An epiphytotic of blast occurred in the Iowa oat crop in 1957. The blasting was atypical in that the panicles were stratified with all of the spikelets in a section being blasted. Normally blasting occurs in the spikelets near the base of the panicle and the central axis. The environmental condition which appeared to be the most likely cause of the blasting was a cold, cloudy period between May 10 and 27. This was during early spikelet development and panicle elongation. Severity of atypical blasting was associated with earliness and lateness in the oat varieties. The highest percentage of panicles with atypical blast and the highest percentage of blast on these panicles occurred in varieties which beaded on June 13 and 14. Seeds from heads with atypical blast were from 10 to 25 per cent heavier than those from normal heads. The yield losses caused by atypical blast ranged from 7 to 15 per cent depending upon the maturity of the varieties.
Proceedings of the Iowa Academy of Science
© Copyright 1959 by the Iowa Academy of Science, Inc.
Frey, K. J. and Browning, J. A.
"Yield Losses from Atypical Oat Blast in Central Iowa in 1957,"
Proceedings of the Iowa Academy of Science: Vol. 66:
, Article 16.
Available at: https://scholarworks.uni.edu/pias/vol66/iss1/16