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Open access

R. J. Henny

Abstract

Autotetraploid (4n) plants of Dieffenbachia maculata (Lodd.) G. Don ‘Perfection’ flowered poorly, compared to diploids (2n), following treatment with 250 or 500 mg foliar spray of gibberellic acid (GA3)/liter. GA3-treated 4n plants produced bracts that normally precede flowering but remained vegetative and produced additional distal shoots instead of flowers.

Open access

W. R. Nelson and J. Van Staden

Abstract

A commercially available seaweed concentrate (Kelpak 66) was applied to nutrient-stressed plants of cucumber (Cucumis sativa L. cv. Pepinova) as a root dip at transplant or as a weekly foliar spray. Overall plant dry mass was increased by the seaweed treatment. Those plants receiving higher levels of seaweed treatment showed greatly increased root growth.

Open access

W. J. Kender

Abstract

(2-Chloroethyl) phosphonic acid (ethephon) applied as a foliar spray at 1000 and 2000 ppm to 3-, 4-, and 5-yr old nonbearing seedlings of apple (Malus pumila Miller) significantly increased the percentage of trees flowering for the first time and the total number of flower clusters per tree.

Open access

B. Tjia, L. Stoltz, M. S. Sandhu, and J. Buxton

Abstract

Ancymidol (α-cyclopropyl-α(pmethoxyphenyl)-5-pyrimidine-methanol) combined with surface active agents was tested to determine any increase of surface penetration for height control of hydrangea (Hydrangea macrophylla Thunb.) and Easter Lilies (Lilium longiflorum Thunb.) The nonionic surfactants polyoxpropylene polyethoxyethanol dihydroxypropane (Hydrowet), polyoxyethylene polypropoxypropanol dihydroxypropane (Regulaid), and alkarylpolyoxyethylene glycols (X-77) were used. Ancymidol with the surfactant was applied on hydrangea as a foliar spray at 25, 50 or 100 ppm concentration or as a soil drench containing 1, 2 or 3 mg ai per plant. Hydrowet and Regulaid were effective when applied as a foliar spray. Only Hydrowet was effective when applied as a soil drench. Greater height control occurred with the combination of the surfactant and ancymidol as a foliar spray. Easter lilies were sprayed with ancymidol and surfactant as a foliar spray at 50 or 100 ppm concentration as a soil drench at 0.25 or 0.50 mg ai per plant. Hydrowet, Regulaid, and X-77 all increased surface penetration of ancymidol but did not increase the effectiveness of soil drenches of ancymidol.

Open access

Mary Lewnes Albrecht

Abstract

Ranunculus asiaticus L. ‘Tecolote Giant White’ and Anemone coronaria L. ‘The Bride’ tubers were forced as spring pot crops in 1983 and 1984. Daminozide, ancymidol, and flurprimidol were used as preplant tuber dips or as foliar sprays. Foliar sprays were applied when the flower buds had grown to plant canopy height. A. coronaria ‘The Bride’ was not responsive to growth retardant treatment. Foliar application of ancymidol at 0.5 mg a.i./plant and daminozide as a 0.5% foliar spray were effective with R. asiaticus ‘Tecolote Giant White’ in reducing peduncle height without delaying time to anthesis. Daminozide as a 0.5% solution tuber dip provided an inadequate reduction in peduncle length at anthesis for either species. When ancymidol was used as a 1-min preplant tuber dip in the range of 10–25 mg a.i./liter of solution, excessive stunting and delay of anthesis resulted. Flurprimidol in the range of 3.0–10.0 mg a.i./liter as a preplant tuber dip and in the range of 0.1–10.0 mg a.i./plant as a foliar spray was effective in reducing peduncle length at anthesis. However, plants were considered unmarketable because of a slight delay in reaching full bloom and extreme growth reduction. Chemical names used: α-cyclopropyl-α-(4-methoxyphenyl)-5-pyrimidinemethanol (anycmidol); butanedioic acid mono(2,2-dimethylhydrazide) (daminozide); and α-(1-methylethyl)-α-[4-(trifluoromethoxy)phenyl]-5-pyrimidinemethanol (flurprimidol).

Open access

Fu-Zeng Sun and George C. Martin

Abstract

CGA-15281 was tested using an in vitro laboratory system with fruit-bearing shoots of ‘Manzanillo’ olive (Olea europeae L.). Foliar sprays produced greater fruit abscission and lower leaf abscission than stem feeding. Maximal fruit abscission with the least leaf abscission occurred at a concentration of 600 ppm, 23 to 25°C, and pH 7.

Free access

Osman Karaguzel, Ibrahim Baktir, Sadik Cakmakci, and Veli Ortacesme

The effects of method of application and dose of paclobutrazol on the growth and flowering characteristics of Lupinus varius L. were studied. On 17 Dec., seeds were sown into 18-cm pots (three seeds per pot) filled with a mixture consisting of 2 peat: 1 river sand (by volume). On 25 Mar., when 5% of the plants had elongated first internodes, doses of paclobutrazol at 0 (control), 0.625, 1.250, and 2.500 mg a.i./plant were applied to plants as a foliar spray or media drench. The application of paclobutrazol led to a slight shortening of the time to flowering, especially when applied as a foliar spray. Plant height and internode length, length, and internode length of the main inflorescence significantly decreased with increased doses of paclobutrazol and this also happened with the number of branches per plant, branch length, and length and internode length of branch inflorescence. On the contrary, stem, main, and branch inflorescence diameters significantly increased with increased doses of paclobutrazol, whether applied as a foliar spray or media drench. However, drench applications of paclobutrazol were consistently more effective than foliar spray treatments on most of the growth characteristics investigated. Paclobutrazol, in particular when applied as a foliar spray, also increased the number of flowers on main and branch inflorescences relative to the control, but media drenched applications of paclobutrazol at doses of 1.250 and 2.500 mg a.i./plant resulted in consistent significant reductions in the number of flowers on branch inflorescences. Chemical name used: (±)-(R*,R*)-β[(4-chlorophenyl)methyl]-α-(1,1-dimethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol).

Free access

Zhou Li, Yan Peng, and Bingru Huang

bentgrass through alteration in OA for water retention and suppressing stress-accelerated leaf senescence. The objectives of this study were to evaluate the effectiveness of foliar spray of GABA on drought and heat tolerance in creeping bentgrass, and to

Open access

Cathryn Chapman, Stephanie Rossi, Bo Yuan, and Bingru Huang

quantity as in GABA or proline treatment), or water (untreated control) were applied to the turf canopy as a foliar spray before the initiation of drought stress (on 6 Mar. 2018) and then every 7 d during the drought stress period (on 13, 20, and 27 Mar

Free access

Kiyoshi Banno and George C. Martin

Olive fruit harvest by mechanical shaking continues to be limited by poor fruit removal - less than 60% removal for most varieties. Whereas foliar spray of ethylene releasing compounds such as ethephon increases fruit removal percent, excessive leaf loss following treatment precludes commercial acceptance of the treatment. A classic case of serendipity has led to the testing of phosphorus as an olive fruit loosening agent. Na2 HPO4 at 25 mM applied via the cut stem of explants leads to massive leaf and fruit abscission. When the P source is applied at 100 mM foliar spray, fruit removal is accomplished with minimal leaf loss. Results of this investigation will cover P source, concentration, genera with abscission response and some indication of mechanism of action.