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Evaluating Two Mass Screening Methods for Tungro Disease Resistance

Azzam, O., Coloquio, E., Tiongco, E.R., & Cabunagan, R.C. (1998) Evaluating Two Mass Screening Methods for Tungro Disease Resistance. IRRI Discussion Paper Series, 24.

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Abstract

Tungro is one of the most destructive viral diseases of rice in South and Southeast Asia. It is associated with two viruses---rice tungro bacilliform virus (RTBV) ,and rice tungro spherical virus (RTSV) (Hibino et al 1978). Both viruses are transmitted by the green leafhopper (GLH) Nephotettix virescens (Ling 1979), However, prior acquisition of RTSV is required for Ihe transmission of RTBV alone (Hibino 1983). Plants infected with both viruses show severe stunting and yellowing. Those infected with RTBV alone show mild stunting but no leaf discoloration whereas those infected with RTSV alone do not show any apparent symptoms (Hibino el al 1978). Since the late 1960s, tungro has been mainly managed through varietal resistance (Khush 1989). The instability of resistant varieties in the field (Dahal et .a1 1990) led to a reexamination of the nature of the incorporated sources of resistance and to the adoption of more precise and more accurate screening methods.

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ID Code: 39801
Item Type: Journal Article
Additional URLs:
Keywords: Tungro disease resistance, Two mass screening methods, Evaluating, Philippines, International Rice Research Institute, Jefferson, Osmat, Ossmat, Azzam
Subjects: Australian and New Zealand Standard Research Classification > AGRICULTURAL AND VETERINARY SCIENCES (070000) > HORTICULTURAL PRODUCTION (070600)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 1998 International Rice Research Institute
Deposited On: 07 Apr 2011 08:46
Last Modified: 27 Dec 2012 10:41

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