Characterization of Rhizoctonia spp. causing root and stem rot of miniature rose

Citation
A. Priyatmojo et al., Characterization of Rhizoctonia spp. causing root and stem rot of miniature rose, PLANT DIS, 85(11), 2001, pp. 1200-1205
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
PLANT DISEASE
ISSN journal
0191-2917 → ACNP
Volume
85
Issue
11
Year of publication
2001
Pages
1200 - 1205
Database
ISI
SICI code
0191-2917(200111)85:11<1200:CORSCR>2.0.ZU;2-L
Abstract
Root and stem rot of miniature rose (Rosa hybrida L.) was observed in comme rcial glasshouse-grown roses in Gifu prefecture, Japan, during the summer a nd fall of 1997 and 1998. One hundred and fifty-three isolates of Rhizocton ia spp. were obtained from infected roots and stems. Of the 153 isolates, 9 had binucleate and 144 had multinucleate vegetative hyphal cells. Binuclea te Rhizoctonia failed to anastomose with tester isolates of anastomosis gro ups (AG)-A through -S (not including AG-J and AG-M). Of 144 isolates identi fied as R. solani, 83.3% were AG 2-2 IIIB and 16.7% were AG 4 HG-I. Five is olates from each group caused severe rot and mortality on cuttings during r ooting. Pathogenicity of Rhizoctonia spp. varied on three different ages of miniature roses cv. Silk. Isolates of AG 4 HG-I caused root and stem rot a nd mortality on 15-, 25-, and 40-day-old plants, whereas isolates of AG-2-2 IIIB caused root and stem rot and mortality on 15- and 25-day-old plants, but light root rot on 40-day-old plants. Isolates of binucleate Rhizoctonia caused root and stem rot and mortality only on 15-day-old plants.