Leaf spot

A spot, usually irregularly circular, and usually necrotic, caused by a pathogen. Leek

See: Allium ampeloprasum. Legume

A cultivated member of the botanical family Leguminoseae. Leguminoseae

Legumes which are cultivated for their seeds, such as peas, beans, lentils, peanuts, soybeans, and grams, are known as grain legumes or pulses. Those that are cultivated for grazing, or hay, in order to feed farm animals are known as fodder legumes, and include clovers, alfalfa (lucerne), vetches, sainfoin, etc. Most of the pulses are self-pollinating, while the fodder legumes are mainly cross-pollinating. Lemon

See: Citrus limon. Lens esculenta

The lentil. A self-pollinated member of the family Leguminoseae, this is one of the oldest pulses and it has been cultivated in the wheat and barley lands of the Old World since the beginnings of agriculture. Most cultivars are pure lines and there is room for recurrent mass selection by amateur breeders . In addition to improved horizontal resistance, there is a need for higher yields, suitability for mechanical harvesting, and a reduction of flatulence factors. Lentil

See: Lens esculenta. Lepidium sativum

Garden cress, cultivated as a salad plant, and served as young seedlings. Lepidoptera

The insect order that contains the butterflies and moths and is characterised by four large wings that are covered in scales. In the butterflies, the upper surfaces of the unfolded wings are usually brightly coloured sex attractants, while the lower surfaces of the wings have camouflage colours, which appear when the wings are folded together vertically. The moths fold their wings horizontally, and they then exhibit camouflage colours. Many of the early instars, known as caterpillars, or grubs, are serious crop pests. Most Lepidoptera are now rare because of the widespread use of insecticides.

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