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  • Author or Editor: Nancy E. Maness x
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`Arp' rosemary cuttings were treated with indole butyric acid (IBA) using three different application procedures to determine speed and quality of rooted cuttings produced at three weeks under mist. Five concentrations of IBA, 0%, 0.8%, 1.6%, 3.0%, and 4.5%, and three methods of application were compared. Methods of application were 1) cuttings treated with solutions containing IBA, captan, benomyl, and streptomycin applied as a one minute soak or 2) as a post plant drench or 3) cuttings soaked for one minute in a solution of captan, benomyl and streptomycin and then dipped into IBA + talc mixture. After the treatments were applied, the cuttings were placed on a mist bench for three weeks. Visual shoot ratings were made weekly and visual root ratings were made at three and four weeks after treatments were applied. Root dry weights were determined. Results indicated the one minute soak in a captan, benomyl, and streptomycin solution then dipped in 0.8% IBA + talc consistently resulted in a higher quality rooted cutting.

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Aerial blight of rosemary (Rosemarinus officinalis) caused by Rhizoctonia solani (AG-4) is a problem in production of rooted cuttings. Two separate studies were conducted on rosemary cuttings during propagation. Four levels of R. solani were mixed into potting medium at the rates of 0, 0.01, 0.1 and 1.0 percent (w/w). Seven treatments were evaluated: Trichoderma harzianum alone, Laetisaria arvalis alone, iprodione (single application, full rate), CGA 173506 (single application, full rate), T. harzianum + iprodione (single application, 1/2x rate), L. arvalis + CGA 173506 (single application, 1/2x rate), and a control. Biocontrol agents were mixed into medium at a rate of 5g/kg medium. Mycelial growth began by day four on the medium surface in the 0.1 and 1.0 R. solani levels. By day six, cuttings showed signs of infection. Disease incidence increased with higher levels of R. solani inoculum. At levels 0.01, 0.1 and 1.0, the L. arvalis plus 1/2x rate one time application CGA 173506 and iprodione alone (full rate one time application) gave the best control of aerial blight in both experiments. In the first experiment, iprodione alone and T. harzianum plus 1/2x rate iprodione gave the most root growth at the 0.01, 0.1 and 1.0 R. solani levels. In the second experiment, L. arvalis plus 1/2x rate CGA 173506 gave best root growth. At level 0, treatments were not significantly different in either experiment.

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Dalmation sage was transplanted in rows 92 cm apart with in-row spacing of 30 cm on 12 April 1989 at the Vegetable Research Station, Bixby, Oklahoma. Plots one row by 55 m long were established to determine the best timing for harvest and to observe the effect of cutting height and date on yield and regrowth in the fall and regrowth the following season.

Four harvest dates in 1989 were 15 August, 25 August, 18 September and 8 November. In addition, one half of the plots harvested 15 August were recut on 5 November. Cutting height was 10 cm on 15 August, 12 cm on 25 August and 15 cm at all other harvest dates in 1989 and 1990. Four harvests were made on all plots during the 1990 season except those cut or recut in November 1989. Spring 1990 regrowth was very poor and no harvest was possible in April 1990 on November 1989 harvested plots. Highest total dry weight yields for the 1989 and 1990 seasons were produced by the 15 August initial cut with a 5 November recut (11,522 kg·ha-1) and the 8 November 1989 cut plots (10,881 kg·ha-1). Other plots that were harvested once in August or September 1989 plus four separate harvests in 1990 produced a total yield near 9,500 kg·ha-1. The 15 cm height of cut appeared to be superior to cutting closer to the soil.

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