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.

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

2008 ◽  
Vol 38 (12) ◽  
pp. 3151-3151
Author(s):  
Fikret Isik ◽  
Henry V. Amerson ◽  
Ross W. Whetten ◽  
Saul A. Garcia ◽  
Bailian Li ◽  
...  
Keyword(s):  
Pinus Taeda ◽  
Field Trials ◽  
Fusiform Rust ◽  
Rust Pathogen ◽  
Artificial Inoculations ◽  
Pathogen Populations

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.

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.

Tolerance of Loblolly Pines to Fusiform Rust

1995 ◽  
Vol 19 (2) ◽  
pp. 60-64 ◽  
Author(s):  
Charles H. Walkinshaw ◽  
James P. Barnett
Keyword(s):  
Pinus Taeda ◽  
Rust Fungus ◽  
The Other ◽  
Diameter Growth ◽  
Mature Trees ◽  
Fusiform Rust ◽  
Infected Tree ◽  
Loblolly Pines ◽  
Pinus Taeda L ◽  
Natchez Trace Parkway

Abstract Loblolly pines (Pinus taeda L.) that were 8 to 17 yr old tolerated one to three fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shiraif sp. fusiforme) galls in their stems. Families with four or more galls in their stems lost 25% or more of the trees by age 17. In living trees with less than four stem galls, diameter growth was comparable to that of trees with no galls. Tolerance was indicated by the ability of loblolly pines to maintain the rust fungus in stems that had dbh's similarto asymptomatic trees on the same site. In plantations, the number of galls in the stem was generally one to two per infected tree. This was also true for mature trees (12 to 38 in. dbh) along the Natchez Trace Parkway. These trees have been infected with fusiform rust for nearly 100 yr. On the other hand, the presence of four or more stem galls seems to be a reliable indicator of mortality rather than tolerance. South. J. Applied For. 19 (2): 60-64.

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 Fusiform Rust Incidence in Loblolly and Slash Pine Plantations in East Texas

1991 ◽  
Vol 15 (2) ◽  
pp. 79-84 ◽  
Author(s):  
Alexandros A. Arabatzis ◽  
Timothy G. Gregoire ◽  
J. David Lenhart
Keyword(s):  
Pinus Taeda ◽  
Regression Models ◽  
Multinomial Logistic Regression ◽  
Slash Pine ◽  
East Texas ◽  
Fusiform Rust ◽  
Logistic Regression Models ◽  
Free Tree ◽  
Pinus Taeda L ◽  
Over Time

Abstract A method to predict the incidence of fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme) in unthinned loblolly (Pinus taeda L.) and slash pine (Pinus elliotti Englem.) plantations located on non-old-fields in East Texas is presented. In addition, procedures are described to estimate changes in rust incidence over time as: 1. A rust-free tree remains rust free, develops stem or branch galls, or dies. 2. A tree with branch galls remains with branch galls only, develops stem galls, or dies. 3. A tree with stem galls remains with stem galls, or dies. Multinomial logistic regression models utilizing basic plantation parameters as predictors were fit to estimate current rust incidence and, then, the change in rust condition over time. South. J. Appl. For. 15(2):79-84.

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

scholarly journals Estimating Crown Height for Unthinned Planted Pines in East Texas

1997 ◽  
Vol 21 (3) ◽  
pp. 130-133
Author(s):  
Young-Jin Lee ◽  
J. David Lenhart
Keyword(s):  
Pinus Taeda ◽  
Basal Area ◽  
Pinus Elliottii ◽  
Average Height ◽  
East Texas ◽  
Crown Height ◽  
Fusiform Rust ◽  
Pine Trees ◽  
Pinus Taeda L ◽  
Lower Stem

Abstract Stand-level models were derived to predict crown height or the distance from ground to the first live branch of unthinned planted loblolly (Pinus taeda L.) and slash (Pinus elliottii Engelm.) pine trees in East Texas. Average height of the tallest trees was the principal predictor in the models. In addition, the influence of number of planted trees per acre, nonplanted basal area and fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme) was considered. The models quantify the plantation ages when the butt log and successive lower stem logs are clear of live branches. This information may assist with merchandising the planted pines. South. J. Appl. For. 21(3):130-133.

Performance of Unthinned Loblolly and Slash Pine Plantations on Three Sites in South Carolina

1977 ◽  
Vol 1 (4) ◽  
pp. 8-10
Author(s):  
D. H. Van Lear ◽  
N. B. Goebel ◽  
J. G. Williams
Keyword(s):  
South Carolina ◽  
Pinus Taeda ◽  
Loblolly Pine ◽  
Slash Pine ◽  
The Other ◽  
Fusiform Rust ◽  
Growth And Survival ◽  
Growing Seasons ◽  
Pinus Taeda L ◽  
Region Growth

Abstract The performance of adjacent unthinned plantations of loblolly (Pinus taeda L.) and slash pine (P. elliottii Engelm.) on three sites in South Carolina was evaluated after 16 growing seasons. Sites ranged from a noneroded Piedmont soil to an excessively drained sandy soil of the Sandhills physiographic region. Growth and survival varied widely among sites, with greatest productivity occurring in the Piedmont and the lowest in the Congaree Sandhills. Despite the droughty nature of the latter site, survival after 16 growing seasons was over 80 percent for both species. On a volume basis, loblolly pine outperformed slash pine at the upper Pidemont and Aiken Plateau sites, while slash pine was superior on the dry Sandhills site. Incidence of fusiform rust was much higher for both species at the Aiken Plateau than at the other sites.

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