PDF 24 pages 11 species 21 images Includes weed control and prevention guidelines for several types of weeds. Weeds in Irrigated Pasture - by UC Extension
Baltic Rush
Cool Season
Perennial
Reproduces from seed & rhizomes
Induced by wet and overgrazed conditions-indicates a disturbed site
Occurs in soils that are not adequately drained
Forage value is low
Italian Thistle
Annual or Biennial
Reproduce from seeds which can remain viable for eight years
Found on road sides pasture and waste areas
Induced by open space where seedlings have the opportunity to thrive
Bull Thistle
Biennial
Chokes out desirable forages
Encouraged by overgrazed or barren land
Grows from one to six feet Highly competitive
Henbit / Dead Nettle / Mint
Annual, biennial, short-lived perennial
Rarely grows over 12 inches
Has square stems
Cool season weed
Induced by poor drainage and irrigation
Pigeon Grass / Green Foxtail / Wild Millet
Annual
Tolerates dry/moist/acidic and neutral soils
Cannot grow is shade
Requires well drained soils
Although Palatable before heading out, yield is greatly reduced
Sour / Curly Dock
Perennial
Known to produce oxalates which can poison cattle
Commonly associated with over watering or weed infested irrigation ditches
Velvetgrass
Perennial grass
Grows from 1-2.5 feet tall
Vigorous seedlings choke out more desirable grasses
Induced by barren lands
Underground rhizomes make control difficult
Smut Grass
Warm season perennial
Normally unpalatable and grazing encourages the spread of seed
Two species-1 is smaller and narrower
Name comes from smut fungus which inhabits the plant in the humid south where it has been an ongoing problematic weed.
Johnson Grass
Perennial
Reproduces from seeds and rhizomes
Can cause nitrate and prussic acid poisoning if fed after stress from drought or frost
Barnyard Grass
Summer Annual
Can survive drought and flourish when moisture is present
Grows from 6 inches to 6 feet
1 plant produces 40,000 seeds
Conflicts with cool season irrigated pasture forages
Spiny Cocklebur
Annual
Difference between Spiny cocklebur (left) and the poisonous common cocklebur (below) is the lack of spines on common cocklebur
The burs of each catch in the wool and tails of livestock
Inhabits dry areas
References
?
Forero, Reed, NRP-1193 (1993) Irrigated Pasture Production in the Sacramento Valley
?
Baumann, Paul A., B-5038 (2004) Suggestions for Weed Control in Pasture and Forages
?
DiTomaso, Joseph M., (1996) Yellow Starthistle: Chemical Control
?
DiTomaso, Joseph M.,Principles of Weed Control Third Edition, Irrigated Pastures pgs 329-336
?
University of California ANR, 4030-I, Growers Weed Identification Handbook
?
Whitson, Burrill, Dewey, Cudney, Nelson, Lee, Parker,(2002) Weeds of the West 9th Edition
?
CalPhotos: Plants website University of California, Berkeley http://elib.cs.berkeley.edu/photos/flora/
Regions Impacted: (See related documents in region)
USA,
Pacific,
Southwest
After placing this free order, please wait a few hours to receive your email notice of approval. You will need your login email address and password to review your order and download this item.
More Weed ID resources from
Ergonica Partners>
This product was added to our catalog on Monday April 15, 2013.