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Incidence of the pitch canker pathogen and associated insects in intact and chipped Monterey pine branches

Published online by Cambridge University Press:  31 May 2012

William R. McNee*
Affiliation:
Division of Insect Biology, University of California, Berkeley, California, United States 94720
David L. Wood
Affiliation:
Division of Insect Biology, University of California, Berkeley, California, United States 94720
Andrew J. Storer
Affiliation:
Division of Insect Biology, University of California, Berkeley, California, United States 94720
Thomas R. Gordon
Affiliation:
Department of Plant Pathology, University of California, Davis, California, United States 95616
*
1Corresponding author (e-mail: [email protected]).

Abstract

In a 2-year study of Monterey pine, Pinus radiata D. Don (Pinaceae), infected with pitch canker, caused by Fusarium circinatum Nirenberg and O'Donnell, less than 2% of symptomatic branches with green foliage were colonized by twig beetles in the genus Pityophthorus Eichhoff (Coleoptera: Scolytidae), whereas approximately 50% of branches with yellow and red foliage were colonized. More Pityophthorus spp. emerged from yellow branches (mean ± SE = 12.1 ± 1.7 per 30 cm) than from red branches (6.9 ± 0.9) at an inland study site (Oakland) but, at a coastal site (Pebble Beach), the means were not significantly different (4.3 ± 0.6 and 3.8 ± 0.7). The mean phoresy rate of all emerging insects was higher at Pebble Beach (17.7 ± 0.6%) than at Oakland (5.3 ± 0.2%). At both sites, there was considerable temporal variation in the proportion of branches colonized by twig beetles, mean numbers of emerging twig beetles, and phoresy rates of emerging insects. Chipping branches reduced the emergence of Pityophthorus spp. and associates by approximately 95%, compared with emergence from intact branches. The pathogen was isolated from 1-year-old branches and chips in up to 68% of samples, but was only recovered from 3-year-old branches in 1 of 46 sampled. It is recommended that recent branch cuttings and chips originating from symptomatic trees not be transported to areas that are believed to be free of the disease.

Résumé

Au cours d'une étude de 2 ans sur des pins de Monterey, Pinus radiata D. Don (Pinaceae), porteurs du chancre fusarien causé par Fusarium circinatum Nirenberg and O'Donnell, moins de 2% des branches à feuillage vert porteuses de symptômes étaient colonisées par des scolytes des rameaux appartenant au genre Pityophthorus Eichhoff (Coleoptera : Scolytidae), alors qu'environ 50% des branches à feuillage jaune ou rouge étaient infestées. Un plus grand nombre de Pityophtorus spp. ont émergé des branches jaunes (moyenne ± écart type = 12,1 ± 1,7 par 30 cm) que des branches rouges (6,9 ± 0,9) au cours d'une étude à un site à l'intérieur des terres (Oakland), mais à un site le long de la côte (Pebble Beach) les moyennes ne différaient pas significativement (4,3 ± 0,6 et 3,8 ± 0,7). Le taux moyen de phorésie de tous les insectes à l'émergence était plus élevé à Pebble Beach (17,7 ± 0,6%) qu'à Oakland (5,3 ± 0,2%). Aux deux sites, il y avait une variation temporelle considérable de la proportion de branches colonisées par les scolytes des rameaux, du nombre moyen de scolytes à l'émergence et des taux de phorésie chez les insectes émergés. La taille des branches en copeaux réduisait d'environ 95% l'émergence des Pityophthorus spp. et autres espèces associées comparativement à l'émergence dans les branches intactes. L'agent pathogène a pu être isolé à partir de branches et de copeaux de bois de 1 an dans 68% des échantillons, mais n'a été trouvé dans les branches de 3 ans que dansl échantillon sur 46. Nous recommandons d'éviter le transport de branches coupées et de copeaux provenant d'arbres porteurs de symptômes dans les zones d'où la maladie semble absente.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 2002

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References

Bonello, P.McNee, W.R., Storer, A.J., Wood, D.L., Gordon, T.R. 2001. The role of olfactory stimuli in the location of weakened hosts by twig infesting Pityophthorus spp. (Coleoptera: Scolytidae). Ecological Entomology 26: 815CrossRefGoogle Scholar
Bright, D.E. Jr, Stark, R.W. 1973. The 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 dissertation, University of California, BerkeleyGoogle Scholar
Dallara, P.L.Storer, A.J.Gordon, T.R.Wood, D.L. 1995. Current status of pitch canker disease in California. California Department of Forestry and Fire Protection Tree Note 20 [California Department of Forestry and Fire Proteciton, 1416 Ninth Street, Sacramento, California, United States 95814]Google Scholar
Drew, J.K. 1963. A revision of the genus Lasconotus Erichson in California (Coleoptera, Scolytidae). MS thesis, University of California, BerkeleyGoogle Scholar
Dwinell, L.D.Barrows, J.B. 1978. Recovery of the pine pitch canker fungus (Fusarium moniliforme subglutinans) from pine (Pinus taeda) plantation and seed orchard soil. Phytopathology News 12: 207 [American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, Minnesota, United States 55121]Google Scholar
Dwinell, L.D.Barrows-Broaddus, J.B.Kuhlman, E.G. 1985. Pitch canker: a disease complex of southern pines. Plant Disease 69: 270–6CrossRefGoogle Scholar
Fox, J.W.Wood, D.L.Koehler, C.S. 1990. Distribution and abundance of engraver beetles (Scolytidae: Ips species) on Monterey pines infected with pitch canker. The Canadian Entomologist 122: 1157–66CrossRefGoogle 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. United States Department of Agriculture Forest Service Miscellaneous Publication 1339Google Scholar
Gordon, T.R.Okamoto, D.Storer, A.J.Wood, D.L. 1998 a. Susceptibility of five landscape pines to pitch canker disease, caused by Fusarium subglutinans f.sp. pini. Hortscience 33: 868–71CrossRefGoogle Scholar
Gordon, T.R.Wikler, K.R.Clark, S.L.Okamoto, D.Storer, A.J.Bonello, P. 1998 b. Resistance to pitch canker disease, caused by Fusarium subglutinans f.sp. pini, in Monterey pine (Pinus radiata). Plant Pathology 47: 706–11Google Scholar
Hackwell, G.A. 1973. Biology of Lasconotus subcostulatus (Coleoptera: Colydiidae) with special reference to feeding behavior. Annals of the Entomological Society of America 66: 62–5CrossRefGoogle Scholar
Hoover, K.Wood, D.L.Storer, A.J.Fox, J.W.Bros, W.E. 1996. Transmission of the pitch canker fungus, Fusarium subglutians f.sp. pini, to Monterey pine, Pinus radiata, by cone- and twig-infesting beetles. The Canadian Entomologist 128: 981–94CrossRefGoogle Scholar
McCain, A.H.Koehler, C.S.Tjosvold, S.A. 1987. Pitch canker threatens California pines. California Agriculture 41: 22–3Google Scholar
Moeck, H.A.Wood, D.L.Lindahl, K.Q. 1981. Host selection behavior of bark beetles (Coleoptera: Scolytidae) attacking Pinus ponderosa, with special emphasis on the western pine beetle, Dendroctonus brevicomis. Journal of Chemical Ecology 7(1): 4983CrossRefGoogle Scholar
Nirenberg, H.I.O'Donnell, K. 1998. New Fusarium species and combinations within the Gibberella fujikuroi species complex. Mycologia 90: 434–58CrossRefGoogle Scholar
Ohmart, C.P. 1981. An annotated list of insects associated with Pinus radiata D. Don in California. CSIRO Division of Forest Research Report 8Google Scholar
Rohlfs, W.M. III, Hyche, L.L. 1981. Colydiidae associated with Ips in southern pines: relative abundance and time of arrival of adults at pines under attack by Ips spp. Journal of Economic Entomology 74: 458–60CrossRefGoogle Scholar
Rohlfs, W.M. III, Hyche, L.L. 1984. Observations on activity and development of Lasconotus pusillus and L. referendarius (Coleoptera: Colydiidae) following arrival at Ips spp.-infested southern pines. Journal of the Georgia Entomological Society 19: 114–9Google Scholar
Schmidt, R.A.Wilkinson, R.C.Moses, C.S.Broerman, F.S. 1976. Drought and weevils associated with severe incidence of pitch canker in Volusia County, Florida. University of Florida Institute of Food and Agricultural Sciences Program Report 76–2Google Scholar
Sokal, R.R.Rohlf, F.J. 1981. Biometry. 2nd edition. 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(6): 913CrossRefGoogle Scholar
Storer, A.J.Gordon, T.R.Wood, D.L.Bonello, P. 1997. Pitch canker disease of pines: current and future impacts. Journal of Forestry 95(12): 21–6Google 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.Wood, D.L.Gordon, T.R. 1999. Modification of co-evolved insect–plant interactions by an exotic plant pathogen. Ecological Entomology 24: 238–43CrossRefGoogle Scholar
Wood, S.L. 1982. The bark and ambrosia beetles of North and Central America (Coleoptera: Scolytidae), a taxonomic monograph. Great Basin Naturalist Memoirs 6Google Scholar