First Record of Hesperomyces virescens Thaxter (Laboulbeniales: Ascomycetes) on Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae)

Garcés, Sandra; Williams, R. N.

doi:10.2317/0304.18.1

Cited by 34 publications

(16 citation statements)

References 2 publications

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“…Garcés and Williams (2004) found that infection of H. axyridis males and females in July through August 2002 was 11 and 23%, respectively, but infection of males and females in October through November 2002 was 75 and 20%, respectively; males were more abundant than females in fall collections.…”

Section: Discussionmentioning

confidence: 99%

Influence of Host Gender on Infection Rate, Density and Distribution of the Parasitic Fungus,Hesperomyces virescens,on the Multicolored Asian Lady Beetle,Harmonia axyridis

Riddick¹

2006

Journal of Insect Science

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Hesperomyces virescens Thaxter (Laboulbeniales: Laboulbeniaceae) is a parasitic fungus that infects lady beetles (Coleoptera: Coccinellidae) via horizontal transmission between adults at overwintering and feeding sites. The differential behavior of male and female hosts could have profound effects on intensity of infection and positioning of fungus on the host's integument. The influence of host gender on infection rate, density and distribution of this parasite on the multicolored Asian lady beetle, Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), was determined at a feeding site. Adult H. axyridis were sampled from pecan, Carya illinoinensis (Wangenh.) K. Koch, trees in northern Mississippi, USA, during summer and early fall 2003–2004. Results indicated that the behavior of male or female beetles on pecan trees had only a limited effect on the intensity of infection. When averaged over the entire season, the percentage of H. axyridis infected with H. virescens was not influenced by host gender. In 2003, a seasonal average of 54 and 39% of males and females, respectively, were infected; whereas in 2004, 36 and 41% of male and female beetles, respectively, were infected. The percentage of males infected with H. virescens was correlated with the number of males captured at the site in 2003; infection rate decreased as male abundance increased. Infection rate did not correlate with female abundance in 2003 or male or female abundance in 2004. Host gender had a considerable effect on the density and distribution of the fungus. Hesperomyces virescens mature thalli were denser on male rather than female beetles. Also, thallus density was often greatest on the elytra, meso- and metathorax, and abdomen of males and elytra of females, than on other body parts, in 2003. In 2003 and 2004, approximately 59 and 97% and 67 and 96% of males and females, respectively, had mature thalli distributed on the elytra. Prevalence of H. virescens thalli on the dorsum of H. axyridis females suggests that mating behavior is important in fungal transmission. However, prevalence of thalli on the dorsum of H. axyridis males suggests that behaviors other than mating contribute to the transmission of H. virescens onto male beetles. Spread of H. virescens ascospores from infected to uninfected H. axyridis adults of different generations, at feeding sites, might be vital to maintaining stable populations of the fungus.

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Section: Discussionmentioning

confidence: 99%

Influence of Host Gender on Infection Rate, Density and Distribution of the Parasitic Fungus,Hesperomyces virescens,on the Multicolored Asian Lady Beetle,Harmonia axyridis

Riddick¹

2006

Journal of Insect Science

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“…2009). This was first recorded on North American H. axyridis in 2002, some 14 years after the ladybird was first recorded as established there (Garcés & Williams 2004; Riddick & Schaefer 2005). It is now extremely abundant on H. axyridis in North America (e.g.…”

Section: Evolutionary Consequences Of Invasionmentioning

confidence: 92%

Harmonia axyridis invasions: Deducing evolutionary causes and consequences

Sloggett

2012

Entomological Science

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I consider evolutionary approaches to deducing factors that have made the ladybird beetle Harmonia axyridis such a successful invader, and the contribution that studies of this species in its native range can make. Work aiming to demonstrate which (pre)adaptations have made the species so successful often fails to compare these putative characters with those of other ladybirds. This has led to a tendency for "argument by design"-type claims on characters widely shared by non-invasive coccinellids. There is good evidence from genetic studies that evolutionary change occurred in invasive populations, contributing to their success. There is some evidence for subsequent evolutionary change after the establishment of invasive H. axyridis, primarily in the native organisms with which the ladybird interacts. I show here that there appears to have been little adaptation in H. axyridis, over about 20 generations, to the alkaloids of one North American native intraguild prey, the ladybird Coleomegilla maculata. Studies of H. axyridis in its native range are important, as they provide a snapshot of the ancestral ladybird, unobscured by subsequent evolutionary change related to its invasiveness. They provide baseline data about phenomena such as interactions with natural enemies and intraguild predation, and they also can provide pointers as to how H. axyridis might further adapt in the regions it has colonized. Harmonia axyridis represents an ideal opportunity for greater international co-operation between scientists studying this species in its native range in Asia and scientists studying it in Europe, America and Africa, where it is an invasive exotic.

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“…One of its natural enemies is Hesperomyces virescens Thaxt., an obligatory biotrofic fungal ectoparasite of the order Laboulbeniales. This combination was described for the first time in Ohio, USA in 2002 [2] and soon afterwards recorded in many other localities in North America ( [3] and references therein). Four years later it was recorded in Belgium [4] and subsequently in the Netherlands (2008), Germany (2008), the United Kingdom (2011), the Czech Republic (2013), Croatia (2013), and Hungary (2014) [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 72%

First record of Hesperomyces virescens (Laboulbeniales, Ascomycota) on Harmonia axyridis (Coccinellidae, Coleoptera) in Poland

et al. 2016

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First Record of Hesperomyces virescens Thaxter (Laboulbeniales: Ascomycetes) on Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae)

Cited by 34 publications

References 2 publications

Influence of Host Gender on Infection Rate, Density and Distribution of the Parasitic Fungus,Hesperomyces virescens,on the Multicolored Asian Lady Beetle,Harmonia axyridis

Influence of Host Gender on Infection Rate, Density and Distribution of the Parasitic Fungus,Hesperomyces virescens,on the Multicolored Asian Lady Beetle,Harmonia axyridis

Harmonia axyridis invasions: Deducing evolutionary causes and consequences

First record of Hesperomyces virescens (Laboulbeniales, Ascomycota) on Harmonia axyridis (Coccinellidae, Coleoptera) in Poland

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