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Modern Genetic Analysis Chapter 1. Genetics and the Organism Genetics and Human Affairs
Table 1-1. Pest-Resistant Strains of Rice

|  | DISEASES | INSECTS

Strain | Year developed | Blast fungus | Bacterial blight | Leaf-streak virus | Grassy stunt virus | Tungro virus | Green leafhopper | Brown hopper | Stem borer

IR 8 | 1966 | MR | S | S | S | S | R | S | MS
IR 5 | 1967 | S | S | MS | S | S | R | S | S
IR 20 | 1969 | MR | R | MR | S | R | R | S | MS
IR 22 | 1969 | S | R | MS | S | S | S | S | S
IR 24 | 1971 | S | S | MR | S | MR | R | S | S
IR 26 | 1973 | MR | R | MR | MR | R | R | R | MR

NOTE: The entries describe each strain's susceptibility or resistance to each pest as follows: S = susceptible; MS = moderately susceptible; MR = moderately resistant; R = resistant. (From Research Highlights,International Rice Research Institution, 1973, p. 11.)

© 1999 by W. H. Freeman and Company. All rights reserved.