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- W2150657891 abstract "During the period September 1972 to December 1977, 7548 fungal isolates were obtained from roots and rhizosphere soil of stunted, dying or dead grapevines in South Africa. Most (46,8%) of the isolates belonged to the genera Phytophthora and pythium. The predominant Phytophthora species was P. cinnamomi Rands (2075 isolates) followed by P. cactoium (Lebert & Cohn) Schroeter (19 isolates), P. parasitica Dastur (14 isolates) and P. cryptogea Pethybridge & Lafferty (II isolates). All four Phytophthora spp. were shown to be pathogenic to certain grapevine rootstocks with P. cinnamomi appearing to be the most virulent, killing nearly half the number of test plants. Of the 1 409 isolates of Phythium spp. the dominant were P. ultimum Trow (821 isolates) followed by P. aphanidermatum (Edson) Fitzpatrick (230 isolates), P. sylvaticum complex (201 isolates) and P. irregulare complex (157 isolates). All four Pythium spp. were pathogenic to grapevine rootstocks with P. ultimum being the most virulent. Macrophomina phaseolina (Tassi) Goid. [Rhizoctonia batati cola (Taub.) Briton-Jonesl and Rhizoctonia solani Kiihn were pathogenic to 101-14 Mgt (Vitis riparia x Vitis rupestris) and Vitis champini var. Salt Creek, respectively. Uittreksel DIE ROL VAN SWAMME BY WORTEL VERROTTING VAN WINGER DE IN WES-KAAPLAND Vanaf September 1972 tot Desember 1977 is 7 548 slVamisolate vanaf wortels van wingerdstokke gefsoleer wat vertraagde groei openbaar het, besig was om dood te gaan of reeds dood was. Van al hierdie isolate was 46,8 % spesies van Phytophthora en Pythium. Van die Phytophthora spp. wat geisoleer is, het P. cinnamomi Rands (2075 isolate), P. cactorum (Lebert & Cohn) Schroeter (19 isolate), P. parasitica Dastur (14 isolate) en P. cryptogea Pethybridge & Lafferty (II isolate) die meeste voorgekom. In patogenisiteitstudies is bewys dat al vier die Phytophthora spp. patogenies teen oor sekere wingerd-onderstokke is. P. cinnamomi wat feitlik helfie van die toetsplante gedood het, was die mees virulente patogeen van die vier Phytophthora spp. 'n Totaal van 1 409 isolate van Pythium spp. is verkry, met P. ultimum Trow (821 isolate), P. aphanidermatum (Edson) Fitzpatrick (230 isolate), P. sylvaticum-kompleks (201 isolate) en P. irregulare-kompleks (157 isolate) die mees algemene. AI vier die Pythium spp. was patogenies teenoor wingerdonderstokke met P. ultimum die mees virulente patogeen van die groep. Die rol van Pythium spp. by die herplantingsprobleem van (Vi tis aestivalis x Vitis cinerea x Vilis vinifera) Jacquez word bespreek, terwyl Macrophomina phaseolina (Tassi) Goid. (Rhizoctonia bataticola) (Taub.) Briton-Jones en Rhizoctonia solani Kuhn as patogene op (Vi tis riparia x Vitis rupestris) 101-14 Mgt en V. champini var. Salt Creek onderskeidelik, bewys word. Resume" @default.
- W2150657891 created "2016-06-24" @default.
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- W2150657891 date "1979-01-01" @default.
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- W2150657891 title "Fungi associated with root rot in vineyards in the Western Cape." @default.
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