Detailed Explanation of the Citrus Virus-Free Nursery Stock Propagation System

Selection of superior mother trees: Select individual plants of varieties with excellent horticultural traits as mother trees.

Identification (or virus elimination): Identify the virus status of the selected mother trees or perform virus elimination, then re-identify for confirmation.

Virus-free foundation stock repository: Mainly used to preserve mother plants of excellent varieties that have been identified as virus-free; virus disease identification must be carried out regularly.

First-level scion collection orchard: Collect scions from mother trees, cultivate scion mother stock plants, and establish a first-level scion collection orchard to provide virus-free scions of excellent varieties for the second-level scion collection orchard and the third-level nursery. Scion mother stock plants are generally limited to three years of use.

Second-level scion collection orchard: Collect scions from the first-level scion collection orchard, cultivate scion mother stock plants, and establish a second-level scion collection orchard to provide virus-free scions of excellent varieties for the third-level nursery. Scion mother stock plants are generally limited to three years of use.

Third-level propagation nursery: Collect scions from the second-level scion collection orchard and cultivate excellent production nursery stock.