EL-500: an effective growth retardant for dwarfing southern pine seedlings

Hare, Robert C.

doi:10.1139/x84-023

Cited by 12 publications

(5 citation statements)

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“…Foliar applications of EL-500 have been reported to be non-phytotoxic with loblolly and slash pines, although the dwarfed growth appeared darker green than normal (8). PP 333 applications have also been reported to result in intensified greening of new growth (2).…”

Section: Resultsmentioning

confidence: 99%

Effect of Trunk Injection of Three Growth Regulators on Sprout Growth in Silver Maple

Arron¹

1985

AUF

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A short-term greenhouse study was conducted to evaluate growth retardation capabilities of potential plant growth regulators for silver maple. Two-year-old silver maple seedlings were pruned and trunk-injected with the growth regulators MBR 18337 {N-[4-(ethylthio)-2-(trifluoromethyl) phenyl]-methane-sulfonamide}x EL-500 {a-(1- methylethyl)-a-[4-(trifluromethoxy)phenyl]-5-pyrimidinemethanol]} and PP 333 {(2RS, 3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)pentan-3-ol}. All three growth regulators caused a significant reduction in the number of internodes per unit sprout length, when measurements were made three months after injection. EL-500 and PP 333 were the more effective. A high application rate of MBR 18337 (5 mg/seedling) caused the initial growth to exhibit phytotoxic symptoms, although this was temporary. Neither EL-500 or PP 333, at the application rates used, caused any malformed growth.

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Section: Resultsmentioning

confidence: 99%

Effect of Trunk Injection of Three Growth Regulators on Sprout Growth in Silver Maple

Arron¹

1985

AUF

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“…Brown spot has been effectively controlled by benomyl used as a root dip treatment before outplanting (Kais et al 1981a(Kais et al , 1981. A 4 percent nitric acid solution has been used to control weed competition and to provide nutrition to pine seedlings in the form of available nitrogen (Hare 1984). A single nitric acid application helps overcome growth inhibition caused by low soil fertility and weed competition.…”

Section: Introductionmentioning

confidence: 99%

Nitric Acid and Benomyl Stimulate Rapid Height Growth of Longleaf Pine

Kais¹,

Hare²,

Barnett³

1984

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“…However, these reports have largely concentrated on early "free" shoot growth of Pineaceae seedlings or the indeterminate growth of Cupressaceae and Taxodiaceae seedlings rather than on but set, second bud flush, or growth following dormancy. Hare (1984), however, has reported that flurprimidol could inhibit second flushing of loblolly (Pinus taeda L.) and slash (P. elliotti Engelm.) pines in a seed orchard.…”

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The effect of flurprimidol on bud flush, shoot growth, and on endogenous gibberellins and abscisic acid of Douglas-fir seedlings

Graham

Hobbs

Zaerr

1994

J Plant Growth Regul

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Abstract. For 4-month-old Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] seedlings under 17-h photoperiods in controlled environment conditions, flurprimidol (~t-(1-methlyethyl-a-[4-(trifluoromethoxy)phenyl]-5-pyrimidine-methanol) decreased incidence of second flushing from 81 to 54% and significantly reduced height growth in the second year following low-temperature treatment, in comparison to untreated controls. For seedlings under 15-h photoperiods, flurprimidol had only limited early effects, but after a period of bud dormancy, shoot growth was reduced to one-third that of the untreated controls. Under both photoperiods flurprimidol significantly depressed abscisic acid levels and gibberellin-like bioactivity. These results suggest that growth reduction in this conifer by flurprimidol may well involve inhibition of gibberellin biosynthesis.Late-summer bud flush is an unwanted occurrence in the production of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] seedlings. In nurseries, bud set is often induced by mild water stress (Duryea 1984). However, maintaining bud set and limiting height growth can be difficult. If applied too late in the growing season, then fertilization or even normal irrigation can stimulate second flushing (Lavender 1984). Although undercutting or top pruning has been used to combat second flushing (Duryea 1984), an even wider array of techniques for stopping late flushing and encouraging development of Abbreviations: GA, gibberellin; ABA abscisic acid; FPP, farnesyl pyrophosate; HPLC, high performance liquid chromatography; GC-EC, gas chromatography-electron capture; GC-MS, gas chromatography-mass spectrometry.

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EL-500: an effective growth retardant for dwarfing southern pine seedlings

Cited by 12 publications

References 0 publications

Effect of Trunk Injection of Three Growth Regulators on Sprout Growth in Silver Maple

Effect of Trunk Injection of Three Growth Regulators on Sprout Growth in Silver Maple

Nitric Acid and Benomyl Stimulate Rapid Height Growth of Longleaf Pine

The effect of flurprimidol on bud flush, shoot growth, and on endogenous gibberellins and abscisic acid of Douglas-fir seedlings

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