turf species. turf the on depending herbicides and phosphorus, reducing and nitrogen increasing pulling, by hand Control have burs. not does but looking similar is medic Black smooth. or spiny be can burclover on Burs Annual. medic Burclover days. humid cool, on fungus like white look Flowers species. turf on the depending herbicides postemergent some use Can renovate. to means mechanical or herbicide anonselective use Can rhizomes. and stolons, by seeds, weather. Spreads warm in Grows Perennial. Kikuyugrass point. one at meets (left) head seed Note species. turf on the depending herbicides postemergent some use Can renovate. to means mechanical or herbicide anonselective use Can rhizomes. and stolons, by seeds, weather. Spreads warm in Grows Perennial. Bermudagrass species. turf the for safe are they make sure but herbicides, water. postemergent Use or air with mowers Clean (right) mowers. to stick pods from expelled Seeds flowers. on yellow petals five and leaflets heart-shaped clover, with has but confused Often leaves. purple has year-round. Sometimes Found woodsorrel Oxalis, below. bermudagrass to Compare places. different (right) from out come heads seed Note February. in herbicide preemergent a Apply overseeding. and leaks for check irrigation; by reducing Control weed. annual Spring/summer Crabgrass Guide toCommonWeedsinLawnsCalifornia (right) (left),

black black

continued on the next page ... Guide to Common in Lawns in California

Yellow nutsedge Perennial. Sprouts from tubers in spring; dies back in late fall. Flowers are green- yellow. Produces numerous tubers. Often introduced in contaminated topsoil or fill. Hand pull frequently, dig up small sections at least 10 inches deep, modify irrigation and drainage, and apply postemergent herbicides before the 5-leaf stage. ... continued from the previous page page previous the from ... continued

Purple nutsedge Perennial that sprouts from tubers in spring and dies back in late fall. Generally found in warmer locations. Produces numerous tubers. Tubers often found in chains (right). Flowers are reddish brown. Often introduced in contaminated topsoil or fill. Hand pull frequently, dig up small sections at least 10 inches deep, modify irrigation and drainage, and apply postemergent herbicides before the 5-leaf stage. Download a copy of this guide in Spanish as well as a copy of the Guide to Annual bluegrass Common Turfgrass, also Cool weather annual. in both English and Span- Shallow roots with tuft- For ish, from the UC IPM Green like growth. Spreads by additional Bulletin Web page, http:// seeds, which are produced information on www.ipm.ucdavis.edu/ very quickly. Grows best in weed identification, greenbulletin/. moist areas. Hand pull and visit the UC IPM weed modify irrigation. Must apply photo gallery at http:// premergent herbicides by www.ipm.ucdavis.edu/ early September. Difficult to PMG/weeds_intro. control with postemergent html. herbicides.

Developed by Cheryl Wilen, UC IPM South Coast Area Advisor, and Mary Bianchi, Horticulture Farm Advisor, UC Cooperative Extension, San Luis Obispo County.