甘藷基腐病之病原及其對六種不同甘藷品種之感受性分析

Analyses for the Causal Agent of Sweet Potato Foot Rot Disease and Its Susceptibility on Six Sweet Potato Cultivars

10.6715/PPB.201306_55(1_2).0003

沈原民(Y. M. Shen)；劉興隆(H. S. Liu)；趙佳鴻(C. H. Chao)

sweet potato ； plant disease identification ； Phomopsis

植物保護學會會刊

55卷1&2期（2013 / 06 / 01）

25 - 33

繁體中文

In 2009, sweet potatoes with foot rot symptom were collected in Changhua and Taichung. Fungi isolated from the symptomatic tissues were diagnosed Phomopsis destruens (Harter) Boerema, the causal agent of sweet potato foot rot disease, based on the morphology and host range. The internal transcribed spacer (ITS) nucleotide sequences of the fungal isolates were highly identical to that of the foot rot disease pathogen SPPD-1 isolate. All plants propagated from the diseased cutting showed symptoms, but the healthy plants could be obtained using sterilized substrate to cultivate the disease-free parts of the infected sweet potatoes. Inoculation of P. destruens on different cultivars of sweet potatoes, showing that all six tested cultivars ”Tainung No.57”, ”Tainung No.66”, ”Tainung No.71”, ”Tainung No.72”, ”Tainung No.73” and ”Taoyuan No.2” were infected. However, the area under disease progress curve (AUDPC) values of the six cultivars were not significantly different. Linear regression analysis using the severity data of foot rot disease showed the relationship of the disease severities over time (weeks) was y = -7.55 + 1.906x.

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