Changes in Stand Structure after the Mass Mortality of Oak Trees in Keihoku Area, Kyoto City, Japan

Itô, Hiroki; Igarashi, Tetsuya; Kinuura, Haruo

doi:10.4005/jjfs.91.15

Cited by 16 publications

(6 citation statements)

References 5 publications

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“…Platypus quercivorus (Murayama) (Coleoptera: Platypodinae) (Murayama 1925), an ambrosia beetle, is a vector for the pathogenic fungus Raffaelea quercivora Kubono and Ito (Ophiostomataceae), which causes Japanese oak wilt (Ito et al 1998; Kubono and Ito 2002; Kinuura and Kobayashi 2006). Platypus quercivorus hosts are trees belonging to the Fagaceae family, with Quercus serrata Thunberg (Fagaceae) and Q. crispula Blume (Fagaceae) being the main targets of this beetle (Kobayashi and Ueda 2005).…”

Section: Introductionmentioning

confidence: 99%

Capture of the oak ambrosia beetle within the host tree canopy

Yamasaki,

Tatsumi,

Ito

2023

Can Entomol

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Because bark and ambrosia beetles fly during their dispersal and host location processes, their flight height is important for assessing their host selection strategy. There is no consensus regarding the height of their dispersal flight in forests, and their method of approaching trees is unclear. This is also the case for Platypus quercivorus (Murayama) (Coleoptera: Platypodinae), which causes Japanese oak wilt by transporting a pathogenic fungus. To clarify the vertical distribution of the flying population of P. quercivorus inside the host tree canopy, interception traps were set up at heights of 1–9 m from the ground near the main trunk of eight host trees, Quercus serrata Thunberg (Fagaceae). Captured beetles were collected between July and October 2022. Hole-boring activities were observed on all trees during the season, and beetles were captured at all heights from 1 to 9 m. Beetle capture probability increased with a decrease in height, and the number of captured beetles increased with a decrease in distance from the main trunk. However, the trap design in this study could not capture individuals coming directly above and must be addressed to elucidate their method of approaching their host plant.

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Section: Introductionmentioning

confidence: 99%

Capture of the oak ambrosia beetle within the host tree canopy

Yamasaki,

Tatsumi,

Ito

2023

Can Entomol

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“…The ambrosia beetle Platypus quercivorus (Murayama) (Coleoptera: Curculionidae: Platypodinae) causes mass mortality of oak trees in Japan, by transporting the pathogenic fungus Raffaelea quercivora Kubono et Shin. Ito, also known as Japanese oak wilt (Ito et al, 1998; Kinuura & Kobayashi, 2006; Kubono & Ito, 2002). The sporadic occurrence of this disease was observed before the 1980s (Ito & Yamada, 1998), however, damages caused by it have continuously occurred since then and the affected areas continue to expand in Japan (Kobayashi & Ueda, 2005) to date.…”

Section: Introductionmentioning

confidence: 99%

Wrong landing on a non‐host occurs under the canopy of a host: The presumed path of the ambrosia beetle Platypus quercivorus to approach its host

Yamasaki,

Tatsumi,

Kobayashi

et al. 2023

Agri and Forest Entomology

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The ambrosia beetle Platypus quercivorus is a vector of a pathogenic fungus that causes Japanese oak wilt. Its host is Fagaceae trees; however, these beetles also erroneously bore into unsuitable, non‐host tree species, which can be affected by neighbouring host tree species and the size of the non‐host. We attached sticky sheets to the host and non‐host tree species of P. quercivorus and counted the number of beetles that landed weekly, in a season of beetle dispersal. We quantified the density of the host canopy above, the basal area of surrounding hosts and the diameter at breast height (DBH) of each non‐host tree. The host canopy density affected the probability of beetles landing on non‐hosts, and the host basal area and non‐host DBH affected the number of beetles landing on non‐hosts. Thus, P. quercivorus is probably initially attracted to a dense host canopy, secondly attracted to the high density of the host and thereafter aggregate onto thick trees, including non‐host species. The number of beetles landing on the surrounding host also affected beetle landing on the non‐hosts, suggesting that landing on non‐hosts is an error that occurs in high frequency during the seasons when many beetles land on the hosts.

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“…If Quercus serrata covers 30% of the canopy and 30% of them die, 900 m 2 /ha of the canopy will become gaps. How such damaged oak forests regenerate depends on the circumstances; sub-canopy trees might grow to canopy trees in some cases (Itô, Igarashi & Kinuura, 2009), and dense floor vegetation such as dwarf bamboo might inhibit regeneration in other cases (Itô, Kinuura & Oku, 2011; Saito & Shibata, 2012). In the latter case, the damaged forests may lack a canopy layer for a long time.…”

Section: Introductionmentioning

confidence: 99%

Changes in understory species occurrence of a secondary broadleaved forest after mass mortality of oak trees under deer foraging pressure

Itô

2016

PeerJ

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The epidemic of mass mortality of oak trees by Japanese oak wilt has affected secondary deciduous broadleaved forests that have been used as coppices in Japan. The dieback of oak trees formed gaps in the crown that would be expected to enhance the regeneration of shade-intolerant pioneer species. However, foraging by sika deer Cervus nippon has also affected forest vegetation, and the compound effects of both on forest regeneration should be considered when they simultaneously occur. A field study was conducted in Kyôto City, Japan to investigate how these compound effects affected the vegetation of the understory layer of these forests. The presence/absence of seedlings and saplings was observed for 200 quadrats sized 5 m ×5 m for each species in 1992, before the mass mortality and deer encroachment, and in 2014 after these effects. A hierarchical Bayesian model was constructed to explain the occurrence, survival, and colonization of each species with their responses to the gaps that were created, expanded, or affected by the mass mortality of Quercus serrata trees. The species that occurred most frequently in 1992, Eurya japonica, Quercus glauca, and Cleyera japonica, also had the highest survival probabilities. Deer-unpalatable species such as Symplocos prunifolia and Triadica sebifera had higher colonization rates in the gaps, while the deer-palatable species Aucuba japonica had the smallest survival probability. The gaps thus promoted the colonization of deer-unpalatable plant species such as Symplocos prunifolia and Triadica sebifera. In the future, such deer-unpalatable species may dominate gaps that were created, expanded, or affected by the mass mortality of oak trees.

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Changes in Stand Structure after the Mass Mortality of Oak Trees in Keihoku Area, Kyoto City, Japan

Cited by 16 publications

References 5 publications

Capture of the oak ambrosia beetle within the host tree canopy

Capture of the oak ambrosia beetle within the host tree canopy

Wrong landing on a non‐host occurs under the canopy of a host: The presumed path of the ambrosia beetle Platypus quercivorus to approach its host

Changes in understory species occurrence of a secondary broadleaved forest after mass mortality of oak trees under deer foraging pressure

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