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  • Author or Editor: Michael A. Cohen x
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Abstract

Foliar applications of benzyladenine (BA) increased bud development of dwarf shoots of Pinus strobus L. When compared to dikegulac-sodium (Atrinal), pyranybenzyladenine (PBA), gibberellic acid (GA3), or pinching. Differences in rate of application of BA were not significant. Vegetative propagation of dwarf shoots varied between individual clones and between years.

Open Access

Abstract

Five year old container grown plants of Pinus ponderosa when treated with N6-BA at 500 and 1000 ppm during 1972 showed an increase in the number of dwarf shoots with developed buds on long shoots while lower concentrations used in 1971 were ineffective. Foliar applications of GA3 made during 1971 and 1972 were found not to increase bud development. Foliar applications of N6-BA applied in the spring of 1972 were more effective than fall applications. Removal of terminal buds also increased bud development within the dwarf shoot while combinations of N6-BA with removal of terminal buds was the most effective treatment.

Open Access

Abstract

Abscisic acid (ABA), when applied as an immersion application at 200 and 400 ppm during cold storage or as a spray application at 100 and 200 ppm at 2 stages of growth, was evaluated as an inhibitor of bud break and shoot elongation in dormant plants of Rosa cv. Helen Traubel and Syringa cv. Monge. ABA applied on 2 consecutive days at 100 and 200 ppm inhibited bud break in Rosa, but did not inhibit shoot elongation. ABA did not inhibit terminal and lateral bud break or shoot elongation in Syringa. Immersion applications at several dates during cold storage inhibited bud break and shoot elongation in Rosa and inhibited terminal and lateral bud break in Syringa. The most effective concentration in inhibiting bud break was 400 ppm. Time of application significantly affected bud break in Rosa and lateral bud break in Syringa, but did not alter shoot elongation in either plant.

Open Access