PubAg

Main content area

You searched for: Journal Southern forests Remove constraint Journal: Southern forests Publication Year 2014 Remove constraint Publication Year: 2014 Subject South Africa Remove constraint Subject: South Africa
Start Over

Search

11  Search Results

1 - 11 of 11
Number of results to display per page

Search Results

1. Effects of plantation residue management on the community structure of wattle regeneration invertebrate pests in South Africa

Author:
Govender, Prem
Source:
Southern forests 2014 v.76 no.4 pp. 229-236
ISSN:
2070-2639
Subject:
Acacia mearnsii; Diplopoda; Elateridae; Formicidae; Isoptera; Nematoda; Orthoptera; Quercus; community structure; cutworms; death; fallow; forests; grasshoppers; growing season; guidelines; mortality; multivariate analysis; pesticide application; plantations; planting; seedlings; silviculture; soil invertebrates; spatial distribution; South Africa
Abstract:
... There is a limited availability of land for the expansion of South African black wattle plantations. One way to increase productivity is to ensure the survival of seedlings during regeneration, thereby increasing the stocking of compartments. Soil invertebrate pests constitute one of the important causes of seedling mortality. The effect of different plantation residue management practices on the ...
DOI:
10.2989/20702620.2014.957596

2. Association of the pitch canker pathogen Fusarium circinatum with grass hosts in commercial pine production areas of South Africa

Author:
Swett, Cassandra L; Porter, Bernice; Fourie, Gerda; Steenkamp, Emma T; Gordon, Thomas R; Wingfield, Michael J
Source:
Southern forests 2014 v.76 no.3 pp. 161-166
ISSN:
2070-2639
Subject:
Briza maxima; DNA; Ehrharta; Fusarium circinatum; Pinus; Pseudotsuga menziesii; disease occurrence; endophytes; forests; fungi; grasses; host range; hosts; inoculum; nucleotide sequences; pathogens; plantations; sanitation; virulence; California; South Africa
Abstract:
... The pitch canker pathogen, Fusarium circinatum , has major impacts on production in pine nurseries and plantations in South Africa. Thus far, efforts to reduce local spread have focused on rouging of infected pines and sanitation to eliminate local sources of inoculum. Although the host range of F. circinatum was thought to be limited to pines and Douglas-fir, recent studies in California indicate ...
DOI:
10.2989/20702620.2014.916087

3. Comparison of the tolerance of Pinus patula seedlings and established trees to infection by Fusarium circinatum

Author:
Mitchell, R Glen; Wingfield, Michael J; Steenkamp, Emma T; Roux, Jolanda; Verryn, Steven; Coutinho, Teresa A
Source:
Southern forests 2014 v.76 no.3 pp. 151-159
ISSN:
2070-2639
Subject:
Fusarium circinatum; Pinus patula; clones; foresters; forests; greenhouse experimentation; greenhouses; open pollination; pathogens; screening; seedlings; seeds; trees; South Africa
Abstract:
... Since the first appearance of Fusarium circinatum in South Africa in 1990, foresters have been challenged with poor field survival of Pinus patula seedlings at establishment. One of the best long-term solutions is to improve the genetic tolerance of P. patula to infection by the pathogen. Currently, large numbers of families are routinely screened for their tolerance to F. circinatum by infecting ...
DOI:
10.2989/20702620.2014.899061

4. Effect on nursery and field performance of Pinus patula seedlings after inoculation with Fusarium circinatum

Author:
Jones, Nicoletta B; Ford, Craig M; Light, Marnie E; Nadel, Ryan L; Greyling, Izette; Fourie, Gerda; Wingfield, Michael J; Morris, Andrew R
Source:
Southern forests 2014 v.76 no.3 pp. 125-136
ISSN:
2070-2639
Subject:
Fusarium circinatum; Pinus patula; forestry; forests; fungi; inoculum; mortality; pathogens; plant establishment; seedlings; water stress; South Africa
Abstract:
... Fusarium circinatum is an important fungal pathogen of Pinus species. In South Africa, it is the most significant pathogen of Pinus patula seedlings in forestry nurseries where it presents a substantial constraint to productivity and can continue to cause mortality in-field for up to two years after establishment. This study describes the results from two trials where P. patula seedlings were inoc ...
DOI:
10.2989/20702620.2014.916503

5. Genetic parameters for Fusarium circinatum tolerance within openpollinated families of Pinus patula tested at screening facilities in South Africa and the USA

Author:
Nel, Andre; Hodge, Gary R; Mongwaketsi, Kgosi E; Kanzler, Arnulf
Source:
Southern forests 2014 v.76 no.3 pp. 145-150
ISSN:
2070-2639
Subject:
Fusarium circinatum; Pinus patula; breeding; crops; forests; fungi; genetic variation; greenhouses; hygiene; mortality; open pollination; screening; seedlings; trees; South Africa; United States
Abstract:
... The pine pitch canker fungus, Fusarium circinatum , has caused large-scale mortality of Pinus patula Schiede & Deppe ex Schltdl. & Cham. crops in South African nurseries. This disease is now managed with strict hygiene practices and mortality in commercial nurseries has been drastically reduced. During the last 10 years, however, the disease started to manifest in the field, impacting on post-plan ...
DOI:
10.2989/20702620.2014.916500

6. Pinus patula and pine hybrid hedge productivity in South Africa: a comparison between two vegetative propagation systems exposed to natural infection by Fusarium circinatum

Author:
Ford, Craig M; Jones, Nicoletta B; Chirwa, Paxie WC
Source:
Southern forests 2014 v.76 no.3 pp. 167-175
ISSN:
2070-2639
Subject:
Fusarium circinatum; Pinus patula; Pinus tecunumanii; bags; bark; forests; growing media; hybrids; hydroponics; mortality; pathogens; sand; vegetative propagation; South Africa
Abstract:
... In response to the Fusarium circinatum pine pathogen threat in southern Africa, research has been conducted on the development of F. circinatum- tolerant P. patula and P. patula hybrids. The objective of this study was to investigate the propagation potential of these taxa in two vegetative propagation systems, hydroponic sand beds and polythene bags with composted pine bark growing medium. Signif ...
DOI:
10.2989/20702620.2014.916501

7. A comparison of productive and non-productive green water-use efficiency of Podocarpus henkelii and Pinus patula in the KwaZulu-Natal Midlands

Author:
Bulcock, Hartley H; Gush, Mark B; Jewitt, Graham PW
Source:
Southern forests 2014 v.76 no.2 pp. 75-84
ISSN:
2070-2639
Subject:
Pinus patula; Podocarpus; afforestation; canopy; evaporation; forest plantations; forests; fynbos; grasslands; introduced species; models; planning; planting; soil; transpiration; trees; water management; water use efficiency; South Africa
Abstract:
... A number of studies undertaken in South Africa to quantify the green water-use (total evaporation) of introduced commercial forestry species have shown conclusively that green water-use from commercial forest plantations is substantially higher than from the original grasslands or fynbos that were replaced by afforestation. Green water can be categorised into productive (transpiration) and non-pro ...
DOI:
10.2989/20702620.2014.915451

8. Modelling of wander ratios, travel speeds and productivity of cable and grapple skidders in softwood sawtimber operations in South Africa

Author:
Ackerman, Pierre; Pulkki, Reino; Gleasure, Elizabeth
Source:
Southern forests 2014 v.76 no.2 pp. 101-110
ISSN:
2070-2639
Subject:
data collection; forests; harvesting; humans; models; planning; prediction; regression analysis; sawlogs; skidders; softwood; supply chain; trees; South Africa
Abstract:
... The objective of this study was to develop predictive models for cable and grapple skidder wander ratios, travel speeds (loaded and unloaded), and productivity in softwood roundwood sawtimber harvesting operations. For field data collection, the study utilised on-board computing systems supported by manual time study. Four-hundred and twenty-seven extraction cycles over varying terrain and tree si ...
DOI:
10.2989/20702620.2014.917355

9. Testing pelargonic acid and pyraflufen-ethyl with glyphosate as alternatives to paraquat dichloride for the preparation of fire-break tracer lines at Underberg, South Africa

Author:
Little, Keith M; Nadel, Ryan
Source:
Southern forests 2014 v.76 no.2 pp. 67-73
ISSN:
2070-2639
Subject:
application timing; fire break; forests; glyphosate; paraquat; pelargonic acid; risk; screening; spraying; summer; vegetation cover; South Africa
Abstract:
... Over the past 31-year period, about 18 700 ha annum ⁻¹ of planted forests in South Africa have been lost through fire. In forested areas where the risk of fire entering compartments is always high, fire-break tracer lines are prepared by spraying with a suitable herbicide such that the adjacent vegetation is still 'green' when these tracer lines can be burned. Once the vegetation between these tra ...
DOI:
10.2989/20702620.2014.893683

10. The socioeconomic impact of the phasing out of plantations in the Western and Southern Cape regions of South Africa

Author:
de Beer, M Carien; Ham, Cori; Längin, Dirk W; Theron, Francois
Source:
Southern forests 2014 v.76 no.1 pp. 57-64
ISSN:
2070-2639
Subject:
business enterprises; community service; employment opportunities; forestry; forests; plantations; stakeholders; supply chain; unemployment; South Africa
Abstract:
... This study investigates the possible socioeconomic impact of the phasing out of nearly 22 500 ha of plantations within the Southern and Western Cape regions of South Africa as a result of a decision made by government in 2000. Data was collected in 2007 from three plantations (one near Grabouw in the Western Cape, and two near George in the Southern Cape) managed by Mountain to Ocean Forestry (Pty ...
DOI:
10.2989/20702620.2013.870386

11. Variation in strength, stiffness and related wood properties in young South African-grown Pinus patula

Author:
Wessels, C Brand; Malan, Francois S; Nel, Daan G; Rypstra, Tim
Source:
Southern forests 2014 v.76 no.1 pp. 37-46
ISSN:
2070-2639
Subject:
Pinus patula; forests; modulus of elasticity; modulus of rupture; pith; prediction; sawlogs; softwood; trees; wood properties; South Africa
Abstract:
... The objective of this study was to examine the variation in and intercorrelation among wood properties determining the suitability of 16- to 20-year-old South African-grown Pinus patula trees for structural timber. A total of 1 112 sawn boards from 340 logs, 170 trees and 17 different compartments were examined. Sawlogs were taken from two height levels from each tree. The mean modulus of elastici ...
DOI:
10.2989/20702620.2013.870406