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Differential susceptibility of commercial zucchini cultivars to viruses of cucurbits
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K.R. Cradock --- , Republic of South Africa J.V. da Graça --- , Republic of South Africa M.D. Laing --- , Republic of South AfricaA study to assess the effectiveness of some zucchini [Cucurbita pepo (L.)] cultivars in limiting the effects of virus disease in zucchini crops was conducted at Bayne's Drift, KwaZulu-Natal. The severity of disease was assessed using a visual rating scale... -
Breeding phenology and moult of the endemic Bannerman's Weaver Ploceus bannermani
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Yahkat Barshep --- AP Leventis Ornithological Research Institute, Nigeria Shiiwua A Manu --- AP Leventis Ornithological Research Institute, NigeriaThe breeding phenology and moult cycle of the vulnerable and range-restricted Bannerman's Weaver Ploceus bannermani was studied on the Obudu Plateau in the eastern region of Nigeria. The peak breeding season was between August and October; a major cause of... -
Use of a chimeric transgene construct to confer broad resistance in zucchini (Cucurbita pepo L.) plants against cucurbit-infecting potyviruses occurring in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacques D Ibaba --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, College of Agriculture and Environmental Sciences, South Africa Benice J Sivparsad --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, College of Agriculture and Environmental Sciences, South Africa Mark D Laing --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, College of Agriculture and Environmental Sciences, South Africa Augustine Gubba --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, College of Agriculture and Environmental Sciences, South AfricaThe frequent identification of cucurbit-infecting viruses across the province of KwaZulu-Natal (KZN) in South Africa necessitates developing effective methods of controlling these diseases. Putative transgenic baby marrow (Cucurbita pepo L.) plants resistant to Zucchini yellow mosaic virus (ZYMV), Moroccan watermelon... -
A demonstration of the value of recapture data for informing moult phenology models for avian species with imperfect moult data
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Philipp H Boersch-Supan --- , United Kingdom Alan Tristram Kenneth Lee --- University of Cape Town, South Africa Hans-Dieter Oschadleus --- University of KwaZulu-Natal, South AfricaThe Underhill–Zucchini model has revolutionised the study of moult in the context of birds’ annual cycles, but, as for all statistical models, inferences are vulnerable to violations of model assumptions. In particular, the standard Underhill–Zucchini models for moult phenology are... -
Primary moult in the annual cycle of adult African Oystercatchers Haematopus moquini
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Taylyn C Bate --- University of Cape Town, South Africa Peter G Ryan --- University of Cape Town, South Africa Les G Underhill --- University of Cape Town, South AfricaAfrican Oystercatchers Haematopus moquini are sedentary, intertidal foraging birds, range-restricted to Namibia and South Africa. Their annual cycle has two components: breeding and moult. The Underhill–Zucchini model estimated a primary moult duration of 154 days, and mean start and completion... -
Primary moult of adult Laughing Doves Spilopelia senegalensis: introduction of the relative duration index and a comparison of moult indices
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Tanya Scott --- University of Cape Town, South Africa Les G Underhill --- University of Cape Town, South Africa George D Underhill --- University of Cape Town, South AfricaA new moult index, the relative duration index (RDI), was developed to quantify progress through moult using the Underhill–Zucchini model of primary avian moult, with the Laughing Dove Spilopelia senegalensis as a case study. The RDI weights individual primaries in... -
The primary moult of adult Red-headed Finches Amadina erythrocephala
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: T Scott --- University of Cape Town, South Africa JMH Raijmakers --- , South Africa LG Underhill --- University of Cape Town, South AfricaLittle is known about the biology of the Red-headed Finch Amadina erythrocephala. This study investigates its primary moult, the first aspect of its life history to be looked at in depth. Additionally, we used a modified Cook’s distance algorithm to... -
Influence of groups of points on estimates of the parameters of moult
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Les G Underhill --- University of Cape Town, South Africa Tanya Scott --- University of Cape Town, South AfricaThe Underhill–Zucchini model of avian moult is a statistical simplification for the analysis of primary moult, a complex biological system in birds. As with all such models, conclusions can be biased if a subset of the data used to fit... -
Isolation and in vitro screening of potential biocontrol agents against powdery mildew of zucchini caused by Podosphaera xanthii
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.B. Tesfagiorgis --- School of Agricultural Sciences and Agribusiness, Discipline of Plant Pathology, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa M.D. Laing --- School of Agricultural Sciences and Agribusiness, Discipline of Plant Pathology, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South AfricaPowdery mildew (PM) is an important disease of many plants worldwide. An in vitro screening protocol was developed for potential antagonists of PM isolated from naturally infected leaves of different plant species. A total of 2,000 isolates of bacteria, fungi...