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.
Full Article Available as PDF only - Use Download Feature
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