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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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Occurrence, Pathogen Characterization and Control of Phomopsis destruens Causing Foot Rot of Sweet Potato

Occurrence, Pathogen Characterization and Control of Phomopsis destruens Causing Foot Rot of Sweet Potato

Huang, C. W.1, Yang, H. R.1, Lin, C. Y.1, Hsu, S. L.1, and Ni, H. F.1,*

ABSTRACT

    Foot rot disease is a major limiting factor of sweet potato production in recent years. The disease was harmful to commercial root-used varieties of sweet potato, TN57 and TN66, as well as vegetable-used variety, TN71. It suggested that the majority of sweet potato cultivars in Taiwan were not resistant to this disease. The symptoms of this disease included yellowing of leaves, necrotic lesions on vine, and wilting of the sweet potato plants. The pathogen might grow from cankers on the vines down into storage roots, having brown wet rot lesions on the skin of storage root, and caused to severe yield loss and storage disease problems. The fungus generated two types of conidia from stromataic pycnidia on infected vines. The disease seedling was a major inoculum source. Therefore, good quality of seedlings would be an important factor to control the foot rot of sweet potato in the field. It was recommended that the field with the foot root disease should be rotated with rice annually or being flooded for more than 2 wk after harvesting season, and it could eradicate the pathogen as well as avoid the infection of foot rot disease next season. In the chemical control, the result showed that Carbendazim + Hexaconazole and Thiabendazole were effectively inhibited mycelial growth. From all the experimental data, possible integrated control strategies to the disease include (1) cultivating certified healthy seedling, (2) eliminating all disease-infected plants in the field, and (3) adopting flooding treatment or rotation of rice and non-host crops prior to planting season to reduce the pathogen density of the field.

Key words: Sweet potato (Ipomoea batatas), Foot rot diseases, Phomopsis destruens, Disease control


1 Chiayi Agricultural Experiment Branch, Taiwan Agricultural Research Institute
*Corresponding Author: hfni@dns.caes.gov.tw

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