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Germination and Growth of Leafflower (Phyllanthus urinaria) as Affected by Cultural Conditions and Herbicides

  • Glenn R. Wehtje (a1), Charles H. Gilliam (a2) and Jesse A. Reeder (a2)

Factors affecting the germination and seedling growth of leafflower were evaluated. Germination required exposure to light. Seeds covered with a 1-cm deep layer of pine bark mulch failed to emerge. Maximum seedling development occurred in full exposure to sunlight; shading that reduced light intensity more than 26% was inhibitory. Maximum seed germination (79%) occurred between 25 and 35 C; temperatures outside this range were inhibitory. Germination was strongly influenced by osmotic potential. Osmotic potentials of 0, 304, and 507 kPa resulted in 85, 24 and 14% germination, respectively. PRE applications of either granular formulated oxadiazon at 4.5 kg ha–1, or premixed granular formulated oxyfluorfen + oryzalin at 4.6 + 2.3 kg ha–1, provided a minimum of 85% control. The following POST treatments provided a minimum of 90% control of mature plants: paraquat at 0.21 kg ha–1, glyphosate at 0.56 kg ha–1, oxyfluorfen at 1.12 kg ha–1, and acifluorfen at 2.24 kg ha–1.

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1. Anderson, R. N. 1968. Germination and Establishment of Weeds for Experimental Purposes. Weed Sci. Soc. Am., 309 W. Clark St., Champaign, IL 61820.
2. Correll, D. S., and Johnston, M. C. 1970. Manual of Vascular Plants of Texas. Texas Research Foundation, Renner, Tex. p. 925928.
3. Elmore, C. D. Chairman. 1990. Weed Identification Guide, Vol. 5. Published by Southern Weed Science Society. 309 W. Clark St., Champaign, IL 61820.
4. Parmer, M. T., and Moore, R. P. 1966. Effect of simulated drought by polyethylene glycol solutions on corn (Zea mays L.) germination and seedling development. Agron. J. 58:391392.
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Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
  • URL: /core/journals/weed-technology
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