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The Races of Podosphaera xanthii Causing Melon Powdery Mildew in Taiwan

The susceptible response of different varieties inouclated with Podosphaera xanthii race 1 (left column) and race 5 (right column). The differential varieties (A, B) were 1: Iran-H, 2:Vedrantais, 3:PMR-45, 4:PMR-5, 5:Edisto-47, 6:PI-414123, 7:MR-1 and 8:WMR-29, and other test varieties were Hsianhwa (C, E) and Tainung No. 10(D, F). R:resistant, S:susceptible

Author:Jin-Hsing Huang* and Yu-Hwa Wang

Abstract:

The single-conidium culture method was utilized for the purification of powdery mildew isolates collected from melons. The race identification was conducted by the leaf-disc inoculation on 8 differential melon varieties. From 2001 to 2004, Podosphaera xanthii race 1 was isolated from Wufeng, Lunbei, Tainan, and Bade. The hosts included sensitive cultivars of ‘Golden light’, ‘Honey world’, and ‘Hsianghwa’, and the resistant cultivar ‘Tainung No. 10’. In spring 2005, P. xanthii race 5 was isolated from cultivar Tainung No. 10, and races 1and 5 from the cultivar Hsianghwa. At the same time, both races were isolated from Tainan. When these 2 races were inoculated on leaf discs of Hsianghwa and Tainung No. 10, Hsianghwa showed sensitive reaction to these 2 races; nevertheless, Tainung No. 10 was resistant to race 1 but sensitive to race 5. Among 181 isolates obtained, there were 138 isolates were race 1 and only 43 isolates were race 5. The results showed that there were at least 2 races of P. xanthii on melon in Taiwan, and race 1 was the predominant race.

Key words:Melon, Powdery mildew, Podosphaera xanthii, Race

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Journal of
Taiwan Agricultural Research

ISSN: 2790-086X Vol. 73, No.1 (2024)

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