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Browsing Natural and Agricultural Sciences by UP Author "Pietersen, Gerhard"
Now showing items 1-20 of 35
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Strydom, Elrea; Pietersen, Gerhard (Springer, 2018-05)Soybean blotchy mosaic virus (SbBMV) is an important virus of soybean in the warmer regions of South Africa. The presence of the virus is associated with blotchy mosaic symptoms on soybean leaves and significant annual ...
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Kruger, Kerstin; De Klerk, Andre; Douglas-Smit, Nicoleen; Joubert, Jeff; Pietersen, Gerhard; Stiller, Michael (Bulletin of Insectology, 2011)Since the discovery of aster yellows phytoplasma on grapevine in South Africa in 2006, a concerted effort by various research groups to identify the vector(s) was co-ordinated by Winetech. This included qualitative and ...
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Lamprecht, R.L. (Renate Luise); Pietersen, Gerhard; Kasdorf, G.G.F.; Nel, Louis Hendrik (Springer, 2009)A previously uncharacterised plant rhabdovirus, infecting Bermuda grass (Cynodon dactylon) in the North West Province, South Africa, has been found. To determine the morphology and virion size of this virus, embedded ...
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Zablocki, Olivier; Pietersen, Gerhard (Springer, 2014-08)Tristeza disease (caused by citrus tristeza virus, CTV) is currently controlled in South Africa by means of cross-protection. In this study, we characterized the CTV populations of three grapefruit mild strain 12 (GFMS12) ...
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Doddapaneni, Harshavardhan; Liao, Huihong; Lin, Hong; Bai, Xianjin; Zhao, Xiaolong; Civerolo, Edwin L.; Irey, Michael; Coletta-Filho, Helvecio; Pietersen, Gerhard (BioMed Central, 2008-08)BACKGROUND: Huanglongbing (HLB, previously known as citrus greening), is associated with Candidatus Liberibacter species and is a serious threat to citrus production world-wide. The pathogen is a Gram negative, unculturable, ...
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Kleynhans, Jackie; Pietersen, Gerhard (Elsevier, 2016-11)Citrus tristeza virus (CTV) is the most economically important virus found on citrus and influences production worldwide. The 3‟ half of the RNA genome is generally conserved amongst sources, whereas the 5‟ portion is more ...
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Read, David Alan; Thompson, Genevieve D.; Swanevelder, Dirk; Pietersen, Gerhard (Springer, 2021-12)A total of 229 Vitis cultivars were sampled from a collection in Stellenbosch, Western Cape, South Africa and subjected to an RNAtag-seq workflow and Illumina HiSeq 2500 sequencing. Following de novo assembly and initial ...
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Strydom, Elrea; Pietersen, Gerhard (Elsevier, 2018-09)Soybean blotchy mosaic virus (SbBMV), a plant virus of the genus Cytorhabdovirus is an economically important virus of soybean reported only from the warmer, lower-lying soybean production areas in South Africa. The virus ...
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Read, David Alan; Pietersen, Gerhard (Springer, 2017-06)Grapefruit cultivars are highly sensitive to CTV infections and in order to increase their productive lifespan, the Southern African citrus industry makes use of cross-protection. However, the breakdown of cross-protection ...
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Rey, Marie E.C.; Ndunguru, Joseph; Berrie, Leigh C.; Paximadis, Maria; Berry, Shaun; Cossa, Nurbibi; Nuaila, Valter N.; Mabasa, Kenneth G.; Abraham, Natasha; Rybicki, Edward P.; Martin, Darren; Pietersen, Gerhard; Esterhuizen, Lindy L. (MDPI, 2012-09-24)The family Geminiviridae comprises a group of plant-infecting circular ssDNA viruses that severely constrain agricultural production throughout the temperate regions of the world, and are a particularly serious threat to ...
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Strydom, Elrea; Pietersen, Gerhard (Springer, 2018-05)Infection of soybean by the plant cytorhabdovirus soybean blotchy mosaic virus (SbBMV) results in significant yield losses in the temperate, lower-lying soybean production regions of South Africa. A 277 bp portion of the ...
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Coetzee, Beatrix; Douglas-Smit, Nicoleen; Maree, Hans J.; Burger, Johan T.; Pietersen, Gerhard; Kruger, Kerstin (American Society for Microbiology, 2019-04)Here, we report the draft genome sequence of a phytoplasma discovered in grapevine. The genome size is 600,116 nucleotides (nt), with 597 predicted open reading frames. It is most similar to a maize bushy stunt phytoplasma ...
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New, S.A.; Van Heerden, S.W.; Pietersen, Gerhard; Esterhuizen, L.L. (American Phytopathological Society, 2016)No abstract available.
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Read, David Alan; Featherstone, Jonathan; Rees, David Jasper Gilbert; Thompson, Genevieve Dawn; Roberts, Ronel; Flett, Bradley Charles; Mashingaidze, Kingston; Berger, David Kenneth; Welgemoed, Tanya; Pietersen, Gerhard; Schulze, Susanna Elizabeth; Kiula, Barnabas Anthony; Kullaya, Alois; Mbega, Ernest (Springer, 2019-02)Maize yellow mosaic virus (MaYMV) has been reported from China, Ecuador, Brazil and Burkino Faso on maize since 2016 and appears to be an emerging virus with a wide global distribution. Thirty-five maize samples with varying ...
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Schulze, Azille; Roberts, Ronel; Pietersen, Gerhard (American Phytopathological Society, 2017-05)The potyvirus, Bean yellow mosaic virus (BYMV) is an economically important plant virus which infects many leguminous crops (family Fabaceae) as well as members of the Liliaceae. BYMV has been detected in South Africa ...
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Roberts, Ronel; Lin, Hong; Pietersen, Gerhard (Springer, 2021-02)Citrus Greening disease (CG) in South Africa (SA) is associated with the fastidious bacterium ‘Candidatus Liberibacter africanus’ (Laf). It has been observed that Laf isolates obtained from different geographic localities ...
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Read, David Alan; Thompson, Genevieve Dawn; Le Cordeur, Nathan; Swanevelder, Dirk; Pietersen, Gerhard (Springer, 2022-02)
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Scott, Katherine Anne; Hlela, Quinsile; Zablocki, Olivier; Read, David Alan; Van Vuuren, Stephanus; Pietersen, Gerhard (Springer, 2013-01)Citrus tristeza virus (CTV) causes severe losses in grapefruit production in South Africa and requires mild strain cross-protection to maintain production. Unfortunately cross-protection breakdown of the pre4 immunizing ...
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Read, David Alan; Pietersen, Gerhard (Springer, 2015-07)Grapefruit cultivars (Citrus paradisi Macfad.) are extremely sensitive to Citrus tristeza virus (CTV) infections and are pre-immunized with mild-strain crossprotecting sources not containing components that elicit symptoms ...
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Pietersen, Gerhard; Pietersen, G. (Jnr); Pietersen, I.; Stiller, M. (South African Society for Enology and Viticulture, 2018)Aster yellows phytoplasma (AY), only recently reported in South Africa and still limited in its distribution in the country, causes a serious disease of grapevine. A leafhopper, Mgenia fuscovaria (Stål)(Hemiptera: Cicadellidae), ...
Now showing items 1-20 of 35