Research on the ecology of peanut roots from fields in Georgia, Florida, and Alabama revealed a high frequency of sunken, dark cankers on the taproot which persisted to harvest. Isolations from these cankers resulted in recovery of Rhizoctonia solani anastomosis group 4 (AG-4) from more than 50% of the cankers. A survey of peanut fields being harvested during early September revealed that 28% of the fields had an average of more than 50% of the taproot surface area cankered. In contrast, for fields in the same area harvested one month later, 77% had disease severities of less than 25% and none were greater than 50%. In an experiment conducted in 1984, roots from 64 plots were examined and rated for root rot severity and yield. When taproot disease severity was regressed against yield, a highly significant negative correlation (r2 - 0.60, P<0.01) was found.
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Keywords: Arachis hypogaea, yield loss, Groundnut
How to Cite:
Turner, J. & Backman, P.,
(1988) “Severity, Distribution, and Losses from Taproot Cankers Caused by Rhizoctonia solani in Peanuts¹”,
Peanut Science 15(2),
01 Jul 1988