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- W802364785 abstract "Fungi most commonly isolated from the roots and rhizosphere soil of dead and dying vines from 223 grapevine nurseries in the Southern and Western Cape Province were Pythium spp. (P. ultimum, P. aphanidermatum, P. sylvati7 cum complex, P. irregulare complex and P. rostratum complex) comprising 36,41 of the isolates and_Phytophthora spp. (P. cinnamomi, P. parasitica, P. cryptogea, P. cactorum and P. megasperma) comprising 23,5% of the isolates. In inoculation studies P. cinnamomi and P. parasitica caused severe root rot and death, whereas P. cryptogea caused rotting of the fine feeder roots and reduction in root mass but not death of the plants. Similar symptoms were also observed with the pythium spp. tested. P. megasperma was nonpathogenic. Other pathogens isolated were Rosellinia necatrix and. Sclerotium rolfsii. P. cinnamomi colonized 14%, 17% and 8% respectively of vine roots, vine canes, and wheat straw added to inoculated, nonsterilised soil. Colonization was more vigorous (24%, 64% and 19% of the roots, canes and straw respectively) in sterilised soil. The fungus was found in vine debris in soil 3 years after removal of the vines. • 15" @default.
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- W802364785 date "1983-12-01" @default.
- W802364785 modified "2023-09-27" @default.
- W802364785 title "Phytophthora cinnamomi root rot of grapevines in South Africa" @default.
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