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Morphogenesis of Malus domestica cv. Starking flower buds
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- ,Differentiation of reproductive buds of the Starking apple (Malus domestica) was studied by scanning electron microscopy. Differentiation of reproductive structures was initiated during the first week of January when the shoot apex flattened. In terminal flower primordia, sepal primordia were... -
Effect of the previous crop on cortical cell number of Malus domestica cv. Starking Delicious apple flower primordia, flowers and fruit
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- ,The effect of the crop of the previous season on cell size of the cortical region of flower primordia, flowers and fruit size in Starking Delicious apples was investigated. Cell number was monitored from the onset of differentiation of the... -
Die invloed van nat grondtoestande op die vrugkwaliteit van appels
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.F. Lourens --- ,Vrugontledings op appels van bome op gedeeltelik versuipte gronde gedurende die vruggroei-periode het hoër Na- en B- en laer N- en Mg-peile getoon as appels van bome op droër gronde. Die vrugte van nat persele was fermer en het hoër... -
The effect of some chemical agents on thinning of Golden Delicious and Granny Smith apples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.F. Lourens --- , Republic of South AfricaThinning trials were carried out with various chemical compounds on Golden Delicious and Granny Smith apple trees over a period of three years in the Elgin area in the western Cape. The scorching agents dinoseb (2-sec-butyl-4,-6-dinitrophenol) and paraquat (1,1'-dimethyl-4,4′-bipyridinium ion)... -
Effect of time of hand-thinning on apple fruit size
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe effect of time of hand-thinning on fruit size of Starking, Starkrimson and Starkspur Golden Delicious was studied during two consecutive seasons. In the first season trees were thinned at weekly or fortnightly intervals, commencing at full bloom until eight... -
Effect of temperature during the first 42 days following full bloom on apple fruit growth and size at harvest
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe relationship between temperature prevailing during the 42-day period following full bloom (42 DFFB) and fruit size at harvest of four apple cultivars was studied for two seasons. Lower temperatures during the first season resulted in smaller fruit whereas higher... -
Proposed regression model for calculating optimum crop levels of apple trees
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe value per ton of Golden Delicious, Granny Smith, Starking and Starkrimson fruit was calculated by assigning values per carton to each of six size groups of fruit harvested from individual trees in experimental orchards during the four seasons 1978/79... -
Alternative rest-breaking agents to DNOC/oil for apples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.S. North --- , Republic of South AfricaRest-breaking agents less toxic than the commercially-used DNOC/winter-oil and less expensive than hydrogen cyana- mide were tested on Golden Delicious in a high density planting in a region of warm winters. Some combinations of mineral oil and cyanamide were as... -
Cumulative effect of time of hand-thinning on fruit size of Golden Delicious and Granny Smith apples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe cumulative effect of time of hand-thinning on fruit size of Golden Delicious and Granny Smith apple trees was studied during seven consecutive seasons for Golden Delicious and four consecutive seasons for Granny Smith. Trees were thinned to single flowers... -
Effect of different day and night temperatures on the diurnal growth rate of terminal and lateral fruits in Golden Delicious apple
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South Africa DeV. Cloete --- , Republic of South AfricaThe diurnal growth rate of terminal and lateral fruitlets in the same cluster was studied in Golden Delicious under varying night and day temperature conditions In growth chambers as well as in the open. Terminal and lateral fruitlets had a... -
Comparison of procedures to evaluate the pathogenicity of Ceratocystisfimbriata sensu lato isolates from Eucalyptus in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M van Wyk --- Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa RN Heath --- Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa M Tarigan --- Department of Microbiology and Plant Pathology, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa M Vermeulen --- Department of Microbiology and Plant Pathology, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa MJ Wingfield --- Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South AfricaCeratocystis fimbriata sensu lato (s.l.) is an important pathogen of Eucalyptus. Pathogenicity of isolates has typically been evaluated by inoculating seedlings under greenhouse conditions. It is, however, not clear how accurately this reflects pathogenicity under field conditions. In this study,... -
Antioxidant content and phytochemical properties of apple ‘Granny Smith’ at different harvest times
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Asanda Mditshwa --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Department of Horticultural Sciences, Faculty of AgriSciences, South Africa Filicity Vries --- Agricultural Research Council Infruitec-Nietvoorbij, South Africa Kobus van der Merwe --- Agricultural Research Council Infruitec-Nietvoorbij, South Africa Elke Crouch --- Department of Horticultural Sciences, Faculty of AgriSciences, South Africa Umezuruike Linus Opara --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Department of Horticultural Sciences, Faculty of AgriSciences, South AfricaUnderstanding the biochemical composition of fruit to be stored could be used as a tool for planning postharvest management to maintain quality and reduce losses of fresh fruit. This study evaluated the effects of harvesting fruit seven days before (H1)...