Effect of Cultivar Selection on Soil Population of Verticillium dahliae and Wilt Development in Cotton
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A microplot study was conducted over a 3-year period to investigate the influence of planting combinations of susceptible and/or partially resistant cotton cultivars on soil population of Verticillium dahliae. Stoneville (ST) 4554B2RF was used throughout the test as a susceptible cultivar and either Associated Farming Delinting (AFD) 5065B2F or an advanced breeding line was used as a partially resistant cultivar. Microplots were augmented with field soil naturally infested with V. dahliae. ST 4554B2RF when planted in three sequential seasons increased V. dahliae population in soil by 754 fold; however, V. dahliae population in microplots planted to the partially resistant cultivars over three seasons increased by 114 fold. Disease incidence increased from 8% to 58% over 3 years for ST 4554B2RF and from 0% to 5% for AFD 5065B2F or advanced breeding line over the same period. Yield was highest after 3 years of AFD 5065B2F or the advanced breeding line and lowest after 3 years of ST 4554B2RF. Yield correlated with the current year cultivar, pre-plant V. dahliae densities, and disease incidence. Results from this study indicate that cultivar selection can impact microsclerotia density and incidence of wilt in cotton. Accepted for publication 26 June 2012. Published 24 August 2012.
