Abstract
Relationships between crop losses in flue-cured tobacco (Nicotiana tabacum) and the distribution of plant mortality due to black shank, caused by Phytophthora parasitica var. nicotianae race 0, or injection of glyphosate were investigated in Virginia during 1986-1987. The number of plants compensating for the yield of adjacent dead plants decreased as plant mortality became increasingly clustered. Plot yield and gross economic returns increased linearly with the number of compensating plants per plot. In 1986, relationships between plant mortality distribution and plot yield or gross economic returns were unaffected by cause of death (P. p. nicotianae vs. a 41% solution of glyphosate) or inoculation date (4 vs. 6 wk after transplanting) (.)
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