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Biology, ecology, and control of dov...

Atkinson, Jeffrey Lansing.

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Biology, ecology, and control of doveweed (Murdannia nudiflora[L.] Brenan).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Biology, ecology, and control of doveweed (Murdannia nudiflora[L.] Brenan)./
作者:	Atkinson, Jeffrey Lansing.
面頁冊數:	114 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-02(E), Section: B.
Contained By:	Dissertation Abstracts International76-02B(E).
標題:	Biology, Botany. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3636762
ISBN:	9781321186284

Biology, ecology, and control of doveweed (Murdannia nudiflora[L.] Brenan).
Atkinson, Jeffrey Lansing.

Biology, ecology, and control of doveweed (Murdannia nudiflora[L.] Brenan). - 114 p.

Source: Dissertation Abstracts International, Volume: 76-02(E), Section: B.

Thesis (Ph.D.)--Clemson University, 2014.

Doveweed (Murdannia nudiflora [L.] Brenan) is a summer annual in the Southeastern United States with an expanding geographic range. The light green color and texture of doveweed is problematic for turfgrass managers as it contrasts with the color and texture of desirable turfgrasses. Experiments were conducted to improve the understanding of how environmental conditions effect doveweed germination, how cultural practices and environmental resource availability effect doveweed growth and development, to identify pre- and postemergence herbicides with efficacy for doveweed control, and to improve the understanding of why poor control is observed with postemergence herbicides.

ISBN: 9781321186284Subjects--Topical Terms:

1017825
Biology, Botany.

Biology, ecology, and control of doveweed (Murdannia nudiflora[L.] Brenan).
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245 1 0 $a Biology, ecology, and control of doveweed (Murdannia nudiflora[L.] Brenan).
300 $a 114 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-02(E), Section: B.
500 $a Adviser: Lambert B. McCarty.
502 $a Thesis (Ph.D.)--Clemson University, 2014.
520 $a Doveweed (Murdannia nudiflora [L.] Brenan) is a summer annual in the Southeastern United States with an expanding geographic range. The light green color and texture of doveweed is problematic for turfgrass managers as it contrasts with the color and texture of desirable turfgrasses. Experiments were conducted to improve the understanding of how environmental conditions effect doveweed germination, how cultural practices and environmental resource availability effect doveweed growth and development, to identify pre- and postemergence herbicides with efficacy for doveweed control, and to improve the understanding of why poor control is observed with postemergence herbicides.
520 $a Doveweed germination was affected by scarification, osmotic potential and salt concentration. Mechanical abrasion of the seed coat increased germination to 84% compared to 18% in non-scarified seed. Germination was similar between osmotic potentials of 0 and -0.4 MPa and was reduced ~50% in a -0.8 MPa solution, suggesting doveweed favors a moist environment for germination. Germination was similar between NaCl concentrations of 0 and 40 mM, and reduced ~50% in a 160 mM NaCl solution, suggesting infestations can occur in moderately saline soils. Germination was not affected by nitrate concentration or pH.
520 $a Doveweed spread of established plants was between 30 and 46% less in response to low mowing after one study year; however, differences in doveweed spread were not detected after year two. The lack of mowing height effect was attributed to recruitment of doveweed seedlings from seeds produced at the end of year one. This result suggests doveweed infestations can rapidly increase in severity if left unchecked. When grown in competition with `Tifway' bermudagrass (Cynodon dactylon [L.] Pers x C. transvaalensis Burtt-Davy), doveweed coverage per plant was ~38% less when mown at 1.32 cm compared to mowing at 2.65 cm. In the same study, increasing nitrogen rate from 24.5 to 49 kg N ha-1 increased doveweed spread per plant 75%. In response to a reduced light environment (RLE), shoot production did not increase on a weight basis; however, an etiolation response was detected as internode length increased 28% in plants grown in a 30% RLE and 39% in a 50 and 70% RLE. Root production on a weight basis was between 46 and 59% less in all RLE treatments compared to full sunlight treatments. Doveweed shoot growth was significantly greater in plants maintained above 50% field capacity (FC) and plants maintained at ≥75% FC produced more root biomass than 50, 25, and 12.5% FC treatments, further suggesting doveweed suggests a moist environment for growth and development.
520 $a Sequential applications of pre- and postemergence herbicides improved doveweed control compared to single applications. Indaziflam, dimethenamid-p, and oxadiazon applied at 0.054, 1.68, and 3.36 kg ai ha-1, respectively, provided ~12, 6, and 6 wk of doveweed control, respectively, when applied on May 1 in Augusta, GA. Postemergence control was greatest following sequential application of sulfentrazone + metsulfuron at 0.30 kg ai ha-1, thiencarbazone + iodosulfuron + dicamba at 0.176 kg ai ha-1, 2,4-D + MCPP + dicamba + carfentrazone at 0.123 kg ai ha-1, or thiencarbazone + foramsulfuron + halosulfuron at 0.136 kg ai ha-1 21 days apart.
520 $a Doveweed was determined to be tolerant of glyphosate applied at recommended rates. Investigation into the mechanism of tolerance determined glyphosate uptake by doveweed plants with an intact cuticle to be limited in comparison with doveweed plants with a disrupted cuticle and smooth crabgrass ( Digitaria ischaemum [Schreb.] Schreb. Ex Muhl.). (Abstract shortened by UMI.).
590 $a School code: 0050.
650 4 $a Biology, Botany. $3 1017825
650 4 $a Agriculture, Plant Culture. $3 1018669
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690 $a 0479
710 2 $a Clemson University. $b Plant and Environmental Sciences. $3 3169401
773 0 $t Dissertation Abstracts International $g 76-02B(E).
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