Stemless Four-nerved Daisy

Stemless Four-nerved Daisy (Latin: Tetraneuris scaposa) is a perennial herbaceous weed belonging to the Asteraceae family. It is typically found in arid and semi-arid regions, colonizing pastures, rangelands, and encroaching upon disturbed agricultural sites where it acts as a persistent competitor for soil moisture and nutrients.

Botanically, the plant is characterized by a basal rosette of narrow, hairy leaves and naked flowering stalks that bear solitary, yellow daisy-like flowers. Its root system is deeply seated, enabling the plant to endure long periods of drought and recover vigorously from moderate environmental stressors, which makes it a persistent nuisance in field crops.

The weed’s primary harm lies in its aggressive resource competition. By tapping into subsoil water reserves, it effectively starves neighboring crops of essential moisture. Its presence is particularly detrimental in dryland farming systems, where crop yields are directly correlated with the availability of subsurface water.

Effective management begins with mechanical interventions. Deep tillage is highly recommended to sever the established taproots of the plants. In addition to tillage, implementing competitive cropping strategies—such as planting dense cover crops—helps shade out the rosettes and suppresses the establishment of new seedlings in the field.

Chemical control focuses on the use of systemic herbicides. Best results are achieved during the active growth phase in early spring, as translocation of the active ingredient to the root system is most efficient at this time. Selective herbicide applications targeting broadleaf weeds can significantly reduce population density without harming primary grass crops.