Articles

Stem rot of Indian borage caused by Phytopythium helicoides in Taiwan

Article number
1404_65
Pages
485 – 490
Language
English
Abstract
Plectranthus amboinicus (Indian borage) is a common folk medicinal plant.
Its phytochemical properties make it important in pharmacology and nutrition.
In recent years, stem rot of Indian borage was observed in an organic farm in Chiayi County, Taiwan.
Several isolates of a Pythium-like microbe were isolated from the diseased plants.
The pathogenicity test was determined by inoculating zoospore suspension on the cuttings.
Colonies on 5% V8 medium produced aerial mycelia.
Sporangia were subglobose and papillate, which shared similarities with Phytophthora spp.
However, the form of zoospore release was similar to Pythium spp.
Based on the morphology and ITS sequence analysis, the pathogen was identified as Phytopythium helicoides Drechsler.
Currently, there were no research reports indicating P. helicoides caused disease of plants in the Lamiaceae, including Indian borage.
As a result, it was confirmed that Indian borage was a new host for P. helicoides. It is likely that this disease could continuously occur under high temperature and humidity conditions when combining with cultivation practices that tend to cause numerous wounds on the plants during the entire growing season.
Controlling this rapidly spreading disease without the use of chemical agents has posed a significant challenge for the organic farmers.
The present study confirmed that P. helicoides was the pathogen responsible for stem rot of Indian borage.
Further physiological studies of this pathogen are needed for designing effective control strategies suitable for organic farming.

Publication
Authors
H.J. Chien, C.H. Lin, C.H. Kuo
Keywords
new record, oomycetes, pathogen, morphological characterization, Pythiaceae
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