Brown-spot resistance among progenies of longleaf plus trees

Harold J. Derr

Treesearch

Brown-spot resistance among progenies of longleaf plus trees

Formally Refereed

Authors:

Harold J. Derr

Year:

1971

Type:

Paper

Station:

Southern Research Station

Source:

Eleventh Conference on Southern Forest Tree Improvement.

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Abstract

Forty wind-pollinated seedlings from each of 227 longleaf pine (Pinus palustris Mill.) plus trees on national forests in Texas, Louisiana, Mississippi, Alabama, Florida, South Carolina, and North Carolina were planted at Alexandria, Louisiana, to test susceptibility to brown-spot infection (Scirrhia acicola (Dearn.) Siggers). After 2 years, family means ranged from 4 to 59 percent of diseased needle tissue. There was strong evidence of resistance among the selected parents, and evidence also of geographic influences. Nearby sources tended to be more susceptible than distant ones.

Citation

Derr, Harold J. 1971. Brown-spot resistance among progenies of longleaf plus trees. Proceedings of the Eleventh Conference on Southern Forest Tree Improvement. 7 p.