Screening of the chemicals and decision of the optimal time of application for control of black ring spot symptom on Japanese radish [Raphanus sativus] root

• Published in: Bulletin of the Kanagawa Agricultural Technology Center (Japan) no. 149
• Main Authors: Uekusa, H.(Kanagawa-ken. Agricultural Technology Center, Hiratsuka (Japan)), Kusano, K, Sasakura, S, Ogawa, J, Fukasawa, C, Orihara, N, Kobayashi, M
• Format: Journal Article
• Language: Japanese
• Published: 01.03.2007
• Subjects: ALBUGO; APPLICATION METHODS; CHEMICAL CONTROL; CHLOROTHALONIL; CLOROTALONIL; CONTROL QUIMICO; ENFERMEDADES FUNGOSAS; ENSAYO; FONGICIDE; FUNGAL DISEASES; FUNGICIDAS; FUNGICIDES; LUTTE CHIMIQUE; MALADIE FONGIQUE; METHODE D'APPLICATION; METODOS DE APLICACION; RACINE; RAICES; RAPHANUS SATIVUS; ROOTS; TESTAGE; TESTING
• ISSN: 1881-3305

Black ring spot of radish was studied to screen control chemicals and determine treatment timing from 1998 to 2004. The screening test using nine wettable powders, including TPN wettable powder, and a granule for mixing with soil revealed the following were highly effective for controlling white rust and black ring spot: TPN wettable powder, Kasugamycin-copper wettable powder, Dithianon-copper wettable powder, Cyazofamid wettable powder, Azoxystrobin wettable powder, Metalaxyl-Manzeb wettable powder, Cymoxanil-Famoxadone wettable powder, Metalaxyl-TPN wettable powder, and Azoxystrobin-TPN wettable powder. Although less effective than TPN wettable powder spray, Metalaxyl granule showed effects for white rust and black ring spot. To study the optimal timing for control, the TPN wettable powder was applied to four radish crops in the winters of 1998, 1999, 2002, and 2003. The results showed that spraying one or twice between days 7 and 30 (mid October to early in November) after thinning was effective for controlling black ring spot.