Reaction of green leafhopper (GLH)-resistant varieties to rice tungro virus (RTV) complex [Philippines]
1986
Tiongco, E.R. | Cabunagan, R.C. | Hibino, H. (International Rice Research Inst., Los Banos, Laguna (Philippines). Plant Pathology Dept.)
ARC 11554, Habiganj DW8, and Ptb 18 had low infection with rice tungro bacilliform (RTBV) + rice tungro spherical (RTSV) viruses or RTBV alone, regardless of the number of GLH per plant. That indicated stability of their resistance to RTV complex. RTBV infection of ASD7, Gam Pai 30-12-15, Gam Pai 30-12-30, and Palasithari increased with the number of viruliferous GLH per plant. Jhingasail had mild yellowing and stunting but high RTBV + RTSV infection. ASD7 had severe yellowing and stunting but high RTBV infection. Results indicate there are two types of RTV resistance: (a) high resistance to RTBV + RTSV and RTBV alone even with high insect pressure and, (b) increasing RTBV infection with increased insect pressure. In the latter case, however, infected varieties may not be a virus source for the spread of the disease. Furthermore, resistance to RTV complex is not always correlated with resistance to the vector, as shown by habiganj DW8
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