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Taiwan Agricultural Research Institute, Council of Agriculture, Executive Yuan--Publication-Special Publication of TARI-No.184

No.184

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Newly Recorded Diseases of Fruit Trees and Floral Crops in Taiwan: Stem Canker of Asian Pear, Bacterial Spot of Japanese Plum, Stem Blight of Eustoma, and Leaf Spot of Kalanchoe

Newly Recorded Diseases of Fruit Trees and Floral Crops in Taiwan: Stem Canker of Asian Pear, Bacterial Spot of Japanese Plum, Stem Blight of Eustoma, and Leaf Spot of Kalanchoe

Shen, Yuan-Min1,2,*, Huang, Tung-Chin1, Chao, Chia-Hung1, Liu, Hsing-Lung1, Wang, Fei-Chen1, Hung, Ting-Hsuan2, Yang, Ya-Ching3, and Fu, Yang-Jen3

ABSTRACT

    Four diseases of Asian pear, Japanese plum, eustoma, and kalanchoe reported recently in Taiwan were introduced and discussed in this article: Neofusicoccum parvum incited the disease of diebacks of twigs and stem cankers in Changhua and Taichung, even though the symptoms are not caused by a specific fungus. Xanthomonas arboricola pv. pruni was isolated from Japanese plum tissues from Lishan, Taichung, including fruits showed black to brown sunken necrotic lesions, leaves with a shot-hole appearance and cankered branches. Sclerotinia sclerotiorum was found on eustoma plants with stem and leaf blight symptoms in greenhouses in Changhua. Rotten lesions on the plant surfaces had white mycelia. Black sclerotia were produced inside the stem. In addition, a Stemphylium fungus was isolated from necrotic spots and scabs of kalanchoe leaves from different regions in Taiwan. The identification of the fungi and bacteria was supported by morphology and nucleotide sequences. The isolates were deposited in the Bioresource Collection and Research Center, Hsinchu, Taiwan. The four pathogens completed Koch's postulates in a greenhouse, showed symptoms identical to those observed in the fields. These results provide basic host-fungus records in Taiwan and benefit the management of the diseases.


1 Taichung District Agricultural Research and Extension Station, Changhua, Taiwan
2 National Taiwan University, Taipei, Taiwan
3 Taoyuan District Agricultural Research and Extension Station, Taoyuan, Taiwan
* Corresponding Author; E-mail: shenym@tdais.gov.tw

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