Robust management decision-making requires constant improvements to the understanding of the short- and longer-term impacts of re-establishment practices on tree performance. There is a lack of information regarding the impact of fertilisation and vegetation management on the longer-term (mature stand or rotation-end) yield of pines grown for pulpwood in South Africa.
Two trials were implemented in the KwaZulu-Natal Midlands in October 2016 (at Ingwe and Balgowan plantations), to test the efficacy of eight different insecticides (synthetic and organic) for the management of foliar insect pests. The Ingwe trial was planted with Eucalyptus dunnii and the Balgowan trial was planted with Eucalyptus badjensis.
Corymbia henryi has shown potential for good growth and pest and pathogen tolerance in the sub-tropical and warm temperate forestry areas in South Africa. To further expand the genetic base of this species, two trials comprising six provenances from Australia were established on the Zululand Coastal Plains in 2010. Four-year diameter at breast height measurements were performed in the trials, survival and basal area per hectare calculated, and Type B correlations estimated to determine genotype x environment interaction.
Black wattle (Acacia mearnsii) is a leading commercially grown forestry tree species in South Africa. However, it is still considered an exotic invader species and is listed as a Category 2 invasive species. This invasive status adds unwanted pressure to the industry, making future afforestation to black wattle difficult, particularly for small growers. The production of a sterile or seedless variety of black wattle would be a solution to help reduce the contribution of seed to the existing seedbank and simultaneously remove the invasive status of black wattle.
The following document is a summary of publications produced by the ICFR including bulletins, technical notes, papers and conference proceedings during 2016.
Abstracts are presented in the five publication categories: Technical Reports (Bulletins and Technical Notes), Peer-reviewed Papers, Other Publications, Lectures and Courses, and Conference and Symposia, in alphabetical order according to senior author surname, and are also indexed according to author.
Eucalyptus badjensis was identified in ICFR site-species trials as one of the few species with commercial potential in the temperate summer rainfall regions of South Africa. This is because the species has an optimum Mean Annual Temperature (MAT) range between 14.5 °C and 17 °C and is considered as cold tolerant as E. nitens and moderately snow hardy. Eucalyptus badjensis is only slightly less frost hardy than E. macarthurii and E. benthamii, and is as hardy as E. nitens.
The following is a summary of publications produced by the Institute for Commercial Forestry Research (ICFR) including bulletins, technical notes, papers and conference proceedings during 2015.
Abstracts are presented in the five publication categories; Technical Reports (Bulletins and Technical Notes), Peer-review Papers, Other Publications, Lectures, Seminars and Courses, and Conferences and Symposia, in alphabetical order according to senior author surname, and are also indexed according to author.
Acacia mearnsii de Wild (black wattle) is an important plantation species for bark extract production and woodchip exports in South Africa. The total area planted to black wattle in South Africa is currently 110 000 ha of which about 29% is located in areas prone to radiation frost in south-eastern Mpumalanga and northern KwaZulu-Natal. In the rest of the wattle-growing areas, including the KwaZulu-Natal Midlands, frost damage occurs in low-lying areas (frost hollows/pockets or valley bottoms).
The pressure on reducing the cost of delivered wood in the South African commercial forestry industry has resulted in changes to the way in which many silvicultural operations are performed. These changes often include the re-prioritisation of various aspects of silviculture, the reduction in the number of operations, and the increased efficiency of operations, which may include a level of mechanisation.