-naphthaleneacetic acid (NAA) has been successfully used to control basal sprouts in several crops ( Boswell and McCarty, 1974 ; Eynard et al., 1986 ; Holt and Chism, 1988 ; Stover et al., 2006 ) and has shown some success in sucker control in hazelnut in Europe
sufficient return bloom. Table 1. Effects of early summer naphthaleneacetic acid (NAA) and ethephon sprays applied in 2007 on return bloom of ‘York Imperial’/M.9 apples in 2008 in Virginia. z Table 2. Effects of AVG on the efficacy of early summer NAA and
naphthaleneacetic acid (NAA) treatments in 2004 on bloom of ‘Golden Delicious’ and ‘Fuji’ apple trees in 2005. Table 2. Effects of time of four applications of 5 ppm (mg·L −1 ) naphthaleneacetic acid (NAA) at different times in 2004 on bloom of ‘Golden Delicious
Two methods of application, the Danish Easy Roller and the German Sprühsystem, were tested to evaluate the effectiveness of naphthaleneacetic acid (NAA) at reducing leader growth (tips of primary axes) of fraser fir [Abies fraseri (Pursh) Poir.] Christmas trees. A commercial product, Sucker-Stopper RTU (1.15% ethyl 1-NAA), was applied to leaders at concentrations of 0 to 500 mL·L−1 when leaders were 8 to 15 cm long. As the concentration increased, leader elongation decreased. The Easy Roller reduced leader growth the most, but leader mortality was unacceptable at concentrations 20 mL·L−1 or greater. Although less effective than the Easy Roller, the Sprühsystem caused negligible mortality of leaders. Applying 40 mL·L−1 with the Easy Roller yielded ≈50% of leaders with target lengths of 20 to 36 cm with little mortality. The Sprühsystem gave similar results at 250 mL·L−1. NAA might be useful for producing dense trees with minimal shearing or for producing more natural, open trees during shorter rotations.
and Palmer, 1982 ; Yuan and Greene, 2000b ). Some researchers reported that the primary mechanism of fruit thinning by chemical thinners such as naphthaleneacetic acid (NAA) and 6-benzylaminopurine (6-BA) is the result of reduced carbohydrates
preharvest fruit drop can occur independently of fruit ethylene production ( Sun et al., 2009 ). Losses resulting from preharvest fruit drop can be mitigated by applying either naphthaleneacetic acid (NAA; Fruitone L; AMVAC Chemical, Newport Beach, CA) or
significant differences among means drawn on the same vertical order. Means separation was done by Duncan's multiple range test ( P < 0.05). NAA = naphthaleneacetic acid; BA = 6-benzyladenine. Ethylene evolution was measured before treatment on the day of
). Increased abscission of young apple fruit caused by the chemical thinner naphthaleneacetic acid (NAA) is linked with increased ethylene production; hence, NAA may act in part through ethylene signaling ( Curry, 1991 ; Zhu et al., 2008 ). The pathway of
Spray applications of NAA or NAA ethylester at 1000 ppm acid equivalent (A.E.) reduced axillary bud number by 30% and 21%, and weight by 73% and 52%, respectively, on pinched potted chrysanthemums, Chrysanthemum ×morifolium Ramat. ‘Mountain Snow’ and ‘Mountain Peak’. Diameter of floral sprays and vegetative heights also were reduced with increasing concentrations. Flower number was not affected by the treatments. NAA treatments caused leaf epinasty, but NAA ethylester treatments did not. Chemical names used: 1-naphthaleneacetic acid (NAA).
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.