Introduction to Dendrobium Orchids
- Dendrobiums are native to Southeast Asia.
- They thrive in tropical climates with high humidity.
- Suitable for coastal areas like Chennai.
Varieties of Dendrobium Orchids
- Sonia-17: Purple and white flowers.
- Sonia-28: Popular for its vibrant blooms.
- Emma White: Known for its elegance.
- Sakura Pink: Aesthetic pink variety.
Growing Environment
- Requires 75% shade netting.
- Ideal humidity: 70-80%.
- Day temperature: 21-29°C; Night: 18-21°C.
- Rainshelter needed in high rainfall zones.
Propagation Methods
- Division of clumps and keikis.
- Utilization of back bulbs.
- Tissue culture for mass propagation.
Irrigation and Nutrients
- Mist or overhead sprinklers for humidity.
- Foliar NPK application: 20:10:10 @ 0.2% weekly.
Growth Regulators and Repotting
- GA3 foliar application at 50 ppm bi-monthly.
- Repot every 2-3 years or when necessary.
- Best time to repot: when new roots emerge.
Harvesting Techniques
- Harvest when 75% of flowers are open.
- Cut lower 0.75cm of the peduncle post-harvest.
- Yield: 8-10 spikes per plant annually.
Post-Harvest Handling
- Pulsing: 8-HQC 500 ppm + Sucrose 5% for 12 hrs.
- Holding solution: AgNO3 25 ppm + 8-HQC 400 ppm.
- Wrap with 50 gauge polythene.
Pests and Diseases
- Handpick snails and slugs.
- Bacterial diseases treated with Streptomycin.
- Fungal issues managed with Metalaxyl.
Conclusion
- Effective management ensures healthy orchid growth.
- Regular monitoring for pests and diseases is crucial.
- Thank you for your attention!