• Seed Germination Response of Penstemon spp. To Gibberellic Acid

      Palzkill, D. A.; DePaul, L.; Sivilli, C.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
      Treatment of seed with gibberellic acid (GA) resulted in significant increases in germination percent for Penstemon ambiguous, P. barbatus, P. eatoni, P. palmeri, P. parryi. P. pseudospectabilis, P. secundiflorus, and P. strictus in one or both of two experiments which were conducted. Germination of several other species increased with GA treatment, but differences were not significant.
    • Spray Carrier Volume and Irrigation Method Effects on XE-1019 Efficacy on Poinsettias

      Bailey, D. A.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
      Plants of Euphorbia pulchenima Wind. 'Gutbier V-14 Glory Annette Hegg Dark Red', and 'Annette Hegg Brilliant Diamond' were treated with 37 iw a.i. of XE-1019 applied in 102, 204, or 408 ml-m⁻² foliar sprays. Half of the plants received overhead irrigation and the remaining received soil-surface irrigations. No spray carrier volume effect or irrigation effect was observed for final plant height, bract canopy diameter, or for days from start of short days to bloom. The results obtained do not support the hypothesis that spray carrier volume or irrigation method affect the efficacy of XE-1019 on poinsettias.
    • Spray Carrier Volume Effects on XE-1019 and Chrysanthemums

      Bailey, D. A.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
      Plant of Chysanthemum morífolium Rymat. 'Ovaio' received 0, 102, 204, 304 or 408 ml-m⁻² of 0, 40, 20, 13.3, and 10 mg-liter⁻¹ XE-1019, respectively. No treatment affected time from start of short days to bloom or inflorescence display diameter. All XE-1019 treatments resulted in shorter plants than controls did. No carrier volume effect on plant height was observed. The inflorescence height range per pot decreased with increasing carrier volume. The greater inflorescence height uniformity achieved with the high carrier volume is beneficial and warrants further investigation.
    • Underutilized Native Woody Legumes for Landscape Use

      Johnson, M. B.; Palzkill, D. A.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
    • Use of Growth Retardants for Floral Initiation of Hydrangeas

      Bailey, D. A.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)
      Floral initiation was successfully stimulated for plants of Hydrangea macrophylla 'Rose Supreme' under non-inductive environmental conditions by spraying plants with XE-1019 or paclobutrazol. Effective treatments were 10 weekly of 5 biweekly sprays of 100 mg-liter ⁻¹ paclobutrazol; 5 biweekly sprays of 11 or 30 mg-liter⁻¹ XE-1019, and 4 triweekly (once every 3 weeks) sprays of 15 or 30 mg-liter⁻¹ XE-1019.
    • Variation in Flowering and Germination in Hilaria belangeri

      Ralowicz, A. E.; Mancino, C. F.; Kopec, D. M.; Kopec, David M. (College of Agriculture, University of Arizona (Tucson, AZ), 1988)