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Pathogen Characterization and Fungicide Screening of Stem Canker of Pitaya
Symptoms of pitaya fruits infected naturally by Neoscytalidium dimidiatum in the fi eld. The fl oral bud produced 12 weeks after stem inoculation, and disease symptom occurred 16 weeks after inoculation. (A)–(F) symptoms on fruit appeared 16, 17, 18, 19, 20 and 21 weeks after stem, respectively.
Symptoms of pitaya fruits infected naturally by Neoscytalidium dimidiatum in the fi eld. The fl oral bud produced 12 weeks after stem inoculation, and disease symptom occurred 16 weeks after inoculation. (A)–(F) symptoms on fruit appeared 16, 17, 18, 19, 20 and 21 weeks after stem, respectively.

Author:Hui-Fang Ni, Chiao-Wen Huang, Sui-Li Hsu, Su-Yu Lai, and Hong-Ren Yang*

Abstract:

    Pitaya canker is an emerging disease in recent years which limits the production of pitaya. We inoculated pitaya stems with Neoscytalidium dimidiatum in the field.Initial canker lesion was first appeared 2 weeks after wound inoculation and the formation of black pycnidia was observed 6 weeks after inoculation. The lesion could fall out and form shot-hole symptom 12 weeks after inoculation. The infection could extend from the shot-hole edge and resulted in the collapse of a large area of stem tissue 18 weeks after inoculation. The optimal temperatures for mycelial growth and spore germination of N. dimidiatum were 25–35℃ and 25–40℃, respectively. Mycelial growth was effectively inhibited by Cyprodinil + Fludioxonil, Azoxystrobin + Difenoconazole and Tebuconazole. Spore germination of N. dimidiatum was inhibited by 80% Metiram, 50% Trifloxystrobin,Pyraclostrobin, Azoxystrobin, Azoxystrobin + Difenoconazole and Iminoctadine. These fungicides have been recommended for the control of anthracnose of pitaya, and could also be used to control stem canker of pitaya in the field.

Key words:Pitaya (Hylocereus sp.), Stem canker, Neoscytalidium dimidiatum, Fungicide screening

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Journal of
Taiwan Agricultural Research
Vol. 72, No.3 (2023) ISSN: 2790-086X Vol. 72, No.3 (2023)
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