Lactuca

From Wikibooks, open books for an open world
< Horticulture
Jump to: navigation, search
Lactuca

Lettuces
Lactucaserriola2web.jpg
Genus: Lactuca
Family: Asteraceae
Type: Annuals, Perennials, Biennials
Weediness: Most species are weedy
Pollination: Insect

Lactuca, commonly known as lettuce, is a genus of flowering plants in the Sunflower family Asteraceae. The genus includes about 100 species, distributed worldwide, but mainly in temperate Eurasia.

Description[edit]

Its best-known representative is the garden lettuce (Lactuca sativa), with its many varieties. But many are just common weeds. They are annuals or perennials. Their height can vary between 10-180 cm. They form heads or capitula in panicles of yellow, brown or purple flowers in ray florets.

The non-edible species may contain bitter elements. Others contain a milky juice.

Growing conditions[edit]

Species[edit]

Uses[edit]

The garden lettuce is grown as a salad green, other species occur as weeds.

Pests and Diseases[edit]

Pests[edit]

Aphids

Hoppers

Whiteflies

Bugs

Thrips

Flies

Beetles

Flea Beetles

Caterpillars

Slugs and Snails

Diseases[edit]

Bottom Rot

Downy Mildew

Gray Mold

White Mold

Other Problems[edit]

Calcium Deficiency

References[edit]

  • Ann Fowler Rhoads and Timothy A. Block (2000). The Plants of Pennsylvania: An Illustrated Manual. Anna Anisko, illustrator. Morris Arboretum, University of Pennsylvania Press. pp. 225-227. 
  • Staff of the L. H. Bailey Hortorium (1976). Hortus Third: A Concise Dictionary of Plants Cultivated in the United States and Canada. Cornell University Press. pp. 631. 
  • Cranshaw, Whitney (2004). Garden Insects of North America: The Ultimate Guide to Backyard Bugs. Princeton University Press. pp. 602. 
  • Pippa Greenwood, Andrew Halstead, A.R. Chase, Daniel Gilrein (2000). American Horticultural Society Pests & Diseases: The Complete Guide to Preventing, Identifying, and Treating Plant Problems (First Edition ed.). Dorling Kindersley (DK) Publishing, inc.. pp. 202.