Meeting the Challenge of Yellow Rust in Cereal Crops - ICARDA

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Table 2. Cross or pedigree of some CIMMYT advanced lines
used as supplemental yellow rust differentials in the nursery
Line
KVZ/7C
HAR 719 LIRA" S"
HAR 727
HAR 720
HAR 627
HAR 1331
HAR 1349
HAR 729
HAR 1003
Cross or pedigree
Peg "S"
HAR 421 BOW 74
HAR 723
HAR 934
HAR 1018
HAR 1038
HAR 743
HAR 733
HAR 820
HAR 845
Carpento OR Carp
BOW 74 , AV × KAL - BB/ WOP"S"
L2266-1406 101 × BUC "S" / VPM-MOP 83.11.48 × NAC
KIME #23/4/CN067/1C//KAL/BB/3/PCI"S"/S/BOW"S"
ZD"S"/PATO(B)//CHRC"S"/3/ALDAN"S"/B/T"S"
CHILERO, (4777(2)XFKN-GB/VER"S") BUS"S'-PVN"S"
TIJ 788.1039/PVN76
2109.36/VEE"S"/4/WRM//RAL/BB/3/KAL/BB//ALO"S"
KVZ/3/TOB/CTFN//BB/4/B/BW"S"/S/TSH"S"
BOW"S"-VEE"S"
(4777(2) × FKN -GB/VEE"-PVN"S"
MYNA"S"-VUL"S"
Results and discussion
Although the Ethiopian Wheat Rust Trap Nursery was tested at 12 locations in
Ethiopia, only at six locations did yellow rust epidemics occur every year,
namely Meraro, Bekoji, Sinana, Arsi Robe and Kulumsa. Hence the conclusions
of this experiment depend on the data from only these locations. Table 3
indicates the reaction to yellow rust of commercial cultivars released from
1970–1997. The results indicate that commercial cultivars originating from
Kenya, such as Enkoy and K62954-A, and the Ethiopian cultivar ET-13A2 have
been moderately susceptible to yellow rust, with low severity until 2001.
K62954-A and ET-13A2 have been grown for more than two decades and are
still widely grown by large-scale state farms and small-scale subsistence
farmers.
Pavon 76, which is believed to have the Sr2 gene complex, has also been
moderately susceptible to yellow rust, with low severity until 2000. However,
the severity of yellow rust increased in 2001 and 2002. This cultivar is also
believed to have partial resistance to yellow rust. At the same time, cultivars
recently released, such as Wabe, Kubsa, Abola and Magal, are becoming
susceptible to yellow rust.