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Inoculum density (propagules per gram of soil) of Verticillium dahliae at planting time, when plotted against the disease incidence (percent foliar symptoms) for two cotton cultivars for three successive years, closely followed the negative exponential curve Y=57.09 * (1-e -0.351*χ ). Correlation coefficients for each of the 3 yr separately and all 3 yr cumulatively were 0.71, 0.96, 0.84, and 0.85, respectively []
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Epaminondas J. Paplomatas (1992) studied this question.
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