Showing papers in "South African forestry journal in 1968"
TL;DR: Studies of the rates of mycelial growth and spore germination at different temperatures as well as the sensitivity to fungicides of Diplodia pinea were undertaken to investigate the possibility of controlling its invasion of haildamaged pine trees by aerial spraying or dusting with fungicides.
Abstract: SUMMARY Studies of the rates of mycelial growth and spore germination at different temperatures as well as the sensitivity to fungicides of Diplodia pinea were undertaken to investigate the possibility of controlling its invasion of haildamaged pine trees by aerial spraying or dusting with fungicides. Pycnospores were found to be capable of rapid germination and mycelium of rapid growth over a wide range of temperatures. Maneb and cycloheximide were found to inhibit mycelial growth on potato-dextrose agar at one-eighth of the concentration, or less, of copper-based fungicides. Weather conditions and other considerations may, however, result in postponement of application of the fungicides so that cycloheximide may prove to be the only fungicide of any practical value. Further investigation of the use of cycloheximide against D. pinea is, however, required.
11 citations
TL;DR: The necessity is stressed for immediate specialist investigation into effecting permanent control of this economically important forest pest, preferably by biological means, in Rhodesia.
Abstract: SUMMARY Defoliation of well-stocked, 10–12-year-old P. parula, and younger E. saligna/grandis and E. cloeziana standsby the larval stages of a geometrid moth Buzura edwardsi Walker, recently indicates that this is a potentially important forest pest in the Melsetter district, one of the major areas of pine and eucalypt afforestation in Rhodesia. Field observations of the habitsand life cycle of the pest and the damage it causes are recorded, as well as its biological control which, in normal seasons, appears to be adequate in keeping infestation at tolerable levels. However, the necessity is stressed for immediate specialist investigation into effecting permanent control of this economically important forest pest, preferably by biological means.
6 citations
TL;DR: In this paper, the authors discuss the problem of planting trees in polythene bags, and propose a method to solve it by planting trees on the ground instead of in bags.
Abstract: (1968). Planting of trees in polythene bags. South African Forestry Journal: Vol. 67, No. 1, pp. 28-29.
3 citations
3 citations
1 citations