摘要:

Strains ofStemphylium vesicarium(Wallr.) Simmons, were collected from asparagus plants (Asparagus qfficinalisL.) from different regions of New Zealand. The pathogenic variation among five strains was compared in glasshouse tests using eightAsparagustaxa (six resistant spp. and two susceptible cultivars ofA. officinalis, ‘Rutgers Beacon’ and ‘Mary Washington’). Disease assessments, based on percentage stem area necrosis, were made 10–14 days after inoculation. Disease severity (% stem area necrosis) for different strain/taxa interactions, after inoculation, ranged from 0 to 55%. One of the isolates tested was found to be a saprophytic strain ofS. vesicarium. Differences in pathogenicity (P< 0.05) among strains were found.Stemphyliumstrain/Asparagustaxa interactions were highly significant (P< 0.001). Three highly resistant taxa ofAsparagus—A. virgatusBak.,A. lar cinusBurch.,andA. compactusSailers—are useful sources for breeding for resistance toStemphyliumleaf spot on asparagus.

ISSN:0114-0671    

DOI:10.1080/01140671.1991.10418108

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The role ofPhytophthoraspecies in the development of root rot in kiwifruit was investigated. Seven species were isolated from soil samples collected from the base of unhealthy kiwifruit vines in six orchards in the Auckland region, New Zealand, using a soil baiting technique. The species were identified asPhytophthora cinnamomi,P. citricola,P. cryptogea,P. gonapodyides,P. megasperma,P.sterile A andP.sterile B. With the exception ofP. megasperma, all species were pathogenic against 9-month-old kiwifruit plants in glasshouse tests. In particular,P. cryptogeaandP. cinnamomiwere highly virulent causing extensive rotting of the fine fibrous roots of rootstocks of cultivars Hayward and Bruno. Cultivar Hayward was more susceptible to infection than Bruno by four of the six pathogenic species.

ISSN:0114-0671    

DOI:10.1080/01140671.1991.10418109

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0114-0671    

DOI:10.1080/01140671.1991.10418110

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0114-0671    

DOI:10.1080/01140671.1991.10418097

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor