Type of Document Dissertation Author Griffin, Roy Matthew URN etd-03212006-164209 Title Echinochloa polystachya Management in Louisiana Rice Degree Doctor of Philosophy (Ph.D.) Department Agronomy & Environmental Management Advisory Committee
Advisor Name Title Eric Webster Committee Chair James Griffin Committee Member Michael Wascom Committee Member Steven Kelly Committee Member Steven Linscombe Committee Member Charles Sasser Dean's Representative Keywords
- perennial grass
- echinochloa polystachya
Date of Defense 2006-03-17 Availability unrestricted AbstractE. polystachya introduced at stand densities (SD) of 10,000 through 70,000 stolon segments/ha produced 5.4 to 6 stolons/introduced segment; however, 130,000 through 520,000 SD produced 1.4 to 2.1 stolons per introduced segment indicating increased intra- and inter-specific competition. Stolon production was greater than 160,000 plants/ha with 30,000 through 520,000 SD. The 520,000 SD produced a total stolon length of 318 km/ha and no difference was observed for the 260,000 SD. Total node production was 290,000 nodes/ha with an average of 29 nodes/introduced segment in the 10,000 SD and 5.4 to 9.8 nodes/introduced segment with 70,000 or greater SD indicating greater inter- and intra-specific competition. Total biomass indicated similar trends with increasing densities.
In a depth of emergence study, E. polystachya shoot emergence was 31, 63, and 44% for stolons planted at the 0, 1.3, and 2.5 cm depth, respectively. Shoot emergence was 25% for 5 cm depth, which was similar to the 0 and 2.5 cm depth.
In a greenhouse study, glyphosate controlled E. polystachya 91% and control was 65 to 78% for all herbicides evaluated. When treated with glyphosate, biomass production was 19% of the nontreated E. polystachya.
Two studies evaluated herbicides labeled for Echinochloa crus-galli (L.) Beauv. control in rice for activity on E. polystachya. The first study included: 448 g/ha clomazone PRE, 448 g/ha clomazone plus 420 g ai/ha quinclorac delayed PRE, 448 g ai/ha pendimethalin plus 420 g/ha quinclorac DPRE, 70 g/ha imazethapyr at EPOST, and 175 g ai/ha mesotrione PRE. Each PRE herbicide was followed by 315 g/ha cyhalofop POST. The second study included: 208 g ai/ha cyhalofop EPOST fb 315 g/ha cyhalofop LPOST, 22 g ai/ha bispyribac EPOST fb 22 g/ha bispyribac LPOST, 66 g ai/ha fenoxaprop EPOST fb 86 g/ha fenoxaprop LPOST, 70 g ai/ha imazethapyr EPOST fb 70 g/ha imazethapyr LPOST and 50 g ai/ha penoxsulam MPOST. Each POST program was assessed with and without 448 g ai/ha clomazone PRE. In the first study, clomazone, imazethapyr, and pendimethalin plus quinclorac controlled E. polystachya 78 to 80%. In the second study, treatments including cyhalofop, imazethapyr, and penoxsulam controlled E. polystachya 76 to 84%.
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