Journal
HORTTECHNOLOGY
Volume 23, Issue 3, Pages 288-293Publisher
AMER SOC HORTICULTURAL SCIENCE
DOI: 10.21273/HORTTECH.23.3.288
Keywords
Ipomoea batatas; ethylene; devining; end rot
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Funding
- USDA-NIFA Specialty Crop Research Initiative [2009-51181-06071]
- Mississippi Sweet Potato Council
- NIFA [687681, 2009-51181-06071] Funding Source: Federal RePORTER
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Tip rot, or restricted end rot, is a new sweetpotato (Iporaoea batatas) disease/disorder in Mississippi with unknown etiology. Since pathogen isolations have been inconsistent, a relationship of this disorder with stress is proposed. This disease/disorder is manifested as a restricted lesion at or close to the proximal end of the storage root and appears after 2 to 4 weeks in storage. In many cases, the lesion necrosis expands internally. On-farm and research station studies with preharvest foliar applications of ethephon were conducted in Mississippi to determine the potential association of tip rot with ethephon-induced stress. In addition, the effects of ethephon rate and interval between application and harvest on tip rot were investigated. After 1 to 2 months in storage, tip rot incidence was observed mostly in storage roots from ethephon-treated plants. The increase in tip rot incidence was well correlated with ethephon rate. These results suggest that preharvest applications of ethephon trigger a response that results in the tip rot disorder.
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