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The effects of 2,4-D iso-octyl ester/ioxynil herbicide in the liquid and vapour phases on the growth of tomato (Lycopersicon esculentum Mill.) plants
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Bennet --- Department of Agriculture and Water Supply, Republic of South AfricaControlled-environment studies confirmed that tomato plants subjected to a range of treatments involving the herbicide 2,4-D iso-octyl ester/ioxynil applied in the vapour and liquid phases develop symptoms of phytotoxicity in proportion to the severity of the treatment. Plants which received... -
Phytotoxic response to foliar applications of molybdenum in tomato (Lycopersicon esculentum Mill.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Bennet --- Department of Agriculture and Water Supply, Republic of South AfricaFoliar applications of sodium molybdate solutions adversely affected the growth of tomato plants so that reductions in plant height and dry matter yield were associated with most treatments applied. Fifty per cent of the plants which were subjected to treatments... -
Effects of 2,4-D iso-octyl ester on the morphology, chlorophyll content and dry mass of lettuce and tomato seedlings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.R. Meinhardt --- Department of Agricultural Development, Republic of South Africa L.P. van Dyk --- Department of Agricultural Development, Republic of South AfricaTomato and lettuce seedlings were exposed to 1 or 3 mm of simulated rainfall containing the auxin-type herbicide 2,4-D iso-octyl ester. They were then evaluated weekly for damage according to symptoms and chlorophyll content. In addition, dry matter production was... -
Inheritance of flavour in six tomato (Lycopersicon esculentum) varieties
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: KarenA. Lunt --- Department of Genetics, Republic of South Africa C.Z. Roux --- Department of Genetics, Republic of South Africa I. Blokpoel --- , Republic of South Africa Mardè Booyse --- , Republic of South AfricaFlavour component differences between six tomato varieties and their F1, progenies were investigated. A diallel crossing system, excluding the reciprocal crosses was used. The F-1 and parent varieties were compared by carrying out a sensory evaluation and a chemical component... -
The effect of plant-growth regulators on the production of out-of-season greenhouse tomatoes (Lycopersicum esculentum)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. S.M. van Tonder --- , Republic of South-Africa N. J.J. Combrink --- , Republic of South-AfricaThe yield of greenhouse tomatoes produced in spring and midwinter is reduced by unfavourable environmental conditions involving low temperatures and low light intensities. This study has evaluated the role of various plant growth regulators including: synthetic cytokinin (CPPU) at 1ml.L−1,... -
The effect of boron levels in nutrient solutions on fruit production and quality of greenhouse tomatoes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.N. Smit --- Department of Agronomy, Republic of South Africa N. J.J. Combrink --- Department of Agronomy, Republic of South AfricaInsufficient fruit set of tomatoes owing to poor pollination in low cost greenhouses is a problem in South Africa, as bumblebee pollinators may not be imported. Since sub-optimum boron (B) levels may also contribute to fruit set problems, this aspect... -
Pollination and yield of winter-grown greenhouse tomatoes as affected by boron nutrition, cluster vibration and relative humidity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.N. Smit --- Department of Agronomy, Republic of South Africa N. J.J. Combrink --- Department of Agronomy, Republic of South AfricaProblems with reduced yields owing to poor pollination where tomatoes are grown out-of-season in low cost greenhouses, motivated this study. Greenhouse tomatoes were planted in acid washed river sand. Four balanced nutrient solutions, with different boron (B) levels (0.02; 0.16;... -
Oviposition site preferences by Helicoverpa armigera (Lepidoptera: Noctuidae): effect of season and density on distribution of eggs on plants
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E.S. Zitsanza --- Department of Crop Science, Zimbabwe D.P. Giga --- , Zimbabwe J.D. Knight --- Department of Environmental Science and Technology, UKIn an attempt to improve field sampling of the African bollworm, Helicoverpa armigera (Hübner), oviposition behaviour of the pest on tomato plants was investigated. From limited studies conducted in the past, variation in oviposition sites preferences by H. armigera is... -
Allelopathic influence of soils planted to Amaranthus cruentus L. on two tomato (Lycopersicon esculentum Mill.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Allemann --- , South Africa F. D.N. Denner --- , South AfricaAmaranthus cruentus L. is being evaluated as a potential high value niche market crop for small-scale farmers in South Africa. This is largely due to the demand for organically produced seed for the European health food market where it is... -
Phylogenetic studies of selected isolates of Potato virus Y (PVY) infecting vegetable crops in KwaZulu-Natal, Republic of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: JD Ibaba --- Discipline of Plant Pathology, School of Agricultural, Earth and Environmental Science, South Africa A Gubba --- Discipline of Plant Pathology, School of Agricultural, Earth and Environmental Science, South AfricaPhylogenetic relationships of Potato virus Y (PVY) isolates infecting vegetable crops in KwaZulu-Natal, Republic of South Africa, were investigated. A 1 067 bp amplicon covering part of the coat protein gene and the 3′ non-translated region (NTR) of three PVYO... -
Psychological Distress in Orphan, Vulnerable Children and Non-Vulnerable Children in High Prevalence HIV/AIDS Communities
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Bev Killian --- University of KwaZulu-Natal, Kevin Durrheim --- University of KwaZulu-Natal,The degree of psychological distress and access social support is investigated in children (n = 741) living in nine high prevalence HIV/AIDS communities. They comprised (i) vulnerable, maternally-orphaned (n = 319); (ii) vulnerable and not orphaned (n = 276); and... -
Spatial distribution of Nemesis lamna Risso 1826 (Copepoda: Siphonostomatoida: Eudactylinidae) on the gills of white sharks Carcharodon carcharias off KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Dippenaar R van Tonder S Wintner P ZunguThe selection of a specific site of attachment by a copepod parasite is determined by a set of mostly unknown factors. The spatial distribution of Nemesis lamna on the gill filaments of white sharks Carcharodon carcharias was investigated. The complete... -
Phylogenetic relationships and genetic diversity of Nemesis Risso, 1826 species found on different elasmobranch host species off the KwaZulu-Natal coast, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Mangena --- Department of Biodiversity, South Africa BP Jordaan --- Department of Biodiversity, South Africa SM Dippenaar --- Department of Biodiversity, South AfricaMembers of the order Siphonostomatoida (Copepoda) are generally poorly described from South African waters. Nemesis is one of 12 genera in the family Eudactylinidae and includes about nine species. In this study, we investigated whether there is any population structure... -
Impact of soil amendments and weather factors on bacterial wilt and yield of two tomato cultivars in Abeokuta, Nigeria
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Akinola R Popoola --- Department of Crop Protection, Nigeria Sikiru A Ganiyu --- Department of Crop Protection, Nigeria Oluwatoyin A Babalola --- Department of Soil Science and Land Management, Nigeria Emily I Ayo-John --- Department of Crop Protection, Nigeria Ayodele A Fajinmi --- Department of Crop Protection, Nigeria Iyabo A Kehinde --- Department of Biological Sciences, Nigeria Taiwo H Adegboye --- IFSERAR, NigeriaTomato bacterial wilt, caused by Ralstonia solanacearum, leads to tomato yield losses of up to 80% in south-western Nigeria. Soil amendments and weather conditions are important in the management of the disease. Field experiments were conducted at the Research Farm... -
A report of symbiotic Siphonostomatoida (Copepoda) infecting mobulids (Rajiformes: Mobulidae) off the KwaZulu-Natal coast, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Modjadji C. Lebepe --- Department of Biodiversity, South Africa Susan M. Dippenaar --- Department of Biodiversity, South AfricaThough South Africa is rich in aquatic species, little is known about the diversity and distribution of copepods that parasitize different hosts ranging from invertebrates to marine mammals. A total of 43 mobulids (34 Mobula kuhlii; two Mobula eregoodootenkee and... -
Reports of Kroyeria species collected from South African waters with notes on the host–parasite associations
Item type: Journal Article • Journal: African Zoology • Authors: Peter J Mokumo --- Department of Biodiversity, University of Limpopo, South Africa Susan M Dippenaar --- Department of Biodiversity, University of Limpopo, South AfricaThere are 21 species in the genus Kroyeria of which nine have been reported from hosts caught off South Africa. Host–parasite associations were reported for K. dispar, K. papillipes and K. sphyrnae. Kroyeria specimens were collected from the gill filaments... -
Biodiversity and studies of marine symbiotic siphonostomatoids off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SM Dippenaar --- Department of Biodiversity, South AfricaCurrent knowledge of the biodiversity of the symbiotic marine siphonostomatoids from South African waters (136 species) is sparse compared to that globally (1 388 species). The difference is especially apparent when taking into account the diversity of fish (more than... -
Farmers’ perspectives on factors limiting tomato production and yields in Kabete, Kiambu County, Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: G. N. Karuku --- Department of LARMAT, Nairobi J. W. Kimenju --- Department of Plant Science and Crop Protection, Nairobi H. Verplancke --- Department of Soil Management and Soil Care, BelgiumA survey was carried out in Kabete, Central Kenya to establish the limitations and constraints experienced by farmers growing tomatoes. A structured questionnaire was prepared and tested in the field before the actual survey was carried out. Fifty farmers were... -
Psychosocial management of depression in adolescent learners: Results and implications of a Nigerian study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Precious Chibuike Chukwuere --- School of Nursing Science, Faculty of Health Sciences, South Africa Abel Jacobus Pienaar --- Faculty of Nursing, Leepile Alfred Sehularo --- School of Nursing Science, Faculty of Health Sciences, South AfricaThis study explored the perceptions of adolescent learners, teachers, and parents on the psychosocial management of adolescent depression in a district of Lagos State, Nigeria. Data were collected from 24 participants (10 adolescent learners, 6 teachers, 2 principals, and 6... -
Promotion of local agri-food products through market knowledge: Consumption patterns and expectations of urban households towards local tomato purée in southern Benin
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Albertine M. Houessou --- , Benin Augustin K.N. Aoudji --- , Benin Rodrigue S. Kaki --- , Benin Smith A.R. Dossou --- , BeninUrban growth in sub-Saharan Africa is an opportunity for local agri-food businesses. However, local agri-food, including tomato purée in southern Benin, are struggling to emerge in urban markets. The main objective of this study was to identify avenues for increased... -
The first report of Naobranchia cygniformis Hesse, 1863 (Copepoda: Lernaeopodidae) off South Africa, with a redescription of the adult female
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SM Dippenaar --- , South Africa MM Sebone --- , South AfricaNaobranchia cygniformis Hesse, 1863 is one of 21 accepted species of the genus Naobranchia, which is distinguished from other genera in the family Lernaeopodidae by the possession of ribbon-like maxillae. The original description of N. cygniformis lacked detail concerning the... -
Occurrence of echinostomatoids (Platyhelminthes: Digenea) in Great Cormorant (Phalacrocorax carbo) and Grey Heron (Ardea cinerea): first insights into the DNA barcodes from Lake Victoria, Tanzania
Item type: Journal Article • Journal: African Zoology • Authors: Fred Chibwana --- , Tanzania Jestina Katandukila --- , TanzaniaMost migratory aquatic birds are regarded as reservoir hosts for many parasitic diseases, including digenetic trematodes that cause significant losses to farmed fish. However, in Tanzania, studies of birds focus more on their species diversity and patterns of speciation than... -
Response of tomato cultivars to irrigation management strategies employed by emerging farmers in the Greater Giyani Municipality
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tebogo J Lebea --- , South Africa Nebo Jovanovic --- , South Africa Mapotso Kena --- , South Africa Kwabena K Ayisi --- , South Africa Wisani G Mushadu --- , South AfricaIntensification of low-tech agricultural production is required in the Greater Giyani Municipality (Limpopo province, South Africa) to respond to changing climatic conditions, water scarcity and increased food demand of the local market. Two years of field experiments were conducted on... -
Impact of postharvest handling technologies on income of tomato (Solanum Lycopersicum L.) smallholder farmers in Mvomero, Morogoro, Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Robert Geofrey --- Mzumbe University, Tanzania Eliaza Mkuna --- Mzumbe University, Tanzania Nyamsabhi M. Nyamwero --- Mzumbe University, Tanzania Kulwa Mang’ana --- Nelson Mandela African Institute of Science and Technology (NM-AIST), TanzaniaThis study investigates how smallholder tomato farmers in Mvomero District, Tanzania, utilize postharvest handling technologies (PHTs) and analyzes the factors influencing their adoption. We also assess the impact of PHTs on farmer income. Using a cross-sectional survey of 201 farmers,...