RADISH (Raphanus sativus L.)HYBRIDS

I. Application and Amplification of General Seed Certification Standards

    A.    The General Seed Certification Standards are basic and together with the following specific standards

constitute the standards for certification of  hybrid radish seed. 

   B.     The General Standards are amplified as follows to apply specification to the hybrids of radish.

    1. Eligibility requirements for certification

(a)     The hybrids of radish maybe produced by seed to seed  method as the parents are by and large 

           fixed for the desired attributes.

 (b)     A hybrid is one  to be planted for any use except seed production. It may be anyone of the following  

        (i) Single cross - the first generation  resulting from the open pollination under controlled crossing of the two

            approved self- incompatible but cross-compatible inbred lines. The foundation single crosses  may be 

            of three types depending  upon the procedure of seed production;

            - seeds of only female parent are harvested and certified;

            - seeds of both parents are harvested separately and certified; 

               and

            - seeds of both the parents are harvested together, mixed  and certified.

        (ii) Double cross -the first generation  resulting from the controlled crossing of the two

approved self- incompatible but cross-compatible single crosses.

        (iii) Three way cross -the first generation resulting from controlled crossing of an approved inbred

   line and certified single cross being self-incompatible individually but cross compatible to each other 

    2.  Classes and sources of seed

a. Only the class "Certified" shall be recognized

b. A hybrid to be certified must be produced from certified Foundation seed or seed stocks approved

    by the Certification Agency.

II. Land requirements

    Land to be used for seed production of  the hybrid radish shall be free from volunteer plants.

III. Field Inspection

    A minimum of three inspections shall be made as follows:

    1.  the first  inspection shall be made before flowering to check isolation, offtypes,

         outcrosses , planting ratio, and other relevant factors; 

    2. the second inspection shall be made during flowering to check isolation, offtypes and other relevant

        factors;

    3. the third inspection shall be made  at maturity and prior to harvesting to check offtypes, seed borne 

        diseases and other relevant factors.

IV. Field Standards

A. General requirements

1. Isolation

    Seed fields of radish hybrids shall be shall be isolated from the contaminants shown in column 1 of the Table below by the distances specified in column 2 of the said Table:

                       Contaminants                                                                                       Minimum distance (meters)    

                              1                                                                                                           2

        Fields of other varieties including same single species including

        commercial  hybrid of the same variety                                                                       1600  

        Fields of the same hybrid (code designation)

        not conforming to varietal purity requirements for certification              

        and rat-tail radish (Raphanus caudatus L.)                                                                 1600

B. Specific requirements    

        Factor                                                                                              Maximum permitted (%)

Offtypes in each parent at and after flowering                                                    0.050

*Plants affected by seed borne diseases at final inspection                                 0.50

*Seed borne diseases shall be:

    Black leg: Leptosphaeria maculans (Desm.)Ces. & de Not)

    Black rot:Xanthomonas camepstris  pv.campestris (Pamm.) Dawson

        Factor                                                                                                Standards

Pure seed (minimum)                                                                                     98.0%

Inter matter (maximum)                                                                                    2.0%

Other crop seeds (maximum)                                                                         None

Weed seeds (maximum)                                                                                None

Germination (minimum)                                                                                   70%

Moisture (maximum)                                                                                       6.0%

For vapour-proof containers (maximum)                                                         5.0%