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Document Type

Research

Abstract

Crown rust is the most destructive disease of oats in Iowa. Losses during the 1930's and early 40's ran high; 30 per cent in 1941. From 1944 to 1948 very little rust occurred, but from 1949 to 1952, loss estimates averaged $45,000,000 per year. The role of buckthorn (Rhammus cathartica L.) as the alternate host of the crown rust pathogen (Puccinia coronata Corda) was discovered by De Bary in 1866. More recent research has shown all species of Rhamnus susceptible to one or more varieties of this leaf rust producing fungus. Occurring in hedges and as escaped bushes in fence rows, R. cathartica constitutes a two-way threat to the oat crop; aeciospores blown from infected buckthorn leaves cause early spring infection of oat fields when weather conditions are favorable; and, new races capable of attacking previously resistant varieties may be formed since hybridization of the fungus occurs each year on the buckthorn leaves.

Publication Date

1954

Journal Title

Proceedings of the Iowa Academy of Science

Volume

60

Issue

1

First Page

95

Last Page

97

Copyright

© Copyright 1953 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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