(Green et al., 1960) (Plate 3 8)
Sr9 (Knott and Anderson, 1956).
Low Infection Type
1- to 2, 23.
Low (Green et al., 1960; Loegering and Harmon, 1969).
Common wheat. Sr9a was first reported in Red Egyptian.
Wheats with Sr9a produce differential seedling responses in North America (Green et al., 1960), central America, Brazil and possibly Kenya (Luig, 1983). Sr9a is ineffective in tests with Australian pathotypes (Green et al., 1960) and on the Indian subcontinent.
i: ISr9a-Ra C.I.14169 (Loegering and Harmon, 1969); Red Egyptian/6*Marquis (Green et al., 1960); Red Egyptian/10*Marquis (Knott, 1965); Sr9a/9*LMPG (Knott, 1990).
s: Chinese Spring*4/Red Egyptian 2B (Sears et al., 1957).
v: Red Egyptian C.I. 12345 Sr6 Sr8a (Knott and Anderson, 1956).
CIMMYT: Lerma Rojo 64 Sr2 Sr6 Sr7b. Inia 66 Sr2 Sr8a Sr11.
Europe: French Peace Sr7a Sr13 (Knott, 1983).
USA: TAM107. Centurk Sr5 Sr6 Sr8a Sr17. Sentinel Sr6 Sr8a Sr17. Colt Sr6 Sr8a Sr17 Sr24.
Use in Agriculture
Not widely used.