Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., Kratsch, H., Moe, A., Schultz, B. 2021, Nevada Noxious Weed Field Guide – Mayweed chamomile, Extension, University of Nevada, Reno, Field Guide

Stem

0.5-2 ft. tall, highly branched and bushy

Leaves

Alternate, finely and deeply divided, up to 2.5 inches long and sometimes hairy

Flower

Daisy-like; 0.5-1 in. diameter; yellow center with 10-15 white petals

Root

Short, thick taproot

Other

Grows best on disturbed sites; often infests roadsides, waste areas, landscaped areas and crop fields; known to occur in Carson City, Douglas, Lyon and Washoe counties
Annual; reproduces by seed
Foliage has a foul odor when crushed; reported to irritate the skin of livestock and change the milk flavor of lactating animals
Also known as dog fennel

Control

Cultivation or mowing prior to seed set can be effective
Apply clopyralid, dicamba, metsulfuron, picloram or tribenuron to actively growing plants

Learn more about the author(s)

Megan Andrews

Wendy Hanson Mazet

Heidi Kratsch

Also of Interest:


A Northern Nevada Homeowner's Guide to Identifying and Managing: Carpenter Ants Carpenter ants are some of the largest ants found in the United States. They are capable of damaging compromised wood in buildings and are there for important to identify and monitor quickly. Andrews, M., Hanson Mazet, W., and Kratsch, H. 2023, Extension, University of Nevada, Reno, FS-23-30
A Northern Nevada Homeowner's Guide to Identifying and Managing: Harvester Ants Harvester ants have large ant hill that are capable of reaching 12 feet in diameter and 3 feet deep. Harvester ants only become aggressive when disturbed and are capable of stinking. They do no invade homes, but are pests of lawns and gardens. Andrews, M., Hanson Mazet, W., and Kratsch, H. 2023, Extension, University of Nevada, Reno, FS-23-32

Nevada Noxious Weed Field Guide – Mayweed chamomile