000			02762nab a22003017a 4500
001			G70648
003			MX-TxCIM
005			20230804155845.0
008			121211b |||p||p||||||| |z||| |
022			_a0032-0811
040			_aMX-TxCIM
041			_aeng
090			_aREP-1369
100	1		_aStewart, D.M. _930573
245	1	0	_aPhysiologic races of Puccinia graminis in the United States in 1963
260			_c1965. _aWashington, D.C. (USA) : _bBureau of Plant Industry,
340			_aPrinted
520			_aAmong races of wheat stem rust (Puccinia graminis var. tritici) race 56 predominated for the sixth consecutive year and accounted for 46% of 1536 isolates identified. Race 15B comprised 37%; 38, 5%; the 11-32 group, 5%; 17, 4%; and 14 other races and subraces the remaining 3%. Race 15B was the most prevalent race in the spring-wheat region for the fourth consecutive year, accounting for 49% of 503 isolates. The isolate designated as 15B-2, virulent on Langdon durum seedlings, accounted for 96% of 562 isolates. Race 38 and the 11-32 group were most common in the East Central Region. Race 32A, which attacks wheat varieties Selkirk, Bowie, and Frontana x (Kenya 58-Newthatch) line II-50-17, was isolated seven times from four States. A variant of race 17, designated as 17A, was identified for the first time in 1963. Lee wheat seedling are susceptible to this culture but resistant to the ordinary isolates of race 17. Among the supplemental test varieties, the new bread wheats Crim and Justin and the durums Wells and Lakota were highly resistant to all U.S. uredial isolates to wich they were tested, but Selkirk seedlings were susceptible to about 1%. Race 6F of oat stem rust (Puccinia graminis var. avenae), the most prevalent race in 1962, accounted for 70% of the isolates. Race 64F, which attacks all known commercial varieties in the United States, was next most prevalent with 10%; the 7 group (7, 7A, 7AF), 8%; and 13 other races and subraces the remaining 12%. About 93% of the isolates identified had virulence for either the host genes BC or F or both. Races 6F and 6AF were also identified from barberry in Virginia. Among 40 aecial isolates of wheat stem rust, 15 races and subraces were identified. Seedlings of the new variety Crim were moderately susceptible to an aecial culture of a new found in Washington.
546			_aText in English
595			_aRPC
650		7	_2AGROVOC _92130 _aPuccinia graminis
650		7	_2AGROVOC _91310 _aWheat
650		7	_2AGROVOC _926782 _aStem rust
700	1		_aCotter, R.U. _930574
700	1		_aRoberts, B.J. _930575
773	0		_tPlant Disease Reporter _gv. 49, no. 1, p. 63-67 _dBeltsville, MD (USA) : USDA. Agricultural Research Service, 1965. _wG444688 _x0032-0811
942			_cJA _2ddc
999			_c20621 _d20621