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Host Reaction To Black Steam Rust In Wheat During Late Epiphytotic Form In
Baghdad Area
Mouhamed A. Al-Hamdany and Hassan A. Abas.
Agriculturel and
Biological Researches Center, P.O. Box 765, Baghdad, Iraq.
E-mail: itsd@uruklink.net
Abstract
Host reaction of wheat cultivars to black stem rust incited by Puccinia
graminis var tritici (Pers.) Erikss&E.Henn. was investigated during late
epiphytotic form in milky stage of late maturing wheat cultivars (1st week of
May 2002) in Baghdad area where the early maturing cultivars successfully
escaped infection. High susceptible reaction was observed on cultivars sally,
Adnaniyia, Saberbeg, Hamra, Tamoze3, IPA99, EL-IEZ, Babil and strain IR722. The
cultivars AL-Qaied, AL-Noor, IPA95 and strain R24showed susceptible to
moderately susceptible reaction with 10-20% disease severity, affected by the
early maturity of these cultivars. In spite of late maturity of Al-Hashimiyia
cultivar, resistant reaction was observed on the plants. The first symptom of
black stem rust was developed on strain IR722. This strain however, is highly
susceptible to both leaf and yellow rust and is always used as a spreader of
inoculum in Tuwaitha Experimental station where this investigation was carried
out.
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