Identification of preharvest desiccants for use in onion production

Identification of preharvest desiccants for use in onion production

Dry bulb onion (Allium cepa) leaves may not dry down normally and bulbs may not attain dormancy during adverse growing seasons. An effective method of artificial leaf desiccation is needed to complement mechanical harvesting and onion conditioning for storage. Desiccants were tested in 1993, 1994, 1...

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Bibliographic Details
Published in:HortTechnology (Alexandria, Va.) Vol. 15; no. 4; pp. 808 - 811
Main Authors: Arboleya, J.E, Masabni, J.G, Particka, M.G, Zandstra, B.H
Format: Journal Article
Language:English
Published: 01-10-2005
Subjects:
Allium cepa
crop management
crop quality
desiccants
dormancy
field experimentation
leaves
mechanical harvesting
onions
plant cultural practices
postharvest diseases
senescence
Michigan
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Summary:Dry bulb onion (Allium cepa) leaves may not dry down normally and bulbs may not attain dormancy during adverse growing seasons. An effective method of artificial leaf desiccation is needed to complement mechanical harvesting and onion conditioning for storage. Desiccants were tested in 1993, 1994, 1995, 2001, 2002, 2003 on onion leaves prior to harvest, and bulb quality was evaluated after 5 months or more of storage. Carfentrazone, diquat, and paraquat desiccated onion foliage well but increased bulb rot and reduced the percentage of marketable bulbs after storage. Bromoxynil and endothall desiccated onion foliage significantly without inducing rot or reducing the percentage of marketable bulbs. Copper sulfate and pelargonic acid increased desiccation of onion foliage but were not sufficiently effective for field use. Neither reduced the percentage of marketable bulbs. If bromoxynil or endothall were labelled for onion desiccation, they could be applied 10-14 days before harvest to enhance natural leaf senescence and facilitate mechanical harvest.
ISSN:1063-0198
1943-7714
DOI:10.21273/HORTTECH.15.4.0808