CHANGES IN THE SPORE POPULATION OF COCHLIOBOLUS SATIVUS IN SASKATCHEWAN WHEAT FIELDS

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Abstract
Spore population of Cochliobolus sativus in 25 fields seeded to wheat and 23 fields under fallow were observed at intervals in 1960 and once in April 1961. In the seeded fields the spore population decreased slightly from April to July and, with two exceptions, increased sharply about August 12 when the crop was nearly ripe. The populations of most of these fields reached their maximum at this time; they ranged from 36 to 1190 and averaged 275 viable spores per gram of soil. The counts dropped to 209 in October and 145 in April 1961. Spore populations declined under summerfallow but not to the point of extinction. In representative fields the population decreased from an average of 70 spores per gram of soil in May 1960 to 52 in October, and then to 36 in April 1961. However, in three non-representative fields, where an unusually large number of volunteer wheat plants were present, the population increased as in the seeded fields.

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