GA3 reversed paclobutrazol growth inhibition except for ramped-temperature dwarf plants.

Gibberellic acid · disease · Malus domestica (apple)Positive and negative results

7 papers in the same direction as this claim · 2 in the opposite direction

1. negative
   Stored Empire fruit treated with GA 4+7 had more senescent breakdown than controls.

   Gibberellins A4+7 Influence Fruit Set, Fruit Quality, and Return Bloom of Apples · 1989 · compared with controls

   Opposite direction

2. no effect
   GA3 alone at 200 µg/mL had little influence on the incidence and development of blue and grey mould on apple wounds.

   An integrated strategy to control postharvest blue and grey mould rots of apple fruit by combining biocontrol yeast with gibberellic acid · 2007

   Opposite direction

3. positive
   Early GA 4+7 at 150 mg·liter −1 reversed PBZ-induced pedicel length inhibition.

   Paclobutrazol, Gibberellin, and Cytokinin Effects on Growth, Development, and Histology of Apple Pedicels and Fruits · 1989 · compared with PBZ-induced

   Same direction

4. positive
   Three applications of GA4+7 from petal fall significantly reduced scarf skin severity in apple.

   Effects of Prohexadione-Ca and GA4+7 on Scarf Skin and Fruit Maturity in Apple · 2006

   Same direction

5. positive
   GA-treated Haralson trees had reduced russet incidence relative to untreated trees.

   292 WAX PLATELET ARRANGEMENT, GA4+7 APPLICATIONS, AND THEIR RELATIONSHIPS TO RUSSET IN `HARALSON' APPLES · 1994 · compared with untreated trees

   Same direction

6. positive
   Spraying GA3 on Jonathan apples close to harvest reduced the incidence of storage breakdown.

   Effect of Preharvest Application of Gibberellic Acid (GA3) on Storage Breakdown of Apples1 · 1973

   Same direction

7. positive
   Bloom applied gibberellins plus benzylamino purine reduced disorder severity.

   Association of Calyx Green End Disorder of ‘Golden Delicious’ Apples with Tissue Fluoride1 · 1983

   Same direction

8. positive
   GA 4+7 at full bloom reduced alternate bearing severity in Braeburn apples.

   GA3, GA4+7, and GA7 Inhibit Flower Bud Formation and Reduce Alternate Bearing in Apple (Malus domestic Borkh.) · 1995

   Same direction

1 paper more in this group

class · disease · Malus domestica (apple)Results agree

5 papers in the same direction as this claim

1. positive
   GA sprays reduced russet severity and frequency.

   Effect of Early Season Foliar Sprays of GA4+7 on Russeting and Return Bloom of ‘Golden Delicious’ Apple · 1987

   Same direction

2. positive
   Non-root treatment with Harvista increased the resistance of fruits to damage when exposed to a stressor.

   THE EFFECT OF NON-ROOT TREATMENTS ON THE APPLE FRUITS RIPENING RATE CONTROL · 2024

   Same direction

3. positive
   Bloom applied gibberellins plus benzylamino purine reduced disorder severity.

   Association of Calyx Green End Disorder of ‘Golden Delicious’ Apples with Tissue Fluoride1 · 1983

   Same direction

4. positive
   The most efficacious auxin and ABA rates reduced bitter pit incidence of control fruit by 60% to 71% at harvest in 2021.

   Successive Early-season Abscisic Acid and Auxin Applications Consistently Mitigate Bitter Pit of ‘Honeycrisp’ Apples without Increasing Peel Calcium Concentration · 2025 · compared with control fruit

   Same direction

5. positive
   Combined use of growth regulators and fungicides gave the best reduction of fungal disease development in apple.

   The influence of fungicides and plant growth regulators on the susceptibility of apple trees ( · 2026

   Same direction