ABSTRACT
The three wheat rusts, stripe, stem and leaf caused by Puccinia striiformis, P. graminis and P. recondita, sequently, are the most destructive diseases that threaten wheat production in Egypt, Therefore, resistant to these rusts are very important requirement for licensing the new cultivars released by National Wheat Research Program,, Agricultural Research Center (ARC). Egypt has been subjected to four sever attacks from the strip rust causal agent during the last decade of the last "century. This gives Egyptian wheat breeders good opportunity to develop new promising resistant cultivars and /or lines . Gemmiza 10 is one of the new wheat cultivars having high yielding potentiality and simultaneously, exhibiting high resistance to the three rusts.
A total of 97 field experiments were conducted at different levels of yield trials (preliminary and advanced) as well as verification yield trials in the farmers' fields during the period from 1999/2000 to 2003/2004. The obtained results proved the superiority of the new cultivar Gemmiza 10 as compared with the commercial checks Sakha 61, Sakha 69, Sids 1 and Giza 163 at both Delta and Middle Egypt in the old land and at El-Nubara region in the new reclaimed area. Moreover, the cultivar Gemmiza 10 expressed its high resistance to the three rusts . On the other hand, Gemmiza 10 seems to be sensitive to heat stress prevailing , usually in Upper Egypt during late wheat growing season. Therefore, Gemmiza 10 is highly recommended to be grown at El-De!ta , Middle Egypt and E!-Nubaria regions.