Mycological Progress

, Volume 16, Issue 4, pp 419–431 | Cite as

Helicocollum, a new clavicipitalean genus pathogenic to scale insects (Hemiptera) in Thailand

  • Janet Jennifer Luangsa-ard
  • Suchada Mongkolsamrit
  • Wasana Noisripoom
  • Donnaya Thanakitpipattana
  • Artit Khonsanit
  • Tuksadon Wutikhun
Original Article
  • 285 Downloads

Abstract

A new genus pathogenic to scale insects (Coccidae, Hemiptera), Helicocollum, is described from Thailand. It includes the three species, H. chanthaburiensis, H. krabiensis and H. surathaniensis. Phylogenetic inferences on the basis of partial sequences of the large subunit of the nuclear ribosomal DNA, translation elongation factor 1-α and RNA polymerase II subunit 1 place the new genus in the Clavicipitaceae, although morphological features of the phialides resemble Hirsutella in the Ophiocordycipitaceae. Within the Clavicipitaceae, Helicocollum is closely related to Aschersonia, Moelleriella, Regiocrella, and Samuelsia, all known as pathogens of scale insects. Helicocollum differs from other scale insect pathogens in having phialides with helical necks and synnematous or sporodochial conidiomata, but pycnidia. Morphological characteristics are evaluated and compared with other asexual morphs producing twisted, undulated phialidic necks or occurring on scale insects.

Keywords

Clavicipitaceae Entomopathogenic fungi Phylogenetics Scale insect pathogens Taxonomy 

Notes

Acknowledgements

This work was supported by National Science and Technology Development Agency (Grant nos. P14-51395, P15-51452 and P15-51424). The authors would like to thank Prof. Morakot Tanticharoen, Drs Kanyawim Kirtikara, Lily Eurwilaichitr and Mrs. Rungsima Tantalakha for their support of the program “Biodiversity studies of entomopathogenic fungi in Thailand.” We are grateful to Mrs. Jiranan Techaprasan, who collected the samples in the Krabi province. We thank Khun Mali, the owner of the orchard, for her kind cooperation. We thank Ms Cheerapha Panyasiri for insect host identification, Prof. Marc Stadler for suggesting the genus name Helicocollum, and Profs. Keith Seifert and RA Samson for sharing information on species with undulate phialidic necks. We are grateful to the Department of National Parks, Wildlife and Plant Conservation for their cooperation and support of our project research. We are also indebted to the two anonymous reviewers and to Dr. Hans-Josef Schroers, the section editor, whose valuable comments and suggestions helped to improve the manuscript.

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Copyright information

© German Mycological Society and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Janet Jennifer Luangsa-ard
    • 1
  • Suchada Mongkolsamrit
    • 1
  • Wasana Noisripoom
    • 1
  • Donnaya Thanakitpipattana
    • 1
  • Artit Khonsanit
    • 1
  • Tuksadon Wutikhun
    • 2
  1. 1.Microbe Interaction and Ecology Laboratory (BMIE), BIOTEC, National Science and Technology Development Agency (NSTDA)Khlong LuangThailand
  2. 2.Nano Characterization Laboratory (NCL)NANOTECKlong LuangThailand

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