scholarly journals Families of loblolly pine that are the most stable for resistance to fusiform rust are the least predictable

2003 ◽  
Vol 33 (7) ◽  
pp. 1335-1339 ◽  
Author(s):  
S E McKeand ◽  
H V Amerson ◽  
B Li ◽  
T J Mullin
Keyword(s):  
Loblolly Pine ◽  
Coefficient Of Determination ◽  
Rust Disease ◽  
Infection Level ◽  
Fusiform Rust ◽  
Rust Infection ◽  
Average Coefficient ◽  
Pinus Taeda L ◽  
The Individual ◽  
Pathogen Populations

In an extensive series of trials with open-pollinated families of loblolly pine (Pinus taeda L.), resistance to fusiform rust disease (caused by Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme) at individual test sites was relatively unpredictable for the families deemed most resistant. The most resistant families were also the most stable for performance across test sites, with stability defined as the slope of the regression of family means for rust infection versus site means for rust infection. A family's R-50 value (its predicted rust infection level when the site mean infection is 50%) was correlated to its stability parameter or slope (r = 0.78). On average, any one family's level of infection (% galled) was reasonably predictable for any given infection level at a given site; the average coefficient of determination (r2) was 0.78 for the regression of family means for rust infection versus site means for rust infection. However, the six most stable families for resistance had the lowest r2 values (average r2 = 0.58). We speculated that the lower predictability for the most resistant families was due to interactions of specific resistance genes in these families and corresponding avirulence and (or) virulence levels in the pathogen populations that may differ among sites. Although the predictability of the individual resistant families was relatively low, if these families were bulked into a resistant seed lot, they performed in a more predictable manner with r2 = 0.74 for the regression of the bulk mean versus site means. Bulks of four to six highly resistant families appeared to be a good solution to obtain stable and predictable performance across a range of sites.

Performance of Livingston Parish Loblolly Pine in the Georgia Piedmont

1986 ◽  
Vol 10 (2) ◽  
pp. 84-87
Author(s):  
H. R. Powers
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Coastal Plain ◽  
Source Material ◽  
Atlantic Coastal Plain ◽  
Rust Disease ◽  
Fusiform Rust ◽  
Pinus Taeda L ◽  
Georgia Piedmont ◽  
Atlantic Coastal

Abstract Seedlings of Livingston Parish (Louisiana) loblolly pine (Pinus taeda L.) have been widely used across the Gulf and south Atlantic Coastal Plain to reduce the damage caused by the fusiform rust disease. Since this seed-source material provided the first rust-resistant seedlings available to forestland managers, it was used wherever rust damage was heavy, in some cases into the Piedmont north of the recommended area of planting. This paper evaluates the performance of ten-year-old Livingston Parish trees in such an area. The rust resistance of the Livingston Parish trees was outstanding, with 83% being free of disease as compared with only 14% of the commercial controls. There was no difference in growth between the two groups of trees, and ice breakage was not significantly greater in the Livingston Parish trees. South. J. Appl. For. 10:84-87, May 1986.

scholarly journals Correspondence of Loblolly Pine Response for Fusiform Rust Disease from Local and Wide-Ranging Tests in the Southern United States

2017 ◽  
Vol 63 (5) ◽  
pp. 496-503
Author(s):  
Jesse Spitzer ◽  
Fikret Isik ◽  
Ross W. Whetten ◽  
Alfredo E. Farjat ◽  
Steven E. McKeand
Keyword(s):  
United States ◽  
Loblolly Pine ◽  
Southern United States ◽  
Rust Disease ◽  
Fusiform Rust

Sewage Sludge Increases Early Growth and Decreases Fusiform Rust Infection of Nursery-Run and Rust-Resistant Loblolly Pine

1989 ◽  
Vol 13 (2) ◽  
pp. 68-71 ◽  
Author(s):  
Douglas M. Stone ◽  
Harry R. Powers
Keyword(s):  
Sewage Sludge ◽  
Loblolly Pine ◽  
Volume Growth ◽  
Early Growth ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
First Year ◽  
Average Height ◽  
Fusiform Rust ◽  
Rust Infection

Abstract An intensively prepared site in a high-rust hazard area was fertilized with municipal sewage sludge to provide 300 or 600 lb/ac total nitrogen before planting nursery-run and fusiform rust-resistant seedlings. Rust-resistant seedlings had significantly greater first-year survival andsignificantly lower rust infection at age 6. The sludge treatments increased 6-year diameter and volume growth and decreased rust infection significantly; there were no differences between the two sludge levels. Sludge fertilization significantly increased average height, diameter, and stemvolume of the largest 300 trees/ac and has begun to stimulate crown class differentiation. The greater growth of the larger trees did not alter the proportion infected by rust. Results indicate that even in areas of high-rust hazard, intensive site preparation and sludge fertilization canincrease early growth and accelerate stand development of loblolly pine if rust-resistant stock is planted. South J. Appl. For. 13(2):68-71.

scholarly journals Fusiform Rust Trends in East Texas: 1969-1987

1988 ◽  
Vol 12 (4) ◽  
pp. 259-261 ◽  
Author(s):  
J. David Lenhart ◽  
W. Thomas McGrath ◽  
Terry L. Hackett
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Pinus Elliottii ◽  
Slash Pine ◽  
Pine Plantations ◽  
East Texas ◽  
Infection Rates ◽  
Fusiform Rust ◽  
Cronartium Quercuum ◽  
Pinus Taeda L

Abstract Five surveys of pine plantations in East Texas over an 18-year period (1969-1987) indicated that fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme Birdsall and Snow) infection rates have increased to current levels of about 50% on slash pine (Pinus elliottii Engelm.) and are continuing to increase on loblolly pine (Pinus taeda L.) to 10-15% levels. South. J. Appl. For. 12(4):259-261.

Relation of Nantucket Pine Tip Moth Attack and Fusiform Rust Infection in Loblolly Pine Families

1991 ◽  
Vol 15 (4) ◽  
pp. 204-208 ◽  
Author(s):  
Roy L. Hedden ◽  
Roger P. Belanger ◽  
Harry R. Powers ◽  
Thomas Miller
Keyword(s):  
Loblolly Pine ◽  
Cost Effective ◽  
Growth And Yield ◽  
Insecticide Treatment ◽  
Fusiform Rust ◽  
Rust Infection ◽  
Nantucket Pine Tip Moth ◽  
Combined Control ◽  
Economic Analyses ◽  
The Relationship

Abstract The relationship between pine tip moth attack and fusiform rust infection was studied in a 12-year-old loblolly pine stand in Houston County, GA. Four pine families were selected for study, and 24 trees of each family were felled for evaluation. The lower 8 ft of each tree was cut into two 4-ft sections and split to reveal the pith. Each section was examined for evidence of pine tip moth attack and the presence of fusiform rust galls. The analysis revealed 476 tip moth attacks and 99 fusiform rust galls. Forty-six of the rust galls occurred at the same place as a tip moth attack. These results, when combined with those of previous studies, suggest that the control of the pine tip moth may reduce the incidence of fusiform rust. Growth and yield simulations and economic analyses indicate that insecticide treatment of loblolly pine for the combined control of the pine tip moth and the associated reduction in levels of fusiform rust infection may be potentially cost effective in stands managed for sawtimber, but not for pulpwood. South. J. Appl. For. 15(4):204-208.

scholarly journals Resistance of Pinus taeda families under artificial inoculations with diverse fusiform rust pathogen populations and comparison with field trials

2008 ◽  
Vol 38 (10) ◽  
pp. 2687-2696 ◽  
Author(s):  
Fikret Isik ◽  
Henry V. Amerson ◽  
Ross W. Whetten ◽  
Saul A. Garcia ◽  
Bailian Li ◽  
...  
Keyword(s):  
Pinus Taeda ◽  
Total Variation ◽  
Field Trials ◽  
Fusiform Rust ◽  
Artificial Inoculations ◽  
Single Field ◽  
Resistant Family ◽  
Pinus Taeda L ◽  
Pathogenic Variability ◽  
Pathogen Populations

Controlled inoculations with 10 bulk inocula of Cronartium quercuum (Berk) Miyabe ex Shirai f.sp. fusiforme were carried out on open-pollinated progeny of 25 fast-growing Pinus taeda L. parents. The parents had a range of breeding values for resistance to fusiform rust in progeny field trials. There were highly significant differences among the half-sib families in response to inoculations, and these differences were very reproducible; the half-sib family-mean heritability of resistance to controlled inoculation was 0.97. All of the families that were susceptible in the field were susceptible in controlled inoculations, and most (12 of 17) of the field-resistant families were resistant in response to controlled inoculations. Significant pathogenic variability was observed among the different bulk inocula, although this accounted for only 1.9% of the total variation. Genetic differences among families within field-resistant or field-susceptible groups accounted for 13.7% of the total variation. The family by inocula interaction was highly significant, but a single field-resistant family contributed 44% of the total family by inocula interaction variance, and two other field-resistant families also showed significant interactions.

Efficacy of Morning vs. Afternoon Applications of Triadimefon for Controlling Fusiform Rust

1984 ◽  
Vol 8 (4) ◽  
pp. 231-232
Author(s):  
Walter D. Kelley
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Fusiform Rust ◽  
Time Of Application ◽  
Pinus Taeda L

Abstract No differences were found between mornings (0800-1000 h) and afternoon (1600-1800 h) applications of triadimefon on loblolly pine (Pinus taeda L.) seedlings for control of fusiform rust in nursery beds. Also, rates of 4, 6, 8, and 12 oz/ac were equally effective in protecting seedlings. Results indicate that a lesser rate than the standard 8 oz/ac/application can be used and that time of application is not important.¹

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