RESISTANCE IN BARLEY TO THE CORN LEAF APHID RHOPALOSIPHUM MAIDIS

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Abstract
A barley cultivar originally from Taiwan, EB-921, and its hybrid derivative, DL-117, were resistant, but not immune, to the corn leaf aphid Rhopalosiphum maidis (Fitch) in greenhouse tests. DL-117 was the more resistant of the two. These cultivars showed no resistance to four other species of grain-infesting aphids occurring in Manitoba. Colonies of R. maidis were smaller on plants of DL-117 and EB-921 infected with barley yellow dwarf virus than on uninfected plants. Fecundity of adults of R. maidis was similar for DL-117 and a susceptible barley cultivar, Parkland, but the mortality rate of nymphs reared on seedlings of DL-117 at the two-or four-leaf stage was considerably greater than the rate on Parkland or on Herta, another susceptible cultivar. Hybrids between DL-117 and two barley cultivars susceptible to R. maidis were resistant to this aphid, indicating that inheritance of resistance to R. maidis was dominant in effect.

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