Occurrence, Severity and Initiation of Internal Necrosis in ‘Covington’ Sweetpotato

Author:

Jiang Chen1,Perkins-Veazie Penelope1,Blankenship Sylvia M.1,Boyette Michael D.2,Pesic-VanEsbroeck Zvezdana3,Jennings Katherine M.1,Schultheis Jonathan R.1

Affiliation:

1. 1Department of Horticultural Science, North Carolina State University, Box 7609, 2721 Founders Drive, Raleigh, NC 27695

2. 2Department of Biological & Agricultural Engineering, North Carolina State University, Box 7625, D.S. Weaver Labs, Raleigh, NC 27695

3. 3Department of Plant Pathology, North Carolina State University, 3709 Hillsborough Street, Raleigh, NC 27695

Abstract

A series of studies were conducted to better understand the occurrence and causes of internal necrosis (IN) in ‘Covington’ sweetpotato (Ipomoea batatas). Assessment of the problem among the industry was done for 2 years and revealed that IN was widespread in commercial storage facilities throughout the state of North Carolina; both incidence and severity were generally low (<10% incidence with minimal severity of symptoms). A few storage rooms had a high percentage of IN with severe storage root symptoms but results were inconsistent across years and among rooms. Preharvest studies with commercially used insecticides did not induce IN, but the harvest aid ethephon consistently induced IN with an incidence higher than 50%. Internal necrosis symptoms were not detectable at harvest, and earliest consistent incidence was observed 6 days after harvest (DAH) during the curing phase. Symptoms became more prevalent and severe at 30 DAH. However, in commercial storage rooms, no relationship was found between IN incidence and postcuring storage temperature or relative humidity (RH) conditions. Sweetpotato storage roots stored in air-tight barrels and exposed to 100 ppm ethylene after curing showed no relationship between the presence of ethylene gas in storage and incidence of IN. Our results indicate that IN incidence of ‘Covington’ is erratic with no obvious cause among storage rooms and that initiation of IN may occur most frequently during the first week following harvest.

Publisher

American Society for Horticultural Science

Subject

Horticulture

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