Perfect! Now I have all the information needed to provide a comprehensive answer about increasing red coloration in apples. Let me provide the response in English as requested.
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To increase red coloration in your apples, you need to understand that the red color is determined by **anthocyanin accumulation** in the skin cells. The key challenge is that high temperatures can degrade these anthocyanins, reducing color intensity and extension.
**THE SOLUTION: RESISTAR (formerly COLORADO)**
RESISTAR is a biostimulant specifically designed to enhance red coloration in fruits. It contains natural oligosaccharides that work through multiple mechanisms:
- **Protects anthocyanins** from enzymatic and thermal degradation at high temperatures
- **Increases osmotic potential** of cells, maintaining high water content even under elevated temperatures
- **Reduces thermal stress**, keeping photosynthetic activity stable
- **Stimulates PAL enzyme** (phenylalanine ammonia-lyase) involved in anthocyanin synthesis
- **Inhibits the greening action** of gibberellins
**APPLICATION PROTOCOL:**
**For Apple Varieties (Gala, Fuji, Pink)**
Apply **RESISTAR** as a foliar treatment:
- **Dosage**: 2.5 kg/ha when temperatures are below 32°C
- **Dosage**: 3 kg/ha when temperatures exceed 32°C
- **Timing**: 30 days before harvest AND 15 days before harvest
**COMPLEMENTARY CALCIUM NUTRITION:**
To maximize results, combine RESISTAR with calcium applications which improve skin quality and fruit consistency:
- **CAMAS**: 10 l/ha (calcium from chloride) - applies during fruit development
- **CANELA**: 3 l/ha (calcium from carbonate) - safer at high temperatures, prevents sun scald
**FIELD TRIAL DATA:**
A trial conducted on **Fuji variety** at Az. Grazia (Modena) demonstrated significant results:
- Treatments: 2.5 l/ha RESISTAR applied 30 and 15 days before harvest
- Results showed **28% increase** in fruits with superior coloration (75-100% red coverage)
- Better color distribution and intensity across all harvested fruit
This allows you to **harvest more quality fruit with fewer passes**, increasing efficiency and market value.