International union for the protection of new varieties of plants
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GUIDELINES FOR THE CONDUCT OF TESTS FOR DISTINCTNESS, UNIFORMITY AND STABILITY Alternative Names:*
The purpose of these guidelines (“Test Guidelines”) is to elaborate the principles contained in the General Introduction (document TG/1/3), and its associated TGP documents, into detailed practical guidance for the harmonized examination of distinctness, uniformity and stability (DUS) and, in particular, to identify appropriate characteristics for the examination of DUS and production of harmonized variety descriptions. ASSOCIATED DOCUMENTS These Test Guidelines should be read in conjunction with the General Introduction and its associated TGP documents. TABLE OF CONTENTS PAGE 1. Subject of these Test Guidelines 3 2. Material Required 3 3. Method of Examination 3 3.1 Number of Growing Cycles 3 3.2 Testing Place 3 3.3 Conditions for Conducting the Examination 3 3.4 Test Design 4 3.5 Number of Plants / Parts of Plants to be Examined 4 3.6 Additional Tests 4 4. Assessment of Distinctness, Uniformity and Stability 4 4.1 Distinctness 4 4.2 Uniformity 5 4.3 Stability 5 5. Grouping of Varieties and Organization of the Growing Trial 5 6. Introduction to the Table of Characteristics 6 6.1 Categories of Characteristics 6 6.2 States of Expression and Corresponding Notes 6 6.3 Types of Expression 6 6.4 Example Varieties 6 6.5 Legend 6 7. Table of Characteristics/Tableau des caractères/Merkmalstabelle/Tabla de caracteres 7 8. Explanations on the Table of Characteristics 13 8.1 Explanations covering several characteristics 13 8.2 Explanations for individual characteristics 13 9. Literature 16 10. Technical Questionnaire 17 1.Subject of these Test GuidelinesThese Test Guidelines apply to all varieties of Mentha ×piperita L. (sterile interspecific hybrid between Mentha spicata L. and Mentha aquatica L.) 2.Material Required2.1 The competent authorities decide on the quantity and quality of the plant material required for testing the variety and when and where it is to be delivered. Applicants submitting material from a State other than that in which the testing takes place must ensure that all customs formalities and phytosanitary requirements are complied with. 2.2 The material is to be supplied in the form of rooted cuttings. 2.3 The minimum quantity of plant material, to be supplied by the applicant, should be: 30 rooted cuttings. 2.4 The plant material supplied should be visibly healthy, not lacking in vigor, nor affected by any important pest or disease. 2.5 The plant material should not have undergone any treatment which would affect the expression of the characteristics of the variety, unless the competent authorities allow or request such treatment. If it has been treated, full details of the treatment must be given. 3.Method of Examination3.1 Number of Growing CyclesThe minimum duration of tests should normally be two independent growing cycles. 3.2 Testing PlaceTests are normally conducted at one place. In the case of tests conducted at more than one place, guidance is provided in TGP/9 “Examining Distinctness”. 3.3 Conditions for Conducting the Examination3.3.1 The tests should be carried out under conditions ensuring satisfactory growth for the expression of the relevant characteristics of the variety and for the conduct of the examination. 3.3.2 The recommended method of observing the characteristic is indicated by the following key in the second column of the Table of Characteristics: MG: single measurement of a group of plants or parts of plants MS: measurement of a number of individual plants or parts of plants VG: visual assessment by a single observation of a group of plants or parts of plants VS: visual assessment by observation of individual plants or parts of plants | ||||||||||||||||||||||
