Stem and root rot in hydrangea caused by Pythium myriotylum and Globisporangium spp. and susceptibility of hydrangea cultivars

Nagashima, Susumu; You, Xiaodong; Uzuhashi, Shihomi; Tojo, Motoaki

doi:10.1007/s10327-021-00989-9

Cited by 4 publications

(8 citation statements)

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“…isolate H1 (MAFF245235). Hydrangea plants at each of the five growth stages were inoculated with each isolate according to the method described by Nagashima et al (2021). The inoculated plants were maintained at 9.4-37.0°C (mean.…”

Section: Methodsmentioning

confidence: 99%

“…Stem and root rot of hydrangea is caused by the oomycete pathogens Pythium myriotylum, Globisporangium splendens, Globisporangium spinosum, and Globisporangium sp., and is associated with a significant reduction in the quality of plant products (Nagashima et al, 2021). Our field observations had previously revealed that the disease causes severe damage to potted hydrangeas at 1 to 2 months after transplanting (Nagashima et al, 2020).…”

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confidence: 88%

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Relationship between plant growth stage and disease severity in stem and root rot of hydrangeas

Nagashima¹,

Tojo²

2021

Ann. Rept. Kansai Pl. Prot.

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In this study, we examined the relationships between plant growth stage and disease severity in hydrangeas infected with stem and root rot. Hydrangeas were inoculated with four oomycete pathogens (Pythium myriotylum, Globisporangium splendens, Globisporangium spinosum, and Globisporangium sp.) at 0, 1, 2, 3, and 4 months post-transplantation. Plants inoculated with all four pathogens showed disease symptoms until at least 1 month after transplanting; however, the damage caused to plants was found to become less severe with a lengthening of the post-transplantation period prior to pathogen inoculation. Only one of the four oomycete pathogens (Globisporangium sp.) caused significant damage to hydrangeas when inoculated at 4 months after transplanting.

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Section: Methodsmentioning

confidence: 99%

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confidence: 88%

Relationship between plant growth stage and disease severity in stem and root rot of hydrangeas

Nagashima¹,

Tojo²

2021

Ann. Rept. Kansai Pl. Prot.

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“…Stem and root rot has been recently recorded on hydrangea in Japan (Nagashima et al 2021a). Increased cultivation of susceptible cultivars may be the main contributing factor to the occurrence of the disease.…”

Section: Occurrencementioning

confidence: 99%

Hydrangea Diseases in Japan

NAGASHIMA

Tojo²

2023

JARQ

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The genus Hydrangea comprises 70-80 species, some of which have economic importance as flowering plants. Japan has at least 71 hydrangea diseases and approximately one-third of the world's recorded hydrangea diseases. A large number of hydrangea diseases in Japan are known primarily due to the long history of disease studies since 1892, and the pathogen diversity caused by Japan's high humidity and temperature ranges. Recently, new diseases have been found in several high-value cultivars that have been grown as potted plants in greenhouses in Japan. Such growing environments with high humidity and temperature may have enhanced development of the new diseases. An overall risk assessment is needed to ensure proper management of both old and new diseases of hydrangeas. This review lists all known hydrangea diseases recorded in Japan, compared them to global records, and reveals the diversity as well as the uniqueness of the diseases in the country. In addition, eight diseases, i.e., ring spot, bacterial leaf spot, stem and root rot, powdery mildew, gray mold, leaf spot/ stem rot, anthracnose, and leaf spot, which are currently problematic in Shimane Prefecture, Japan, are addressed based on four features: 1) symptoms, 2) distribution, 3) occurrence, and 4) control.

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“…The DNA extraction was performed by the method of Accepted January 22, 2021 Corresponding author: Susumu Nagashima (E-mail: nagashima-susumu@pref.shimane.lg.jp) 関西病虫研報 ( 63) 2021 Nagashima et al (2021). The polymerase chain reaction (PCR) was conducted using the following primer pairs (Staats et al, 2005): G3PDHfor and G3PDHrev for the glyceraldehyde-3-phosphate dehydrogenase (G3PDH) gene, HSP60for and HSP60rev for the heat shock protein 60 (HSP60) gene, and RPB2for and RPB2rev for the secondlargest subunit of DNA-dependent RNA polymerase II (RPB2) gene.…”

Section: Identificationsmentioning

confidence: 99%

“…The PCR cycle condition was the same as that described by Staats et al (2005). Sequencing analyses were performed by the method of Nagashima et al (2021).…”

Section: Identificationsmentioning

confidence: 99%

First report of flower bud rot of hydrangeas caused by <i>Botrytis cinerea</i> in Japan

Nagashima¹,

Tsukamoto²,

Fujihara³

et al. 2021

Ann. Rept. Kansai Pl. Prot.

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Severe flower bud rot was observed in hydrangeas (Hydrangea macrophylla) growing in Shimane Prefecture, Japan. This symptom was observed in potted hydrangeas grown under forcing culture in greenhouses during winter. A gray mold pathogen (Botrytis cinerea) was isolated from rotten buds, and the original rot symptom was reproduced via inoculation with the isolates. The identification of the pathogen was confirmed by morphology and molecular phylogeny. This is the first report of hydrangea flower bud rot caused by B. cinerea in Japan.

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Stem and root rot in hydrangea caused by Pythium myriotylum and Globisporangium spp. and susceptibility of hydrangea cultivars

Cited by 4 publications

References 9 publications

Relationship between plant growth stage and disease severity in stem and root rot of hydrangeas

Relationship between plant growth stage and disease severity in stem and root rot of hydrangeas

Hydrangea Diseases in Japan

First report of flower bud rot of hydrangeas caused by <i>Botrytis cinerea</i> in Japan

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