[1] Features and Characteristics
GA4+7 is a biochemical pesticide composed of a mixture of two gibberellic acids. It significantly promotes the elongation of plant fruit cells and is widely used on fruit-bearing plants to improve quality and yield.
[2] Application Techniques
- Apple:
- Apply 12.5–25 mg/L GA4+7 solution alone or in combination with 22.5–30 mg/L benzyladenine during full bloom and the young fruit stage after flowering. Spray evenly across the entire plant.
- For shaping “Hongxing” apples: Apply a fine mist to flower fronts during full bloom to late bloom, ensuring the solution coats the pistils. Each flower should be sprayed once (avoid repeat applications). This improves fruit shape index, increases fruit set, and boosts yield.
- Pear:
- Apply 10–12.5 mg/L GA4+7 mixed with 10–12.5 mg/L GA3 within 20–30 days after petal fall by coating the middle of the fruit stem. Alternatively, apply during fruit thinning or bagging. Use approximately 20 mg of the emulsion mixture per fruit.
- Cucumber:
- Spray 18–20 mg/L GA4+7 (1:1 ratio with benzyladenine) on leaves one day before flowering, during full bloom, and at the young fruit stage. Ensure uniform coverage.
- ”Jufeng” Grape:
- Soak clusters in 50 mg/L GA4+7 solution 4 days before initial flowering and 10 days after full bloom. This achieves >95% seedless fruit, increases single-fruit weight (>7 g), raises soluble solids by 2%, and accelerates maturity by 10 days (though total amino acids slightly decrease). Stronger shoot growth enhances seedlessness and early ripening.
- Spray or dip clusters with 25 mg/L GA4+7 one day before flowering, followed by 25 mg/L GA3 + 20 mg/L forchlorfenuron during full bloom to increase fruit set to 123.1%.
- ”Jingya” Grape:
- Spray or dip clusters with 12.5 mg/L GA4+7 one day before flowering, combined with 25 mg/L GA3 + 20 mg/L forchlorfenuron during full bloom to achieve 100% seedlessness.
- Citrus, Lychee, Longan:
- Spray entire plants (focus on flowers/fruits) with 0.01–0.02 mg/L solution. Use 2.5–5 mg/L (with brassinolide) during early flowering or young fruit stage to strengthen flowers and protect fruits.
[3] Precautions
- Select appropriate concentrations based on plant variety.
- Store raw material in a cool, dry place; avoid high temperatures.
- Use alone; do not mix with copper-based agents, alkaline fertilizers/pesticides. If combining with slightly acidic (amino acid) foliar fertilizers, conduct a small-scale safety trial first.
