Glossary of Terms
L
late blight (potato/tomato)
A devastating disease caused by Phytophthora infestans, leading to dark lesions and rapid plant collapse. Learn more.
lawn aerator
A device used to perforate the soil with small holes to allow air, water, and nutrients to reach roots. Learn more.
layering
A propagation method where a stem forms roots while still attached to the parent plant. Learn more.
leachate
Liquid that drains through soil or compost, carrying dissolved materials, nutrients, or pollutants. Learn more.
leaching zone
The upper layer of soil where minerals and nutrients are dissolved and carried downward by water. Learn more.
leaf blight
Rapid browning and death of leaf tissue caused by fungi, bacteria, or environmental stress. Learn more.
leaf miner
The larva of various insects that tunnels between leaf layers, creating visible trails. Learn more.
leaf mold
A fungal disease or composted leaf product; in tomatoes, it refers to Passalora fulva infection. Learn more.
leaf roll virus
Viral diseases of crops like potatoes and grapes that cause upward leaf curling and yield loss. Learn more.
leaf spot
Circular necrotic lesions on leaves caused by fungi or bacteria, often surrounded by yellow halos. Learn more.
leafminer
insect larvae that live between leaf surfaces, feeding on internal tissues and creating tunnels or blotches. Learn more.
legume
A pod-type fruit characteristic of the pea family that splits open along two seams. Learn more.
light intensity
The amount of light energy received per unit area, influencing photosynthesis and plant growth rate. Learn more.
lime (agricultural)
Calcium-containing materials applied to raise soil pH and reduce acidity. Learn more.
living mulch
A low-growing ground cover planted under crops to suppress weeds and retain moisture. Learn more.
locule
A small cavity or compartment within an organ, such as the chambers of an ovary or anther. Learn more.
lodicule
Small scale-like organs at the base of the ovary in grass flowers that aid in flower opening. Learn more.
looper
a caterpillar that moves in looping motions due to missing middle legs, such as inchworms. Learn more.
lygus bug
A group of plant bugs (Lygus spp.) that feed on developing buds and fruit, causing deformation. Learn more.