Document Type : Original Article
Authors
1
Maize and Sugar Crops Dis. Res. Sec., Plant Pathol. Res. Inst., A.R.C., Giza, Egypt.
2
Maize and Sugar Crops Dis. Res. Sec., Plant Pathol. Res. Inst., A.R.C., Giza, Egypt
3
Maize Res. Section, Field Crops Res. Inst., A.R.C., Giza, Egypt
Abstract
Twenty-one Egyptian maize genotypes were evaluated for their resistance against late wilt disease under field artificial infection in Gemmeiza Agricultural Research Station, ARC, during 2011 and 2012 growing seasons. Relationship between the disease incidence and losses in grain yield and protein content were determined. Maize genotypes differed greatly in their reaction to disease incidence (8.22 up to 33.94%). The resistance exhibited by S.C 10 hybrid and inbred line Sd.7 (< 10% infection). Meanwhile, Gz.658, S.C166 and T.W.C 352 were susceptible (> 30% infection). The other genotypes showed infection type ranged from moderately resistance (Gm.2, Gm.4, Sd.63, Gz 639, S.C 24, S.C 167, T.W.C 321 and T.W.C 324) and moderately susceptible (Gm.18, Gm.1021, Gz.656, S.C 52, S.C 124, S.C 168, T.W.C 322 and T.W.C 323). The disease infection reduced grain yield from 5.67 to 30.37% and protein content from 11.99 to 37.87% in all genotypes tested. The highest reduction in yield and protein were recorded in the susceptible genotypes. A highly significant positive correlation was found between late wilt incidence and losses of grain yield (r = 0.932 **) and protein (r = 0.955**). Resistant and moderately resistance of Egyptian lines could be used as a parent for production of new resistant hybrids to late wilt.
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