Variation in pitch canker resistance among provenances of <Emphasis Type="Italic">Pinus patula</Emphasis> and <Emphasis Type="Italic">Pinus tecunumanii</Emphasis> from Mexico and Central America |
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| Authors: | G R Hodge W S Dvorak |
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| Institution: | (1) Forestry and Environmental Resources, North Carolina State University, 1110 Grinnells Lab, Box 7626, Raleigh, NC 27695, USA |
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| Abstract: | Pinus patula and high-elevation (HE) sources of P. tecunumanii exhibit intermediate levels of resistance to pitch canker (Fusarium circinatum), compared to extremely resistant species such as P. oocarpa, and extremely susceptible species such as P. radiata. Seedlings from 20 P. patula provenances and 15 HE P. tecunumanii provenances were artificially inoculated with the pitch canker fungus at 21 and 12 weeks of age, respectively, and assessed
for resistance 12–20 weeks later. There was important provenance variation in pitch canker resistance for both species. The
20-week LiveStem percentage ranged from 70.3% to 43.6% among the P. patula provenances and 59.6% to 11.7% among HE P. tecunumanii provenances. There was a geographic pattern to the provenance variation, and in both species, low altitude sources demonstrated
more resistance than those from high elevation. Provenance variation in pitch canker resistance could be useful when making
selection and breeding decisions with these species. |
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| Keywords: | Tree diseases Provenance variation Artificial inoculation |
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