Epidemiology of Tilletia indica Teliospores in Regulated Wheat Fields in Texas

Plant Disease
J M SteinC M Rush

Abstract

To examine the epidemiology of Tilletia indica teliospores in naturally infested soils from wheat fields in both Karnal bunt-regulated regions in Texas, soil was grid sampled from fields that were bunted-kernel positive for Karnal bunt in 1997, 2001, both years, or never. Aliquots of soil from each point were pooled, and teliospores were extracted using a size-selective sieving-sucrose centrifugation method. Teliospores were enumerated microscopically, and low quantities (< 8 per 25 g of soil) were identified in 14 of 15 fields sampled from the regulated regions of Texas, including fields that have never tested positive for bunted kernels, indicating a widespread distribution. No teliospores were isolated from the single field examined outside of the regulated regions. The percent clay was significantly, negatively correlated with the baseline teliospore number and the estimated (extrapolated) number of teliospores per sample, indicating a potential impact of soil composition on teliospore survival. The latter factor was also significantly, positively correlated to the number of times a field had tested positive.

References

Oct 24, 2008·Phytopathology·K A Garrett, R L Bowden
Mar 1, 2005·Plant Disease·Charles M RushMatthew H Royer
Jan 1, 2004·Plant Disease·M BabadoostM R Bonde
Aug 1, 2004·Plant Disease·M R BondeD K Berner
Apr 1, 2004·Plant Disease·M R BondeT Sim
Dec 1, 1997·Plant Disease·Morris R BondeJoseph L Smilanick

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