leaf mold Decaying leaves often used as an amendment to soil.

leaf rake A long-handled tool with a fan-like piece attached for dragging leaves or such into piles. The fan shape is usually made of thin, flat, stiff, and bendable bamboo, metal, or plastic strips.

leaf rollers A moth (lepidopteran) having larvae that damage plants by rolling in a leaf to make a nest. It prefers oak or fruit trees. They have a number of insects that usually hunt them and keep populations down, but when found, remove the leaf and destroy it. If infestations are heavy, chemical sprays can effectively control them.

leaf scar The mark left on a branch, stem, twig, etc. when a petiole becomes detached and the leaf falls. It is very noticeable on some plants.

leaf scorch The partial or complete desiccation of a leaf due to lack of water supply to the leaf. This may be caused by lack of irrigation, frozen roots, damage to roots, drying winds, etc. Precautions can be taken by planting shade-loving plants in shade, using drought-tolerant plants in areas of heat or low irrigation, watering plants adequately, adding mulch around plants to prevent evaporation, and by controlling insects and diseases.

leaf skeletonizer Any caterpillar that eats the fleshy portion of leaves so that a skeleton-like leaf is left.

leaf spot See anthracnose.

leaf tiers A term given to caterpillars that feed on leaves and tie them together with silky threads.

lean concrete Any concrete with low cement content.

ledger In framing, a horizontal element of lumber supported by a post, wall, etc. and having joists attached to it.

ledger board A horizontal board joined by vertical supports, as in fence construction.

ledger strip A strip of wood nailed along the bottom of a beam to assist in supporting joists.

leggy Plants with stems unnaturally long from lack of light, high temperatures, excessive nitrogen, etc. Their lower areas usually have few leaves.

legume A family of plants with roots that contain nitrogen-fixing bacteria (e.g., rhizobium). This family includes some herbs, shrubs, and trees. Important food and forage plants belonging to this family include clovers, beans, and peas.

leguminous Pertaining to legumes.

lemma In a grass flower spikelet, the lower of two bracts enclosing the flower. It has its back at the outside of the spikelet.

paiea 1 stigma stamenX Jj / lodiculc 'Wy /

grass flower or spikelet lemma lens Glass or plastic enclosing the bulb of a luminaire, allowing light to be transmitted through it.

lentic Having to do with wetlands, ponds, or lakes that are not flowing waters.

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