but not isolated from bark. This means that the reservoir of infection of anthracnose was considered as fruiting twig appeared previous year.
Authors and Affiliations
Seung-Han Kim, Seok-Hee Park, Min-ki Kim, Sook-Hee Lee
Keywords
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