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Twig beetles, Pityophthorus spp. (Coleoptera: Scolytidae), as vectors of the pitch canker pathogen in California

Published online by Cambridge University Press:  02 April 2012

Andrew J. Storer ,
David L. Wood  and
Thomas R. Gordon
Andrew J. Storer*
Affiliation:
School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, Michigan 49931, United States of America
David L. Wood
Affiliation:
Division of Insect Biology, University of California, Berkeley, California 94720, United States of America
Thomas R. Gordon
Affiliation:
Department of Plant Pathology, University of California, Davis, California 95616, United States of America
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Twig beetles in the genus Pityophthorus Eichhoff are known to be associated with the pitch canker pathogen, Fusarium circinatum, in California. Phoresy of the pathogen on these species has been reported to occur when insects emerge from diseased branches and when they infest disease-free, cut branch tips. To demonstrate that twig beetles can vector the pathogen, studies of phoresy and transmission were conducted in a native Monterey pine, Pinus radiata D. Don (Pinaceae), forest. Phoresy was confirmed for both Pityophthorus setosus Blackman and Pityophthorus carmeli Swaine, and P. setosus was shown to vector the pitch canker pathogen when contaminated with fungal spores and caged onto Monterey pine branches. When attractive baits were used to increase visitation to Monterey pines by P. setosus, baited trees were more likely to develop pitch canker than unbaited trees even though the beetles did not tunnel into the host to develop egg galleries. Therefore, twig beetles are competent as vectors of the pitch canker pathogen, and their vectoring activity, though requiring a wound, does not require that they establish egg galleries in the host.

Résumé

On sait que les scolytes du genre Pityophthorus Eichhoff sont associés à l'agent pathogène du chancre poisseux, Fusarium circinatum, en Californie. La littérature rapporte que la phorésie du pathogène sur les insectes a lieu lorsque les insectes émergent de branches affectées et lorsqu'ils infectent les bouts coupés de branches saines. Nous avons mené des études de la phorésie et de la transmission du pathogène dans une forêt indigène de pins de Monterey, Pinus radiata D. Don (Pinaceae), pour démontrer que les scolytes peuvent servir de vecteurs au pathogène. Nous confirmons la phorésie tant chez Pityophthorus setosus Blackman que chez Pityophthorus carmeli Swaine; P. setosus peut servir de vecteur de l'agent pathogène du chancre poisseux lorsqu'il est contaminé avec des spores du champignon et gardé dans des cages placées sur les branches du pin de Monterey. Lorsque nous utilisons des appâts pour augmenter les visites de P. setosus aux pins de Monterey, les arbres porteurs d'appâts sont plus susceptibles de développer l'infection au chancre poisseux que les arbres sans appât, même si les coléoptères ne creusent pas dans l'hôte pour y construire des galeries de ponte. Ces scolytes sont donc des vecteurs efficaces de l'agent pathogène du chancre poisseux et leur activité comme vecteurs exige la présence d'une blessure sur l'hôte, mais ne requiert pas qu'ils y creusent des galeries de ponte.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 136 , Issue 5 , October 2004 , pp. 685 - 693
Copyright
Copyright © Entomological Society of Canada 2004

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References

Bonello, P., Gordon, T.R., Storer, A.J. 2001 a. Systemic induced resistance in Monterey pine. Forest Pathology 31: 99–106Google Scholar
Bonello, P., McNee, W.R., Storer, A.J., Wood, D.L., Gordon, T.R. 2001 b. Role of olfactory stimuli in host location by twig beetles (Coleoptera: Scolytidae). Ecological Entomology 26: 8–15CrossRefGoogle Scholar
Bright, D.E., Stark, R.W. 1973. Bark and ambrosia beetles of California. Coleoptera: Scolytidae and Platypodidae. Bulletin of the California Insect Survey 16Google Scholar
Correll, J.C., Gordon, T.R., McCain, A.H., Fox, J.W., Koehler, C.S., Wood, D.L., Schultz, M.E. 1991. Pitch canker in California: pathogenicity, distribution, and canker development on Monterey pine (Pinus radiata). Plant Disease 75: 676–82CrossRefGoogle Scholar
Dallara, P.L. 1997. Studies on the distribution, interspecific relationships, host range, and chemical ecology of Pityophthorus spp. (Coleoptera: Scolytidae) and selected insectan associates, and their associations with Fusarium subglutinans f. sp. pini in central coastal California. PhD thesis, University of California, Berkeley, CaliforniaGoogle Scholar
Dallara, P.L., Seybold, S.J., Meyer, H., Tolasch, T., Francke, W., Wood, D.L. 2000. Semiochemicals from three species of Pityophthorus (Coleoptera: Scolytidae): identification and field response. The Canadian Entomologist 132: 889–906CrossRefGoogle Scholar
Fox, J.W., Wood, D.L., Koehler, C.S., O'Keefe, S.T. 1991. Engraver beetles (Scolytidae: Ips species) as vectors of the pitch canker fungus, Fusarium subglutinans. The Canadian Entomologist 123: 1355–67CrossRefGoogle Scholar
Furniss, R.L., Carolin, V.M. 1977. Western forest insects. US Department of Agriculture Miscellaneous Publication 1339Google Scholar
Gordon, T.R., Storer, A.J., Okamoto, D. 1996. Population structure of the pitch canker pathogen, Fusarium subglutinans f. sp. pini, in California. Mycological Research 100: 850–4Google Scholar
Gordon, T.R., Wikler, K.R., Clark, S.L., Okamoto, D., Storer, A.J., Bonello, P. 1998. Resistance to pitch canker disease, caused by Fusarium subglutinans f. sp. pini, in Monterey pine (Pinus radiata D. Don.). Plant Pathology 47: 706–11Google Scholar
Gordon, T.R., Storer, A.J., Wood, D.L. 2001. The pitch canker epidemic in California. Plant Disease 85: 1128–39Google Scholar
Hepting, G.H., Roth, E.R. 1946. Pitch canker, a new disease of southern pines. Journal of Forestry 44: 742–4Google Scholar
Hoover, K., Wood, D.L., Storer, A.J., Fox, J.W., Bros, W.E. 1996. Transmission of the pitch canker fungus, Fusarium subglutinans f. sp. pini to Monterey pine, Pinus radiata, by cone- and twig-infesting beetles. The Canadian Entomologist 128: 981–94CrossRefGoogle Scholar
Leach, J.G. 1940. Insect transmission of plant diseases. New York: McGraw-Hill Book Co, IncGoogle Scholar
Lindgren, B.S. 1983. A multiple funnel trap for scolytid bark beetles (Coleoptera). The Canadian Entomologist 115: 299–302Google Scholar
McCain, A.H., Koehler, C.S., Tjosvold, S.A. 1987. Pitch canker threatens California pines. California Agriculture 41: 22–3Google Scholar
McNee, W.R., Wood, D.L., Storer, A.J., Gordon, T.R. 2002. Incidence of the pitch canker pathogen and associated insects in intact and chipped Monterey pine branches. The Canadian Entomologist 134: 47–58Google Scholar
Nirenberg, H.I., O'Donnell, K. 1998. New Fusarium species and combinations within the Gibberella fujikuroi species complex. Mycologia 90: 434–58Google Scholar
Sakamoto, J.M., Gordon, T.R., Storer, A.J., Wood, D.L. 2001. The potential for Pityophthorus setosus to provide infection courts for pitch canker on Pinus radiata. Phytopathology 91: S78Google Scholar
Sokal, R.R., Rohlf, F.J. 1981. Biometry. 2nd ed. New York: WH Freeman and CoGoogle Scholar
Storer, A.J., Dallara, P.L., Wood, D.L., Gordon, T.R. 1994. Pitch canker in California: geographic and host range expansion. California Agriculture 48: 9–13Google Scholar
Storer, A.J., Wood, D.L., Wikler, K.R., Gordon, T.R. 1998. Association between a native spittlebug (Homoptera: Cercopidae) on Monterey pine, and an introduced tree pathogen which causes pitch canker disease. The Canadian Entomologist 130: 783–92CrossRefGoogle Scholar
Storer, A.J., Bonello, P., Gordon, T.R., Wood, D.L. 1999. Evidence of resistance to the pitch canker pathogen (Fusarium subglutinans f. sp. pini) in native stands of Monterey pine (Pinus radiata). Forest Science 45: 500–5Google Scholar
Storer, A.J., Wood, D.L., Gordon, T.R. 2002. The epidemiology of pitch canker of Monterey pine in California. Forest Science 48: 694–700Google Scholar
Wikler, K., Storer, A.J., Newman, W., Gordon, T.R., Wood, D.L. 2003. The dynamics of an introduced pathogen in a native Monterey pine (Pinus radiata) forest. Forest Ecology and Management 179: 209–21Google Scholar