Detection, transmission and control of leaf scald of sugarcane caused by Xanthomonas albilineans (Ashby) Dowson

Code (CO)	MSI99P2029
Author (AU)	Saumtally, S. Médan, H. Autrey, L. J. C.
Title - English (ET)	Detection, transmission and control of leaf scald of sugarcane caused by Xanthomonas albilineans (Ashby) Dowson
Document Type(DT)	Periodical article
Date of publication (DP)	1996
Series (SE)	Proc. int. Soc. Sug. Cane Technol.
Source (SO)	22, 477-483
Notes (NO)	Abstract published in the joint issue of International Sugar Journal 97, no. 1161, September 1995, vol. 97 no. 1162, October 1995, and Sugar Cane, September/October 1995 and in Sugar Cane 1995 (6): 25
Language of text (LT)	En
Language of summaries (LS)	En Fr Es
Abstract (AB)	The latent phase of leaf scald of sugarcane caused by Xanthomonas albilineans was followed in the two highly susceptible varieties M292/70 and M1557/70. Detection was carried out by immunofluorescence microscopy and by isolation of the bacterium. In variety M292/70, 6 out of 10 symptomless samples examined were positive while 8 out of 10 samples of M1557/70 with no symptoms were found to be infected. Transmission of the pathogen in the preparation of cuttings was found to occur up to the fifth cutting when a knife was dipped in a bacterial suspension or infected juice while transmission to the second cutting occurred when a knife was contaminated by cutting diseased canes. In the field, infection was found to occur up to the 20th stool, after cutting a one-meter row of infected cane. Control of leaf scald in infected cuttings was investigated by testing 79 heat treatments including microwave treatments. The most effective treatment was the cold soak long hot water t reatment (CSLHWT - soaking of cuttings for 48 hrs in cold water followed by hot water treatment at 50°C/3h) although on an industrial scale, a small percentage of escapes occurred. By arranging the cuttings in parallel or perpendicular layers separated by wooden spacers, the reduced infection from 0.3 per cent to 0.03 per cent. The studies undertaken demonstrated the high risk of using symptomless plants as planting material, the efficient transmission of leaf scald by knife and the efficacy of the CSLHWT in the elimination of the pathogen from setts.
Descriptors - English (DE)	SUGARCANE XANTHOMONAS ALBILINEANS TRANSMISSION DETECTION DISEASES HOT WATER TREATMENT HEAT TREATMENT PATHOGENS LEAF SCALD
Descriptors - Geographic (DG)	MAURITIUS
Sort Key 1(K1)	Sugarcane: Diseases and disease management
Date record entered (DA)	1995-09-26
Language of analysis (LA)	En
Location (LO)	LIB
Processing status (PS)	CAT
MSIRI Staff (MS)	PATH