Seasonal Dispersal of the Oak Wilt Fungus by <i>Colopterus truncatus</i> and <i>Carpophilus sayi</i> in Minnesota

Ambourn, Angie K.; Juzwik, Jennifer; Moon, Roger D.

doi:10.1094/pd-89-1067

Cited by 19 publications

(8 citation statements)

References 14 publications

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“…The results of this study were parallel to those reported by Ambourn et al . (2005) in the oak wilt disease‐sap beetle system.…”

Section: Discussionsupporting

confidence: 92%

“…The results of this study were parallel to those reported by Ambourn et al (2005) in the oak wilt disease-sap beetle system. Ambourn et al (2005) reported that sap beetles associated with the disease posed the greatest risk to healthy oak stands when their contamination rates were higher in the spring. Similarly, in the pitch canker pathosystem, both beetle contamination rate and propagule load were higher in the spring and early summer, and therefore the risk of fungal transmission may be greatest during this period of the year.…”

Section: Discussionsupporting

confidence: 89%

“…(2005) in the oak wilt disease‐sap beetle system. Ambourn et al . (2005) reported that sap beetles associated with the disease posed the greatest risk to healthy oak stands when their contamination rates were higher in the spring.…”

Section: Discussionmentioning

confidence: 99%

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Temporal variation in contamination of pine engraver beetles with Fusarium circinatum in native Monterey pine forests in California

et al. 2008

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The relative importance of beetle species associated with Fusarium circinatum -infected Monterey pines was investigated in three Monterey pine forests along the coast of central California, USA from April to November in 2004 and 2005. Fusarium circinatum was frequently isolated from Ips mexicanus and I. plastographus . The mean percentage isolation based upon numbers of I. mexicanus and I. plastographus carrying propagules of F. circinatum was 17·7 and 10·9% in 2004 and 16·7 and 17·3% in 2005, respectively. The mean percentage isolation was high in the spring and early summer and low in late summer and autumn in all three locations for both species. Isolation was higher from beetles emerging from harvested F. circinatum -infected pine-stems than for trapped beetles, 42·4% for I. mexicanus and 45·9% for I. plastographus . The mean ( ± SE) propagule load of trapped I. mexicanus was 269·5 ( ± 14·1) in 2004 and 281·7 ( ± 35·7) in 2005 and was 216·1 ( ± 28·9) in 2004 and 251·9 ( ± 28·4) in 2005 for I. plastographus . Mean propagule loads decreased from May to November in all locations for both species. Propagule loads of beetles emerged from infected stems were lower than that of trapped beetles, with means of 89·4 ( ± 23·2) and 93·0 ( ± 23·2) for I. mexicanus and I. plastographus , respectively. Thus beetles must acquire fungal propagules from more than one infected host. These results also suggest that higher contamination rates and propagule loads in spring and early summer may indicate a higher risk of pitch canker transmission, relative to late summer or autumn.

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“…The results of this study were parallel to those reported by Ambourn et al . (2005) in the oak wilt disease‐sap beetle system.…”

Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 89%

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Temporal variation in contamination of pine engraver beetles with Fusarium circinatum in native Monterey pine forests in California

et al. 2008

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“…These findings support the continued use of aerial surveys for P. ramorum in Oregon's forested landscapes. Investigation of the relative importance of multiple putative insect vectors of Ceratocystis fagacearum (the oak wilt fungus), a long-established pathogen, led to the conclusion that a nitidulid beetle is the principle vector species of oak wilt (Ambourn et al 2005;Juzwik et al 2004), whereas the smaller oak bark beetle (Pseudopityophthorus minutissimus) is minimally important in pathogen transmission in Minnesota (Ambourn et al 2006). Frequencies of pathogen-contaminated nitidulid beetles (Colopterus truncatus and Carpophilus sayi) present in freshly made wounds, and the nearly immediate arrival of C. truncatus to such wounds, have fostered greater adherence for following guidelines for removing recently wilted red oaks (sanitation), disposing of diseased material, and developing harvesting guidelines to reduce the potential for new infections via insect transmission.…”

Section: Invasive Pathogens Of Treesmentioning

confidence: 99%

Management of Landscapes for Established Invasive Species

Poland

Juzwik

Rowley

et al. 2021

Invasive Species in Forests and Rangelands of the United States

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Long-term management strategies are invoked once an invasive species has become established and spread beyond feasible limits for eradication or containment. Although an invasive species may be well-established in small to large geographical areas, prevention of its spread to non-affected areas (e.g., sites, regions, and cross-continent) through early detection and monitoring is an important management activity. The level for management of established invasive species in the United States has increasingly shifted to larger geographical scales in the past several decades. Management of an invasive fish may occur at the watershed level in the western States, with watershed levels defined by their hydrologic unit codes (HUC) ranging from 2 digits at the coarsest level to 8 digits at the finest level (USGS 2018). Invasive plant management within national forests, grasslands, and rangelands can be implemented at the landscape level (e.g., Chambers et al. 2014), although management can still occur at the stand or base level. Landscapes in this chapter refer to areas of land bounded by large-scale physiographic features integrated with natural or man-made features that govern weather and disturbance patterns and limit frequencies of species movement (Urban et al. 1987). These are often at a large physical scale, such as the Great Basin.

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“…A sap beetle contaminated with a single ascospore mass of C. fagacearum could have been blown into the southern United States, but would have needed to visit a fresh wound on a susceptible oak in order to establish the pathogen. The probability of any of these insect-mediated events happening is extremely low based on what is known about the frequency of contaminated insect dispersal within non-oak wilt stands within the range of oak wilt (3).…”

Section: Possible Pathway Of Introduction To the United Statesmentioning

confidence: 99%

The Origin of Ceratocystis fagacearum, the Oak Wilt Fungus

Juzwik

Harrington

MacDonald

et al. 2008

Annu. Rev. Phytopathol.

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The oak wilt pathogen, Ceratocystis fagacearum, may be another example of a damaging, exotic species in forest ecosystems in the United States. Though C. fagacearum has received much research attention, the origin of the fungus is unknown. The pathogen may have been endemic at a low incidence until increased disturbances, changes in land use, and forest management created conditions favorable for disease epidemics. The host genus Quercus contains some relatively resistant species native to the United States, further supporting the hypothesis that the pathogen is native in origin. However, there are also many common, highly susceptible Quercus species--a characteristic typical of introduced pathogens. Most convincingly, studies have shown that the known populations of C. fagacearum have experienced a severe genetic bottleneck that can only be explained by a single introduction. The weight of evidence indicates that C. fagacearum is an introduced pathogen, with possible origins in Central or South America, or Mexico.

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Seasonal Dispersal of the Oak Wilt Fungus by Colopterus truncatus and Carpophilus sayi in Minnesota

Cited by 19 publications

References 14 publications

Temporal variation in contamination of pine engraver beetles with Fusarium circinatum in native Monterey pine forests in California

Temporal variation in contamination of pine engraver beetles with Fusarium circinatum in native Monterey pine forests in California

Management of Landscapes for Established Invasive Species

The Origin of Ceratocystis fagacearum, the Oak Wilt Fungus

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