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Field experiments were conducted in the summers of 1988 and 1989 to evaluate sericea lespedeza control with POST herbicides. Triclopyr, picloram, 2,4-D, metsulfuron, dicamba, and selected herbicide mixtures were evaluated in 1988 and 1989. Clopyralid was evaluated in 1988 and fluroxypyr in 1989. Triclopyr at 0.56 and 1.12 kg ha–1 controlled sericea lespedeza both years. Fluroxypyr at 0.56 kg ha–1 also controlled sericea lespedeza. Control with picloram and metsulfuron was variable. Other treatments evaluated did not control sericea lespedeza.
Controlled environmental chamber experiments were conducted for a 14-d incubation period to measure the effect of temperature, light, light intensity, water potential, and pH on eclipta seed germination. In full light, seed germinated over a range of 10 to 35 C; however, germination was highest at 83% at 35 C. Seeds were strongly photoblastic with none germinating in the dark. Seeds germinated in light intensities between 6 and 100% of full light. Seeds germinated 78 to 88% in water potentials of 0.0, −0.1, and −0.2 MPa. In distilled water (pH ∼ 5.5) and a buffered solution pH 6 and 7, seeds germinated 85 to 89%; however, some seeds germinated in a buffered solution pH range of 5 to 8. After the first 14-d incubation period, ungerminated seeds were transferred to distilled water and incubated at 35 C in full light for 4 to 6 d as a second incubation period. Seeds germinated 89 to 96% after this second incubation period when first incubation was at temperatures 10 to 35 C in full light or darkness, light intensities 0 to 100% of full light, water potentials 0.0 to −0.8 MPa, and buffered solution pH levels of 5.5 to 7.
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