Virus-free seedling breeding system of citrus

Selection of excellent mother tree: a single plant with good horticultural characters was selected as the mother tree.

Identification (or detoxification): identification or detoxification and re-identification of the virus-carrying status of the selected mother tree.

Virus-free original species repository: it is mainly used to preserve the mother plants of excellent varieties that have been identified and detoxified, and virus diseases must be identified regularly.

Primary spike picking nursery: collect scions from mother trees, cultivate female seedlings, establish primary spike picking nursery, and provide virus-free scions of fine varieties for secondary ear picking nursery and tertiary nursery. The female seedlings of ear harvesting are generally limited to three years.

Second-level spike picking nursery: collect scions from primary ear-picking nursery, cultivate female seedlings, and establish secondary ear-picking nursery to provide virus-free scions of excellent varieties for third-class nurseries. The female seedlings of ear harvesting are generally limited to three years.

The third-level breeding nursery; the scion was collected from the secondary ear-picking nursery to cultivate excellent production seedlings.