n Southern African Forestry Journal - Survival and growth of at two years in response to harvest residue and pest management, in Mpumalanga, South Africa : scientific paper

Volume 2004, Issue 200
  • ISSN : 0038-2167



Previous research has indicated that the presence of harvesting residues, post-planting temperature and rainfall, and insect pests and diseases, are among the main causes of mortality during re-establishment of <I>Pinus patula&lt;/I&gt; stands. The main objectives of this work were to confirm previous observations on the effects of these factors on initial survival and growth of <I>P. patula&lt;/I&gt; seedlings. Three harvest residue management treatments (burning, harvesting residues left <I>in situ&lt;/I&gt; or removed) and four pest management treatments applied at planting (fungicide, insecticide, fungicide and insecticide, and a control, where no pesticides were used) were tested in combination with each other. For the first two years after planting, there was a significant effect of harvest residue and pest management on survival. At two years, survival in the burned treatment was 59 %, possibly due to the presence of <I>Rhizina undulata</I>. Where the harvest residues were not burned, the survival was 88 %. Application of a fungicide and insecticide at planting improved survival in all harvest residue treatments, especially the burned treatment. Tree growth was the best where both a fungicide and insecticide had been applied at planting, followed by the individual application of either a fungicide or insecticide, with the poorest growth occurring in the control treatment.

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