Articles by Author: Ws Dvorak

Search results for Ws Dvorak

We found 12 results for you
  1. Early Performance of CAMCORE Introductions of <em>Pinus patula</em> in Brazil, Colombia and South Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    Seeds were collected from 13 provenances and 282 mother trees of Pinus patula Schiede & Deppe across a 900 km transect from Tamaulipas to Oaxaca, Mexico by the CAMCORE Cooperative, North Carolina State University, USA. Thirty-three provenance/progeny tests were established...
  2. Realised and Predicted Genetic Gain in the <em>Pinus patula</em> Breeding Program of Smurfit Carton de Colombia

    Item type: Journal Article • Journal: South African Forestry Journal
    Narrow sense individual (h2), family (h2 f) and within family (h2 w) heritability values for Pinus patula from three CAMCORE trials in Colombia were calculated for height, diameter at breast height and volume per tree at eight years of age...
  3. Positioning tree improvement programs to utilize advances in new technologies

    Positioning tree improvement programs to utilize advances in new technologies

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Forestry will be characterized by many changes in early part of the 21st century. Forest industries will continue to merge in order to capture greater percentages ofthe woodand paper market. For example, iflnternational Paper Company acquires Champion International Corporation the...
  4. Growth and provenance variation of <em>Pinus caribaea</em> var. <em>hondurensis</em> as an exotic species

    Growth and provenance variation of <em>Pinus caribaea</em> var. <em>hondurensis</em> as an exotic species

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    CAMCORE has visited 33 populations of Pinus caribaea var. hondurensis in Belize, Guatemala, Honduras, El Salvador, Nicaragua, and Quintana Roo, Mexico. Seed collections have been made in 29 provenances from 1,325 mother trees. A total of 21 provenances and sources...
  5. Collection and conservation of <em>Pinus maximartinezii</em>, a rare and endangered pine species

    Collection and conservation of <em>Pinus maximartinezii</em>, a rare and endangered pine species

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Pinus maximartinezii Rzedowski is a rare pinyon pine known to occur naturally on only one site on the Cerro de Pinones, in the Sierra de Morones, near the town ofJuchipila, in southern Zacatecas, Mexico(21° 21' N, 103° 13' W). P...
  6. Quantifying the geographic range of <em>Pinus patula</em> var <em>longipedunculata</em> in Southern Mexico using morphologic and RAPD marker data

    Quantifying the geographic range of <em>Pinus patula</em> var <em>longipedunculata</em> in Southern Mexico using morphologic and RAPD marker data

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Pinus patula var. longipedunculata occurs in southern Mexico, but the extent of its geographic range is poorly defined. Trees from some populations are morphologically similar to P. tecunumanii, which adds to the confusion over the variety's geographic range. Recent field...
  7. Genotype by environment interaction for volume growth at 6 years of age in a series of five <em>Pinus patula</em> progeny trials in southern Africa

    Genotype by environment interaction for volume growth at 6 years of age in a series of five <em>Pinus patula</em> progeny trials in southern Africa

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Genotype x environment interaction was investigated in a series of 5 Pinus patula progeny trials planted by the Institute for Commercial Forestry Research in southern Africa. The trials were established from Mpumalanga to the North-eastern Cape in a balanced 7x7...
  8. The strategic importance of applied tree conservation programs to the forest industry in South Africa

    The strategic importance of applied tree conservation programs to the forest industry in South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Because of anticipated adverse climatic change and resulting increases in disease and insect attacks in forest plantations in the future, forest industries must maintain broad genetic bases for adaptability and pest resistance. Since the early 1980s, the South African forest...
  9. Comparisons between laboratory and field results of frost tolerance of pines from the southern USA and Mesoamerica planted as exotics

    Comparisons between laboratory and field results of frost tolerance of pines from the southern USA and Mesoamerica planted as exotics

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    An artificial freezing study was conducted with 14 pine species and varieties from Mexico and Central America, and the southern and western USA. The pines chosen represented major commercial plantation species in the Southern Hemisphere such as Pinus caribaea var...
  10. Growth potential and genetic parameters of four Mesoamerican pines planted in the Southern Hemisphere

    Growth potential and genetic parameters of four Mesoamerican pines planted in the Southern Hemisphere

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Summary results are reported from a total of 319 provenance/progeny tests of Pinus tecunumanii, P. maximinoi, P. patula and P. greggii that were established on sites in Brazil, Colombia and South Africa. Tests were measured for the growth traits height,...