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231225s2006 xx |||||o 00| ||eng c |
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|a 10.1094/PD-90-0970B
|2 doi
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|a eng
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| 100 |
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|a Rivera, M C
|e verfasserin
|4 aut
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|a First Report of Botrytis Gray Mold on Common Calla Lily in Buenos Aires, Argentina
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|c 2006
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|a Text
|b txt
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 20.11.2019
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Common calla lily (Zantedeschia aethiopica (L.) Spreng., family Araceae) is an evergreen herbaceous South African ornamental plant that forms a tuft of fleshy-stalked, glossy, dark green leaves. At bloom during the summertime, large, funnel-shaped, waxy-white spaths that surround a bright yellow spadix form at the end of high stalks. In August 2003, large, irregular brown spots with a 3- to 4-mm yellow halo were observed on leaves of 10 plants growing near Japanese quince shrubs (Chaenomeles lagenaria (Loisel.) Koidz.) in Escobar, Buenos Aires. Debris of Japanese quince petals were attached to the center of the lesions with profuse sporulation of Botrytis cinerea Pers. (1). Pathogen spores were disposed on potato dextrose agar (PDA) and incubated at 22°C. Mycelium was initially whitish and turned gray with age. Black conidiophores bore botryose heads of hyaline, ellipsoid, unicellular conidia, gray in mass, 7.5 to 10.5 μm × 6.8 to 7.5 (average 9.2 to 7 μm). Black, irregular sclerotia formed at random in culture. Inoculum was prepared from 7-day-old cultures on PDA. Six flowering common calla lilies planted in 5-liter plastic pots were inoculated by spraying a suspension of 2.5 × 106 conidia per ml of sterile distilled water. Six healthy plants were sprayed with sterile distilled water. Each plant was covered with a transparent polyethylene bag for 3 days and kept at 21°C under a 12-h photoperiod. After a 12-day incubation period, leaves showed elliptic to irregular brown spots surrounded by yellow halos. Tiny round to irregular brown spots developed on flower spaths that finally blighted. Water-treated plants remained symptomless. Koch's postulates were fulfilled by pathogen reisolation from diseased organs. To our knowledge, this is the first report of B. cinerea on Z. aethiopica in Argentina. Infection efficiency of B. cinerea increases when inoculated petals are positioned on leaves (2), which has epidemiological importance in landscapes with association of plant species that are potential hosts of this pathogen. Reference: (1) M. V. Ellis and J. M. Waller. No. 431 in: Descriptions of Pathogenic Fungi and Bacteria. CMI, Kew, Surrey, UK, 1974. (2) C. Sirjusingh et al. Plant Dis. 80:154, 1996
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|a Journal Article
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|a Lopez, S E
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Plant disease
|d 1997
|g 90(2006), 7 vom: 01. Juli, Seite 970
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|x 0191-2917
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|g volume:90
|g year:2006
|g number:7
|g day:01
|g month:07
|g pages:970
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|u http://dx.doi.org/10.1094/PD-90-0970B
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