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Lettuce
> Year-Round IPM Program > Perennial
Weeds (Central Valley)
Lettuce
Perennial Weeds—Central Valley
See also, perennial weeds
of other regions: Central
Coast and Desert.
Use the photos below to identify weeds in the field. Names
link to more information on identification and biology.
Click on photos to enlarge
Bermudagrass
(Cynodon dactylon): Grass family; perennial; first leaves
with somewhat rough surface; ligule surrounded by ring of hairs
with tuft of long hairs on either side; auricles absent; stem
flat, wiry, and without hairs. |
Johnsongrass
(Sorghum halepense): Grass family; perennial; persists and spreads via
underground stems (rhizomes), which are thick, fleshy, and segmented; roots and
shoots can rise from each rhizome segment; leaves have a prominent whitish midvein. |
(Seedlings rarely occur, most plants grow from rhizomes and/or tubers)
Purple nutsedge
(Cyperus
rotundus ): Sedge family; perennial; (young plant) young shoot is
somewhat stiff, upright, and light green with a fairly prominent
whitish midvein; no auricle or ligule; triangular stem solid
or pithy and rarely hollow as in grasses. Seedling 2 to
3 newly emerged leaves with smooth, membranous, linear blades
folded lengthwise; sheaths tubular. |
Yellow nutsedge
(Cyperus esculentus): Sedge family; perennial; grasslike; light green
blades, flat, slender; leaf tip long and drawn out; nutlets globe shaped, smooth,
and almond flavored. |
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