Browsing Research Output by Author "11844825 - McDonald, Alexander Henrique"
Now showing items 1-15 of 15
-
Comparative cellular responses in susceptible and resistant soybean cultivars infected by Meloidogyne incognita
Fourie, Hendrika; McDonald, Alexander H.; De Waele, Dirk; Jordaan, Anine (Brill Academic Publishers, 2013)Meloidogyne incognita, a predominant nematode parasite of soybean in South Africa, increasingly threatens production of the crop as it is expanding to maize-producing areas infected by this nematode. The parasitic ... -
Differential responses of resistant and susceptible groundnut genotypes at cellular level to Ditylenchus africanus
Jordaan, Anine; Steenkamp, Sonia; McDonald, Alexander Henrique; De Waele, Dirk Gaby Marthe Albert (Brill Academy Publishers, 2011)Ditylenchus africanus causes cellular breakdown in pod tissue of susceptible groundnut cultivars. The histopathology of this nematode on a resistant genotype was studied using light microscopy and compared with the ... -
Host and yield responses of soybean genotypes resistant or susceptible to Meloidogyne incognita in vivo
Fourie, H.; McDonald, A.H.; De Waele, D. (Taylor & Francis, 2013)Host and yield responses of soybean genotypes resistant to Meloidogyne incognita were verified in semi-field and field trials at four different localities in South Africa. The resistant cultivar LS5995 and susceptible ... -
Host suitability of selected South African maize genotypes to the root-knot nematode species Meloidogyne incognita race 2 and Meloidogynejavanica: a preliminary study
Fourie, Hendrika; Ngobeni, G.L.; McDonald, Alexander Henrique; Mashela, P.W. (Scientific Publishing (NISC), 2011)Thirty-one commercial maize (Zea mays L.) hybrids and open-pollinated varieties (OPV's) were screened in separate greenhouse trials with a resistant inbred line MP712W as reference genotype for host suitability to Meloidogyne ... -
Indications of variation in host suitability to root knot nematode populations in commercial tomato varieties
Fourie, Hendrika; Mothata, Tshiamo; Ntidi, Keikantsemang Nancy; Mc Donald, Alexander Henrique; De Waele, Dirk Gaby Marthe Albert Dgma (Academic journals, 2012)The host suitability of 21 local, commercial tomato varieties were evaluated in concurrent greenhouse trials for resistance to Meloidogyne incognita race 2 and Meloidogyne javanica, respectively. M. incognita race-2-resistance ... -
Morphological and molecular studies on Aphelenchoides arachidis Bos, 1977 (Tylenchina: Aphelenchoididae) from groundnuts in South Africa
Lesufi, Moses M.; McDonald, Alex H.; Tiedt, Louwrens R.; Swart, Antoinette; Knoetze, Rinus; Truter, Mariette (Brill Academic Publishers, 2015)Aphelenchoides arachidis is reported for the first time from South Africa and for the fourth time outside Nigeria. The A. arachidis-infested pods from South Africa showed the following symptoms: small seeds with the testa ... -
Nematode pests of leguminous and oilseed crops
Fourie, Hendrika; De Waele, Dirk; McDonald, Alexander H.; Steenkamp, Sonia (Springer, 2017)Sunflower ranks first among the legume and oilseed crops produced in South Africa, followed by soybean. The production of Bambara groundnut, cowpea, dry bean, groundnut and lupin is practised on a much smaller scale. The ... -
Nematode pests of maize and other cereal crops
McDonald, Alexander H.; De Waele, Dirk; Fourie, Hendrika (Springer, 2017)Maize is the most important cereal crop grown in South Africa, followed by wheat and grain sorghum. Yields of grain crops usually vary considerably between years, mainly due to highly variable rainfall. The most widespread ... -
Nematode pests threatening soybean production in South Africa, with reference to Meloidogyne
Fourie, Hendrika; De Waele, Dirk; McDonald, Alexander H.; Mienie, Charlotte; Marais, Mariette (AOSIS, 2015)The area planted to soybean in South Africa has increased by 54% since the 2009 growing season, mainly as a result of the increasing demand for protein-rich food and fodder sources. Moreover, the introduction of advanced ... -
Plant-parasitic nematodes associated with weeds in subsistence agriculture in South Africa
Ntidi, Keikantsemang N.; Fourie, Hendrika; Mc Donald, Alexander H.; De Waele, Dirk; Mienie, Charlotte M.S. (Brill Academic Publishers, 2012)Twenty-nine plant-parasitic nematode species belonging to 15 genera, as well as two fungus-feeding nematode genera and one species, were identified from soil and root samples of weeds collected from 67 localities situated ... -
Population responses of plant-parasitic nematodes in selected crop rotations over five seasons in organic cotton production
Van Biljon, E.R.; McDonald, A.H.; Fourie, H. (Organization Trop Amer Nematologists, 2015)Crops with resistance or tolerance to the root-knot nematode, Meloidogyne incognita race 4, were evaluated for management of plant-parasitic nematodes in organic cotton production for five consecutive seasons. During the ... -
Relationships between initial population densities of Meloidogyne incognita race 2 and nematode population development in terms of variable soybean resistance
De Waele, Dirk; Fourie, Hendrika; McDonald, Alexander Henrique (Society of Nematologists (SON), 2010) -
Reproduction and damage potential of five geographical Ditylenchus africanus populations on peanut
Steenkamp, Sonia; De Waele, Dirk; McDonald, Alexander (Society of Nematologists, 2016)Ditylenchus africanus affects peanut quality, which leads to downgrading of consignments and economic losses for producers. This nematode is difficult to control and host-plant resistance may be the most effective way to ... -
Resistance to ditylenchus africanus present in peanut breeding lines
De Waele, Dirk; McDonald, Alexander Henrique; Steenkamp, Sonia (Society of Nematologists, 2010) -
Sampling variation in the quantification of fumonisins in maize samples
Janse van Rensburg, B.; Flett, B.C.; McLarren, N.W.; McDonald, Alexander Henrique (Scientific Publishing (NISC), 2011)Fumonisins produced by F. verticillioides and F. proliferatum cause mycotoxicoses in horses, swine and rats and have been associated with oesophageal cancer in humans. Accurate measurement of mycotoxins is essential for ...