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Tipburn of romaine lettuce is a serious quality defect, which causes significant economic loss to lettuce growers in the Salinas Valley of California. This defect is particularly problematic for the producers of fresh-cut salad mixes because the

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.S. lettuce crop is grown in California and Arizona, but according to the 2012 Census of Agriculture, lettuce was planted on ≈3500 acres in the northeastern U.S. romaine, and leaf lettuces account for 52% of production nationally and 83% of production in the

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morphological type until the 1990s, but then the popularity of romaine lettuce in the market changed this situation ( Hayes 2018a ). Currently, head lettuce (including iceberg and butterhead types) account for 39% of the total area planted; romaine lettuce alone

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, Fairfield, ME, USA) and Tropicana (Johnny’s Selected Seeds); and two romaine cultivars, Parris Island Cos (Baker Creek Heirloom Seed Co., Mansfield, MO, USA) and Sparx (Johnny’s Selected Seeds). These cultivars were grown at the Jose Fernandez Garden at the

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, and loss of crispness in fresh-cut Romaine lettuce ( Manolopoulou et al., 2010 ). For subjective ratings, numerical or descriptive thresholds are set, typically using hedonic scales with ratings from 1 (extremely poor quality) to 9 (excellent quality

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Romaine lettuce ( Lactuca sativa ) is one of the most important fresh market vegetable crops in the United States. The annual lettuce consumption in 2017 was 24.5 lb per person, of which 45% (11 lb per person) were romaine and leaf lettuce. Ninety

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in the last 2 to 3 years, little research has been conducted on the performance of these automated thinners. Plant spacing affects lettuce yield and quality significantly ( Maboko and Du Plooy, 2009 ; Ririe, 1972 ). In both iceberg and romaine

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the effect of water quality and the product-to-water ratio on the quality and microbial growth of packaged sliced Romaine lettuce. Materials and Methods Plant material. Romaine lettuce ( Lactuca sativa L.) was purchased from a produce

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income. Romaine type lettuce is the main lettuce grown by small to medium producers. Depending on plant spacing, the average yields of romaine lettuce can be around 30,000 kg·ha −1 ( Mossler and Dunn, 2005 ). Romaine type lettuce is a preferred leafy

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Abstract

Cos (romaine) lettuce (Lactuca sativa L.) accounted for less than 5% of California lettuce production in 19783. Cos lettuce adds color, flavor, and texture to tossed (chopped) lettuce salads. In addition, cos lettuce is more nutritious than crisphead lettuce (1).

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