One AVG plus two NAA applications gave less Golden Supreme fruit drop than one or two AVG applications.

1-naphthaleneacetic acid · yield · Malus domestica (apple)Results differ

49 papers in the same direction as this claim · 15 in the opposite direction

1. negative
   NAA increased fruit abscission at the 11-mm stage.

   Aminoethoxyvinylglycine Inhibits Fruit Abscission Induced by Naphthaleneacetic Acid and Associated Relationships with Expression of Genes for Ethylene Biosynthesis, Perception, and Cell Wall Degradation in ‘Delicious’ Apples · 2008

   Opposite directionCites this paper

2. positive
   Adding NAA counteracted Ethrel-stimulated abscission.

   Interaction of Succinic Acid 2,2-Dimethyl Hydrazide, 2-Chloroethylphos-phonic Acid and Auxins on Maturity, Quality and Abscission of Apples1 · 1970 · compared with Ethrel treatment

   Same directionCited by this paper

3. positive
   NAA mixed with ethephon delayed ethephon-induced fruit drop.

   Effects of Aminoethoxyvinylglycine (AVG) on Preharvest Fruit Drop and Maturity of ‘Delicious’ Apples · 1997 · compared with ethephon

   Same directionCited by this paper

4. positive
   NAA at 6 or 15 mg·L−1 increased fruit abscission in both cultivars.

   Effects of 1-Methylcyclopropene and Naphthaleneacetic Acid on Fruit Set and Expression of Genes Related to Ethylene Biosynthesis and Perception and Cell Wall Degradation in Apple · 2010

   Same directionCites this paper

5. positive
   NAA retained up to about 27% of total fruit number relative to controls in a high-drop year.

   AVG, NAA, boron, and magnesium influence preharvest fruit drop and fruit quality of ‘Honeycrisp’ apples · 2017 · compared with untreated control trees

   Same directionCites this paper

6. positive
   AVG and NAA programs tended to mitigate fruit drop most in heavy drop years.

   The Effects of Aminoethoxyvinylglycine and Naphthaleneacetic Acid Treatments on Abscission and Firmness of ‘Scarletspur Delicious’ Apples at Normal and Delayed Harvests · 2009

   Same directionCites this paper

7. positive
   NAA treated fruit were firmer than untreated fruit in two of three years.

   Multiple season-long sprays of ethephon or NAA combined with calcium chloride on ‘Honeycrisp’ apples: I. Effect on bloom and fruit quality attributes · 2019 · compared with untreated fruit

   Same directionCites this paper

8. positive
   NAA applications one month before harvest appreciably reduced fruit drop.

   Effect of Naphthalene Acetic Acid and Calcium chloride on pre-harvest drop and quality of ‘Red Delicious’ apple. · 2017

   Same directionCites this paper

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