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• W1993364784 abstract "Medinilla magnifica Lindl., Mandevilla splendens (Hook.) Woodson, the hybrid Mandevilla × amoena ‘Alice du Pont’ (pink allamanda), and various species of Allamanda, such as A. cathartica L. and A. blanchetii A. DC. (purple allamanda), are grown in Sicily as ornamentals. After a frost in early December 2001, a sudden wilt of container-grown cuttings of these tropical species was observed in a plastic-covered production greenhouse, with ≈30% of M. magnifica plants and 70% of Mandevilla and Allamanda plants affected. Medinilla plants (≈35 cm high) had been rooted in trays and transplanted individually in 30-cm-diameter pots. Allamanda (recently rooted cuttings) and Mandevilla (well-established) plants showed symptoms ranging from a dark brown rot at the base of stems to a tan-to-brown rot of stem midsection, respectively. Tissues surrounding lesions were water-soaked and covered by gray mycelium. On Allamanda and Mandevilla plants, lesions extended rapidly to lateral branches, and to the petiole and midrib of leaves that became chlorotic and wilted. As stems were girdled, infected plants collapsed, although the roots appeared healthy. Botrytis cinerea Pers.:Fr. was consistently isolated from infected stem pieces surface-disinfested with 1% NaOCl for 1 min and placed on potato dextrose agar (PDA, Oxoid). Morphology and size (6 to 8 × 8 to 12 μm, modal values 7 × 10 μm) of conidia produced on PDA matched those reported for B. cinerea (1). Dark, spherical, and irregularly shaped sclerotia (1 to 6 mm diameter, mean size 3.3 × 2.3 mm) were produced on PDA. Pathogenicity of a single-conidium isolate isolated from M. magnifica was confirmed using two inoculation methods. Twenty 3-month-old cuttings of M. magnifica and pink and purple allamanda were sprayed with a conidial suspension (10 6 conidia per ml in a 2% glucose solution). A 2% glucose solution was sprayed on 20 control plants. Plants were sealed in transparent plastic bags for 7 days at 15 to 24°C. Typical symptoms developed only on stems of inoculated pink and purple allamanda cuttings 7 days after inoculation. B. cinerea was reisolated from affected tissues. In a separate test, stems of 10 6-month-old plants of M. magnifica and pink allamanda were inoculated by inserting a 3-mm plug taken from 10-day-old sporulating colonies growing on PDA on a superficial cut made with a sterile scalpel. The inoculated wounds were sealed with Parafilm. Ten wounded but noninoculated plants were used as controls. Plants were kept in high humidity at 10 to 20°C. After 10 days, stem necrosis, leaf chlorosis, and wilt were observed on inoculated pink allamanda plants. On inoculated M. magnifica plants, necrotic lesions were observed on stems (45 to 70 mm long and 10 to 18 mm wide) covered by gray mycelium, but the stem was not girdled. B. cinerea was reisolated from infected tissues of inoculated plants to complete Koch's postulates. No lesions developed on noninoculated control plants. To our knowledge, this is the first report from Italy of Botrytis blight on these species. The occurrence of frost may have predisposed these tropical species to infection by B. cinerea. Reference: (1) M. B. Ellis and J. M. Waller. No 431 in: Descriptions of Pathogenic Fungi and Bacteria, CMI, Kew, Surrey, UK, 1974." @default.
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• W1993364784 date "2002-10-01" @default.
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• W1993364784 title "First Report of Botrytis Blight on <i>Medinilla magnifica</i> and Various Species of <i>Mandevilla</i> and <i>Allamanda</i> in Italy" @default.
• W1993364784 doi "https://doi.org/10.1094/pdis.2002.86.10.1175a" @default.
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