Spiraled heads in lettuce: Malformation in Great Lakes lettuce strains apparently an inherited character producing united wrapper leaf margins
AuthorF. W. Zink
Author AffiliationsF. W. Zink is Specialist in Vegetable Crops, University of California, Davis and Salinas.
Hilgardia 13(10):6-8. DOI:10.3733/ca.v013n10p6. October 1959.
Great Lakes lettuce, adapted to culture under a range of environmental conditions, normally produces a medium-large, globular, semi-exposed head. In some plantings, however, a percentage of the plant population develops conical-shaped heads, with the wrapper leaves or head leaves in a spiral-like fold. Market-stage plants of this type are generally referred to as spiraled heads. The shipper and retailer prefer a slightly oblate head with broad, flat butt, which can be packed evenly and firmly.
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