GB/T 9659-2026Citrus grafted nursery stock (English PDF)

5.1 Rootstock

5.1.1 The varietal purity meets the requirements, single-line varieties are preferred, and the rootstock-scion combination is reasonable.

5.1.2 It adapts to local ecological conditions and has strong resistance to adverse conditions and diseases.

5.1.3 The growth cycle from sowing to grafting should not exceed 18 months.

5.1.4 Seedlings with straight, healthy main stems, complete root systems, and well-developed fibrous roots are preferred.

5.2 Scion

5.2.1 The varietal purity meets the requirements and comes from mother trees of virus-free superior varieties or healthy plants from their propagation nurseries.

5.2.2 It is advisable to use vigorous, lignified spring shoots, summer shoots, and autumn shoots.

5.2.3 Each scion has more than 5 effective buds, the branches are plump, the buds are full, and there are no diseases, pests, or mechanical damage.

5.2.4 Scions used for cultivating virus-free seedlings should not carry viral diseases and viroid diseases specified in NY/T 973.

6.1.1 Basic Requirements

6.1.1.1 The main stem should be thick and straight, and the grafting point should be more than 10cm above the ground. The curvature of the rootstock-scion junction should not exceed 15°.

6.1.1.2 The graft union has healed normally, the binding material has been removed, and there are no obvious mechanical injuries or constriction marks. The rootstock stump is not exposed, and there are no defects or injuries.

6.1.1.3 It has 2 to 4 branches, each over 15cm long, that are not clustered, with the first branch being over 30cm above the ground (for kumquat seedlings). The first branch should be at least 25cm tall; the shoots should be fully lignified, healthy, and evenly distributed and spaced. Alternatively, the main trunk should be unbranched (for one-year-olds only). (Grafted seedlings).

6.1.1.4 The plant has a complete root system, with a taproot longer than 15cm, more than 5 primary lateral roots, and well-developed fibrous roots. There is no root coiling or twisting on the taproot and root collar. There should be no bending, twisting, or knotting. The root system should be pale yellow to white, without any tears, root diseases or pests, or root rot. (The main characteristics of container seedlings are...) The roots are not exposed.

6.1.1.5 The pathogen of Huanglongbing (HLB) should not be detected, and the plant should not carry canker lesions. The affected areas of other harmful organisms on the plant should be smaller than the entire plant's branches and leaves. 10%.

Note. Other harmful organisms include, but are not limited to, citrus anthracnose, resinosis, gummosis, spider mites, tarsiers, swallowtail butterflies, leaf miners, beet armyworms, whiteflies, and aphids. Leaf miners, snails, slugs, thrips, etc.

6.1.1.6 Virus-free citrus seedlings should meet the requirements of

6.1.1.5 and should not carry citrus bark cracking disease, leaf rot, or citrus degeneration virus stem spot type. Highly virulent strains can cause dwarfing disease in grapefruit, stem spot disease in sweet orange, and satsuma mandarin wilt disease, among others.

6.1.1.7 Grafted seedlings must have a purity of >=95%.

6.1.2 Grading of one-year-old seedlings One-year-old grafted seedlings, provided they meet all the requirements in 6.1.1, are further graded based on seedling diameter, seedling height, and the number of primary lateral roots. The grading criteria for different categories of grafted seedlings shall be implemented according to Table 1.

6.2.1 Basic Requirements

6.2.1.1 One-year-old grafted seedlings used for cultivating large seedlings for transplanting should meet the relevant indicator requirements listed in 6.1.1.

6.2.1.2 The basic requirements for transplanting large seedlings should comply with the provisions of 6.1.1.

6.2.1.3 No serious signs of flowering or fruiting.

6.2.2 Grading of large seedlings transplanted from seedbeds For transplanted large seedlings, provided they meet the requirements of 6.2.1, the following factors should be considered for transplantation. seedling diameter, seedling height, number of main branches, number of branching levels, and number of last shoots. The grading criteria for large seedlings are as follows: the grading of artificially planted large seedlings shall be carried out in accordance with Table 2.

6.3 Quality Judgment If a sample of one-year-old grafted seedlings does not meet the requirements of 6.1.1, or if a sample of transplanted large seedlings does not meet the requirements of 6.2.1, the seedlings shall be deemed to have failed to meet the requirements of 6.1.1. The seedlings were substandard. One-year-old grafted seedlings that meet the requirements of 6.1.1, and large transplanted seedlings that meet the requirements of 6.2.1, shall be selected based on the highest... The grade of citrus grafted seedlings is determined by the lowest grade indicator; seedlings below grade 2 are considered unqualified.

7.1 Sampling

7.1.1 Grafted seedlings of the same variety/rootstock cultivated at the same time, in the same place, and using the same method, or grafted seedlings sold in the same batch, constitute one inspection. Inspection group batch.

7.1.2 Sampling is conducted after the last shoots have stopped growing and at the time of transplanting. Each inspection batch constitutes a sampling batch, and random sampling is used. The minimum sampling rate shall be implemented according to Table 3.

7.2 Test Methods

7.2.1 Variety purity identification shall be performed in accordance with GB/T 3543.5.

7.2.2 The method for determining the quality indicators of grafted citrus seedlings shall be in accordance with Table A.1 in Appendix A.

7.2.3 Inspection of quarantine objects. Quarantine at the place of origin shall be carried out in accordance with GB 5040, and quarantine during transportation shall be carried out in accordance with GB 15569.

7.2.4 The testing of virus-free citrus seedlings shall be carried out in accordance with NY/T 973.

7.3 Judgment Rules If the sampling pass rate of grade and specification is >=95%, then all seedlings in this batch are deemed to meet the grade and specification. If the sampling pass rate for grade and specification is less than 90%, the seedlings in this batch are deemed to be non-compliant with the requirements of this grade and specification, and are therefore considered unqualified seedlings of this grade. If the sampling pass rate for a given grade and specification is >=90% and < 95%, the batch of seedlings is deemed to meet the requirements for that grade and specification. The pass rate for that grade is the sampling pass rate. Rate of return. The rules for determining the number of qualified citrus grafted seedlings in the same batch are shown in Table 4.