The Control of Stem Rust in Wheat (Puccinia Graminis Var. Tritici) by Aerial Application of Fungicides

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Jones R. J.
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Black Stem Rust of wheat (Puccinia graminis var. triti .i) is acknowledged to be the major disease of wheat in Kenya. Its presence in wheat crops each year results in low yields and poor grade. It has been the object of plant breeders for the past half century in Kenya to produce wheats which are resistant to the disease and which also have good baking qualities. The breeding of such wheats has been a difficult task due to the "short circuit" in the life history of the fungus under Kenya conditions. Guthrie, 1959, has pointed out that the lack of a winter, together with a wide range of growing seasons in East Africa, makes it possible for the fungus to survive in the uredospore stage throughout the year. In addition, new strains of the fungus are constantly appearing either through mutation or by transport in the wind from other countries further north. This constant influx of new races is a curse to the plant breeder, each year many promising new "varieties" succumbing to the new and often more virulent strains of the fungus.
East African Agricultural And Forestry Journal, XXVI (No. 4), p. 210-218