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Lewis W. Jett

Skinning of sweetpotatoes [Ipomoea batatas (L.) Lam] can reduce marketable yield and quality. The `Beauregard' sweetpotato, despite its consistent high yield and quality, is very susceptible to skinning injury during harvest. A research project was initiated to investigate chemical and mechanical methods to improve skinset of `Beauregard' sweetpotato. Approximately 14 days before harvest, Desicate II and Enquik (dihydrogen tetraxosulfate) were applied to the sweetpotato vines as a broadcast spray. Mechanical methods evaluated included mowing with a flail-type mower or pulling (vine detachment) 7 days before harvest. Skin-set was measured using a Halderson periderm shear tester fitted to a torquometer. The Enquik + Desicate II treatment significantly desiccated the vines relative to application of Desicate II alone. The skin set testing device was sensitive enough to detect differences between treatments. The highest skin-set reading was obtained from the pulled vine treatment. Marketable yield was not affected by application of any chemical or mechanical treatment. Curing of skinned sweetpotatoes(4 days; 30 °C; 90% relative humidity) significantly reduced postharvest moisture loss and disease incidence.

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J. Harrison Ferebee IV, Charles W. Cahoon, Michael L. Flessner, David B. Langston, Ramon Arancibia, Thomas E. Hines, Hunter B. Blake and M. Carter Askew

( Kuhar et al., 2018 ). Vine desiccation before potato harvest is a common practice in the United States, giving producers the ability to regulate tuber growth and skin set, prevent spread of diseases, and facilitate more efficient harvest due to reduced

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Xiang Wang, Ramón A. Arancibia, Jeffrey L. Main, Mark W. Shankle and Don R. LaBonte

when compared with 1 DBH ( Fig. 1 ), which suggests that other factors may be involved in skin set (toughening and adhesion). High temperature and soil moisture have been reported to increase and reduce, respectively, skinning resistance in sweetpotato

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Alexander D. Pavlista

Chemical vine desiccation of potato (Solanum tuberosum L.) is widely used in the USA. Diquat is the major vine desiccant but has some drawbacks such as incomplete stem desiccation allowing regrowth. A new herbicide, UCC-C4243, was evaluated as a replacement for diquat. The potato cultivar `Atlantic' was treated with UCC-C4243 (a.i.) at 0.25 to 2.5 oz/acre (17.5 to 175 g·ha-1), and leaf and stem desiccation efficiency was compared to diquat (a.i.) at 4 oz/acre (280 g·ha-1). Split applications of UCC-C4243 were compared to double applications of diquat. Subjective evaluations were made on regrowth and tuber skinning, and objective measurements on specific gravity and yield. Trials were conducted from 1991 to 1995 at Scottsbluff, NE. UCC-C4243 at 1.5 oz/acre (105 g·ha-1) and higher significantly increased leaf and stem desiccation compared to diquat. There was no difference between single and split applications of UCC-C4243. UCC-C4243 suppressed regrowth at 1 oz/acre (70 g·ha-1) and prevented it at 2.5 oz/acre at 3 weeks after treatment while diquat did not. Skin set of tubers was promoted equally by all desiccants. Specific gravity was not lowered by UCC-C4243 but was by diquat. Yields were not affected by either UCC-C4243 at 1.5 oz/acre or diquat at 4 oz/acre. UCC-C4243 was more effective than diquat as a vine desiccant without the regrowth and tuber specific gravity effects associated with diquat.

Open access

-skinned Potatoes Chemical desiccation of potato vines prior to harvest improves skin set, regulates tuber size, and facilitates harvest. Diquat herbicide, the grower standard, can result in incomplete stem desiccation. Ferebee et al. (p. 643) evaluated diquat

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Mildred N. Makani, Steven A. Sargent, Lincoln Zotarelli, Donald J. Huber and Charles A. Sims

storability of tubers is harvest maturity, classified as physical, physiological, and chemical maturity ( Bussan, 2003 ). Tablestock potatoes reach harvest maturity when the tuber periderm adheres firmly to the underlying cell layers, the point known as skin-set

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Lucia E. Villavicencio, Sylvia M. Blankenship, G. Craig Yencho, Judith F. Thomas and C. David Raper

cells within the periderm (i.e., phellogen) would play an important part in tuber skin set and resistance to skinning. Curing probably increases the rate of water vapor loss from the periderm, hastening skin set. After curing, the degree of skinning

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were equally effective. Tuber skin set was promoted by all treatments. Specific gravity was not lowered by UCC-C4243 and yields were not affected IMPROVING GROWTH AND UNIFORMITY OF SWEETPOTATO PLANTLETS USING A FORCED VENTILATION

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Ramón A. Arancibia, Jeffrey L. Main and Christopher A. Clark

. There is also evidence that preharvest applications of ethephon and other defoliants used in potato ( Solanum tuberosum ) induce physiological changes in sweetpotato storage roots resulting in skin set and reduced skinning at harvest ( Schultheis et al