Leaves of Atractylodes lancea, used in traditional Chinese and Japanese herbal medicines developed irregular-shaped brown lesions in Ibaraki, Japan in 2020. We isolated a fungus from the leaf spots, and in pathogenicity tests, the isolate reproduced these symptoms. The isolate was identified as Alternaria gaisen based on conidial morphology and nucleotide sequences of RPB2, GAPDH, and TEF1. This is the first report of leaf spot of At. lancea caused by Al. gaisen.
Plantations of avocado (Persea americana), a high-demand crop in Thailand are severely affected by Phytophthora spp. A severe avocado root rot disease of avocado that has recently been observed in the Chiang Dao district of Chiang Mai province causes dieback and root rot. A potential pathogen isolated from symptomatic plant material was identified as P. nicotianae based on morphology and ITS and COX1 sequences. Pathogenicity assay on detached leaves and seedling roots confirmed the pathogenicity of P. nicotianae. The report is the first of P. nicotianae causing avocado root rot in Thailand.
In February 2023 in Japan, seedlings of wax gourd [Benincasa hispida (Thunb.) Cogn.] in seedling boxes developed water-soaked rot on hypocotyls typical of damping off and eventually died. A Pythium sp. was isolated from the hypocotyls and was identified as Pythium aphanidermatum based on morphological characteristics and DNA sequence data. The same symptoms developed after seedlings were inoculated with the isolated fungus, and the same fungus was reisolated from the seedlings. This is the first report of damping off in wax gourd seedlings caused by P. aphanidermatum in seedling boxes in Japan.
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