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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Peregoy, R. S.;
Kitchen, L. M. |
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| Author Affiliation: | Department of Plant Pathology and Crop Physiology, Louisana Agricultural Experiment Station, Louisana State University Agricultural Center, Baton Rouge, LA. |
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| Title: | Moisture Stress Effects on the Efficacy of Haloxyfop in Grasses. |
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| Meeting Info.: | Held: January 18-20, 1988, Tulsa, OK. |
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| Source: | Southern Weed Science Society Proceedings. Vol. 41, January 1988, p. 278. |
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| Publishing Information: | Nashville, TN: Southern Weed Science Society. |
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| Keywords: | TIC Keywords: Haloxyfop; Water stress; Sorghum halepense; Digitaria sanguinalis; Absorption; Translocation; Phytotoxicity
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| Abstract/Contents: | "Glasshouse experiments were conducted to determine the effects of imposed moisture stress on the growth of johnsongrass [Sorghum halepense (L.) Pers.] and large crabgrass [Digitaria sanguinalis (L.) Scop.], the control of these grasses with haloxyfop and the absorption and translocation of radiolabeled grasses with haloxyfop in both species. Johnsongrass and crabgrass were grown in a glasshouse with a 33-36 C day and 20-23 C night. A 14 hr photoperiod was maintained through the use of metal halide lamps. Plants were grown in a commercial potting mixture and two moisture levels were established by selective watering. A well-watered, non-stressed treatment was established by daily watering of the plants. Plants in the moisture-stressed treatment were not watered for 7-8 days prior to herbicide treatment. At the time of treatment, leaf water potentials were measured utilizing a pressure chamber. Plant height, number of tillers, and plant dry weight were also determined on the day of treatment. Phytotoxicity and absorbtion and translocation studies were conducted 15-16 days after planting. In phytotoxicity studies, johnsongrass was treated with 0.025 kg ai/ha and crabgrass was treated with 0.030 kg ai/ha. Regrowth was measured 12 days after treatment (DAT) in johnsongrass and 15 DAT in crabgrass. In absorbtion and translocation studies, the plants received 0.05 uCi of 14C-haloxyfop applied in 10, 0.5 ul droplets to a 2.0 cm2 area of the uppermost fully expanded leaf. Plants were harvested at 1, 3, 5, 24, 48, 72, and 96 hrs after treatment. At harvest, the treated leaf area was rinsed in distilled water for 30 sec followed by a 30 sec rinse in chloroform. The remainder of the plant was then separated, lyophilized, and oxidized. Radioactivity in the leaf washes and the plant parts was determined using a liquid scintillation counter. Moisture-stresses johnsongrass plants were significantly shorter, had fewer tillers, and less dry weight than well-watered plants. The leaf water potential of the stressed plant was -15.9 bars compared to -6.0 bars for the watered plants. Absorption of the radiolabel by the stressed plants was reduced only at the 1, 3, and 5 hr harvest. The amount of radiolabel in the leaf wash was significantly greater for the stressed plants at the 1, 3, and 5 hr harvest also. Translocation to plant parts above the treated leaf was reduced in the water-stressed plants at 5, 24, 48, and 72 hr after treatment. The growth of moisture-stressed crabgrass plants was reduced compared to the watered plants. The leaf water potential of the stressed plant was -18.0 bars compared to -6.2 bars for the watered planted. The water stressed plants absorbed less of the radiolabel than the watered plants at the 1, 3, 5, and 24 hr harvests. The amount of radiolabel in the leaf wash was significantly greater in the stressed plants at the 1, 3, 5, 24, and 48 hr harvest times. Movement of the radiolabel to plant parts above the treated leaf was reduced in the water stressed plants at all harvest times." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Peregoy, R. S., and L. M. Kitchen. 1988. Moisture Stress Effects on the Efficacy of Haloxyfop in Grasses.. South. Weed Sci. Soc. Proc. 41:p. 278. |
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