Date of Award:

5-1949

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Agronomy

Committee Chair(s)

Rollo W. Woodward

Committee

Rollo W. Woodward

Committee

D. W. Thorne

Committee

E. L. Waldee

Abstract

Wheat is an important food crop of the world, especially in Soviet Russia, U.S.A., China, India and Pakistan. Over one billion bushels of wheat are produced annually in U.S.A. The total area under wheat production in Pakistan during 1947-48 was 10 million acres with an average yield of 12 bushels per acre.

The stem rust disease has been known for along time to be destructive to grain crops, even centuries before the Christian era. Rust is of major importance in both the U.S. and Pakistan. Jethro Tull recorded rust in England in 1725. In 1916, rust was serious over the entire world. Since 1900 there have been eight epidemic rust years when losses were estimated as much as 160 million bushels per year. The heaviest losses are in the humid hard red winter and hard red spring wheat areas.

Three methods of control are generally practiced for black stem rust of wheat. They are breeding resistant varieties barberry eradication and sulphur dusting. Of these, resistant varieties appear to be the most effective in the control of this disease.

The problem discussed in this paper involves the breeding and selection of rust-resistant spring wheat strains.

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