The leaves of oak leaf lettuce can grow in both small and large sizes.
[53] Salmonella bacteria, including the uncommon Salmonella braenderup type, have also caused outbreaks traced to contaminated lettuce.
By the late 1900s, Asia, South America, Australia and Africa became more substantial markets. 1. Table of Contents. [42], Lettuce also suffers from several viral diseases, including big vein, which causes yellow, distorted leaves, and mosaic virus, which is spread by aphids and causes stunted plant growth and deformed leaves.
integrata and L. scariola var.
[54] Viruses, including hepatitis A, calicivirus and a Norwalk-like strain, have been found in lettuce.
Documentation from the late 19th century shows between 65 and 140 distinct varieties of lettuce, depending on the amount of variation allowed between types – a distinct difference from the 1,100 named lettuce varieties on the market at the time.
The cultivated variety appears to have been about 75 cm (30 in) tall and resembled a large version of the modern romaine lettuce.
The plant was thought to help the god "perform the sexual act untiringly. It can be plagued by numerous nutrient deficiencies, as well as insect and mammal pests, and fungal and bacterial diseases. Red leaf lettuce produces brilliant leaves ranging from deep royal purple to crimson and rust. Lettuce's native range spreads from the Mediterranean to Siberia, although it has been transported to almost all areas of the world.Plants generally have a height and spread of 15 to 30 cm (6 to 12 in). Outbreaks Associated with Fresh and Fresh-Cut Produce. Lettuce flowers more quickly in hot temperatures, while freezing temperatures cause slower growth and sometimes damage to outer leaves. There are also a few varieties with yellow, gold or blue-teal leaves. Romaine lettuce is often used for Caesar salads.
Lettuce has mild narcotic properties; it was called "sleepwort" by the Anglo-Saxons because of this attribute, although the cultivated L. sativa has lower levels of the narcotic than its wild cousins. For example, ancient Egyptians thought lettuce to be a symbol of sexual prowess[45] and a promoter of love and childbearing in women. [13], Lettuce's native range spreads from the Mediterranean to Siberia, although it has been transported to almost all areas of the world. Choose the right type depending on the season—varied.
In 1586, Joachim Camerarius provided descriptions of the three basic modern lettuces – head lettuce, loose-leaf lettuce, and romaine (or cos) lettuce.