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177 Grossmann, K. 2010 Auxin herbicides: Current status of mechanism and mode of action Pest Manag. Sci. 66 113 120 10.1002/ps.1860 Holt, J.S. Chism, W.J. 1988 Herbicidal activity of NAA (1-naphthaleneacetic acid) on creeping

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indistinguishable for control versus 1-MCP-treated fruit, as in Expt. 1 (data not shown). Table 3. Effect of 1-methylcyclopropene (1-MCP) application alone and in combination with naphthaleneacetic acid (NAA) at the 10-mm stage on fruit set of ‘Pioneer

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genes for ethylene biosynthesis, perception, and cell wall degradation in ‘Delicious’ apples J. Amer. Soc. Hort. Sci. 133 727 734 Zhu, H. Yuan, R. Greene, D.W. Beers, E.P. 2010 Effects of 1-methylcyclopropene and naphthaleneacetic acid on fruit set and

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Naphthaleneacetic acid (NAA) treatments were applied to pruned and hedged vigorous plants of rabbiteye blueberry (Vaccinium ashei Reade). NAA application delayed shoot growth and resulted in earlier flowering and ripening of larger-sized fruit. NAA treatments effects lasted up to 3 years.

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Abstract

Preharvest application of naphthaleneacetic acid (NAA) at 10, 20, 40, and 60 ppm concentrations to immature ‘Zahdi’ date palm (Phoenix dactylifera L.) fruit 15 to 16 weeks after pollination (late chimri stage) influenced fruit size, quality, and ripening. Compared with the controls, 40 and 60 ppm NAA treatments increased fruit size, weight, volume, pulp to seed ratio, and moisture content At 60 ppm fruit weight was increased by 39%. Total soluble solids were not altered significantly. Fruit ripening was delayed at least one month by 40 and 60 ppm.

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Abstract

Naphthaleneacetic acid (NAA) formulated as a sodium salt and as the ethyl ester applied in the spring of 1975 and 1976 to unpruned trunks of Pyracantha coccinea (Roem.) cv. Rosedale effectively controlled sprout growth. The 1% concentration of each formulation reduced growth 4 cm more than the 0.5% concentration. The control averaged 49 sprouts and treated plants ranged from 2 to 4 sprouts.

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Abstract

Naphthaleneacetic acid (NAA) was applied to 10-year-old ‘Concord’ grapevine trunks at 0, 2, 4, and 8% concentrations. Best control of shoots on trunks was obtained with the 4 and 8% concentrations with no visual foliar injury or detrimental effects on yield, vine size, or fruit quality. One application of NAA at 8% reduced the number of trunk shoots for 3 years, but 100% control was obtained only in the year of application.

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Abstract

Gibberellic acid (GA3) has little effect on fruit set in seeded commercial varieties of apple unless pollination is prevented. To determine whether seedless apples might respond to GA, blossoms of several apetalous clones were treated with gibberellins. In addition, seeded and seedless fruits were sprayed several weeks after bloom with naphthaleneacetic acid (NAA), a fruit-thinning agent, to ascertain the role of seeds in auxin-induced fruit abscission.

GA3 was effective in increasing fruit set in 2 of the 6 clones tested, but had no effect on the remaining 4, only one of which crops heavily under orchard conditions. GA7 and GA4+7 were more active than GA3 in inducing fruit set in the 2 responsive clones. NAA thinned both seeded and seedless fruits of one clone. Fruit growth was inhibited in seedless fruits of 2 other clones, but abscission was not promoted. These results support the view that NAA-induced fruit abscission is not a result of seed abortion.

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Abstract

Naphthaleneacetic acid (NAA) treatments were applied to pruned or unpruned dormant, vigorous, upright apple branches (Malus domestica Borkh.) Bud-break was delayed by NAA, but total inhibition of bud development required the presence of actively growing shoots above the treated area. NAA reduced growth where it was applied, but because of compensating growth increases from untreated branch sections, total growth was unchanged. Applied to 1-year-old whips immediately after planting, NAA reduced the quantity of undesirable growth, increased the growth of favorably positioned shoots, and improved the crotch angles of those shoots.

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Abstract

Naphthaleneacetic acid (NAA) thinning sprays applied at appropriate intervals and dosage levels to 3 apple cultivars, verified the existence of a critical stage during which developing fruitlets were maximally sensitive. Average fruit diameter accurately identified NAA-sensitivity, but the index varied among cultivars. Polynomial regression analyses revealed a direct relationship between diameters of individual fruit samples and thinning response for each experimental unit. NAA-induced fruit abscission was usually maximal 2 to 3 days prior to the onset of cytokinesis in the endosperm. Cell wall formation did not invariably signify an end to the induction of significant abscission.

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