Hot water treatment of Japanese pear trees is effective against white root rot caused by <Emphasis Type="Italic">Rosellinia necatrix</Emphasis> Prillieux |
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Authors: | Naoki Eguchi Hirofumi Tokutake Naho Yamagishi |
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Institution: | (1) Nagano Nanshin Agricultural Experiment Station, 2476 Shimoichida, Takamori, Shimoina, Nagano 399-3103, Japan;(2) MK SEIKO CO., LTD, 1825 Amenomiya, Chikuma, Nagano 387-8603, Japan |
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Abstract: | Hot water was dripped into the rhizosphere of Japanese pear trees (Pyrus serotina Rehd. grafted on P. betulifolia Bunge.) infested with the white root rot fungus Rosellinia necatrix Prillieux, to destroy the fungus. Isolates of R. necatrix from diseased roots of Japanese pear were vulnerable to water at temperatures above 35°C, and the fungus was eradicated from
the colonized substrate when water at 35°C was provided for 3 days. The time required to eradicate R. necatrix decreased exponentially with increasing temperature. Japanese pear trees tolerated a temperature of 45°C without reduction
in vigor. Field experiments demonstrated the practical use of hot water drip irrigation (HWD). HWD at 50°C completely destroyed
white root rot mycelia on diseased roots, and many rootlets grew after the treatment. HWD at this temperature caused no injury
to the trees. HWD of diseased orchard trees was assessed in Takamori and Iida in southern Nagano, Japan. The fungus recurred
in two of four trees 28 months after treatment in Takamori and in two of ten trees 16 months after treatment in Iida. The
new mycelia emerged on thick roots deep within the soil. Although there is a possibility of recurrence, HWD treatment is a
practical control measure for white root rot. |
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Keywords: | Rosellinia necatrix Japanese pear Temperature Hot water treatment |
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