Limited Occurrence of Tristeza in Yuzu and Possible Tristeza-free Cultivation in Northernmost Commercial Yuzu-producing Areas of Japan

Eiko NAGAOKA-NAKAZONO; Nami UECHI; Hiroshi KATOH; Takashi FUJIKAWA; Shin-ichi MIYATA; Tsutomu FURUKAWA; Tomonori ASAKAWA; Makoto SASAKI; Riho KUWAHARA; Ok-Kyung KIM; Hirosuke SHINOHARA; Toru IWANAMI

doi:10.6090/jarq.54.307

Agricultural Environment

Limited Occurrence of Tristeza in Yuzu and Possible Tristeza-free Cultivation in Northernmost Commercial Yuzu-producing Areas of Japan

Eiko NAGAOKA-NAKAZONO, Nami UECHI, Hiroshi KATOH, Takashi FUJIKAWA, Shin-ichi MIYATA, Tsutomu FURUKAWA, Tomonori ASAKAWA, Makoto SASAKI, Riho KUWAHARA, Ok-Kyung KIM, Hirosuke SHINOHARA, Toru IWANAMI

Author information

Eiko NAGAOKA-NAKAZONO
Japan International Research Center for Agricultural Sciences
Nami UECHI
Institute of Fruit and Tea Science, National Agriculture and Food Research Organization
Hiroshi KATOH
Takasaki University of Health and Welfare
Takashi FUJIKAWA
Institute of Fruit and Tea Science, National Agriculture and Food Research Organization
Shin-ichi MIYATA
Central Region Agricultural Research Center, National Agriculture and Food Research Organization
Tsutomu FURUKAWA
Ofunato Agricultural Development and Extension Center
Tomonori ASAKAWA
Iwate Agricultural Research Center
Makoto SASAKI
Iwate Agricultural Research Center
Riho KUWAHARA
Faculty of Agriculture, Tokyo University of Agriculture
Ok-Kyung KIM
Faculty of Agriculture, Tokyo University of Agriculture
Hirosuke SHINOHARA
Faculty of Agriculture, Tokyo University of Agriculture
Toru IWANAMI
Faculty of Agriculture, Tokyo University of Agriculture

Keywords: Citrus junos Sieb. ex Tanaka, Great East Japan Earthquake, Toxoptera citricidus

JOURNAL FREE ACCESS

2020 Volume 54 Issue 4 Pages 307-316

DOI https://doi.org/10.6090/jarq.54.307

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Abstract

Citrus tristeza virus (CTV) commonly infects yuzu (Citrus junos) in most parts of the citrus-growing areas in Japan. This study examined the occurrence of CTV in the northernmost commercial citrusproducing areas of Japan. Colonies of the brown citrus aphid (Toxoptera citricidus) were detected within the areas investigated. However, 23 of the 41 trees that were examined by RT-PCR and both or either subject to stem-pitting observation and immunostrip testing were free of CTV. Several CTVfree trees were apparently more than 60 years old. A field trial revealed that all eight uninoculated seedlings tested negative for CTV at 52 months after transplanting. These results suggest that CTVfree yuzu production is possible in the Rikuzen-Takata and Ofunato areas of Japan.

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