Calendar of Seed Preparation and Distribution of IWIN nurseries

  • June, Year 1. Seed is planted in El Batan. Field plots are repeatedly treated with systemic fungicides, and harvested seed is disinfected with a sodium hypochlorite solution. Seed from each line is inspected by CIMMYT's Seed Health Unit (SHU) and approved for quarantine multiplication in Mexicali.
  • July, Year 1. Nursery request forms are sent to IWIN cooperators. The global distribution list is finalized in January, Year 2.
  • November, Year 1. Seed is sent by air from El Batan for quarantine multiplication in Mexicali. Mexicali is recognized by the Mexican Government (NOM-001-FITO-1995), the North American Plant Protection Organization (NAPPO), and the European Plant Protection Organization (EPPO) as a Karnal bunt-free area. Mexicali field plots are repeatedly treated with systemic fungicides, visually inspected, and sampled for more diagnostic pathogen testing.
  • June-December, Year 2. Mexicali seed is harvested and returned to El Batan in sealed trucks. Internal seed from each line (>5,000 lines) is inspected by the SHU. Seed health certification is required before seed is cleaned, washed, treated, dried, and packaged.
  • January-December, Year 3. Nursery shipments are dispatched by express air couriers, or air freight, to cooperators in more than 120 countries.
  • January¬December, Year 4. Data are returned to CIMMYT-Mexico by IWIN cooperators, entered into the IWIS database, analyzed, and returned to cooperators on CD-ROM. They can also be made available in real time via web access (pending future application).

Please note that below list is a complete list of IWIN nurseries. Not all these nurseries are included in the Wheat Atlas database.

Bread Wheat Nurseries - Spring Wheat
ASWSN Acid-Soils Wheat Screening Nursery
EBWYT Elite Bread Wheat Yield Trial
ESWYT Elite Spring Wheat Yield Trial - grain color = WHITE
  • ESWYT-CHN (special edition for China)
HLAYT High Latitude Adaptation Yield Trial
HLWSN High Latitude Wheat Screening Nursery
HRWSN High Rainfall Wheat Screening Nursery - grain color = RED
HRWYT High-Rainfall Wheat Yield Trial - grain color = RED
  • HRWYT-CHN (special edition for China)
HTWSN Heat Tolerance Wheat Screening Nursery
HTWYT High Temperature Wheat Yield Trial
  • HTWYT-CHN (special edition for China)
IBWSN International Bread Wheat Screening Nursery (for irrigated conditions) - grain color = WHITE
  • IBSWN-CH (special edition for China)
ISWSN International Spring Wheat Screening Nursery
SATYN Stress Adaptive Trait Yield Nursery
SAWSN Semi-Arid Wheat Screening Nursery(for low rainfall conditions) - grain color = WHITE
SAWYT Semi-Arid Wheat Yield Trial
WAWSN Warmer Areas Wheat Screening Nursery
Bread Wheat Nurseries - Facultative and Winter Wheat
FAWWON-IR Facultative and Winter Wheat Observation Nursery for Irrigated Environments
FAWWON-SA Facultative and Winter Wheat Observation Nursery for Semi-Arid Environments
IWWYT-IR International Winter Wheat Yield Trial for Irrigated Environments
IWWYT-SA International Winter Wheat Yield Trial for Irrigated Environments
WWSRRN Winter Wheat Stem Rust Resistance Nursery
Durum Wheat Nurseries
EDUYT Elite Durum Yield Trial, unreplicated
IDSN International Durum Screening Nursery
IDYN International Durum Yield Nursery
Triticale Nurseries
FWTCL Facultative and Winter Triticale
ITYN International Triticale Yield Nursery
ITSN International Triticale Screening Nursery
Special and Project - Specific Nurseries
CSISAHT CSISA Heat Trial (CSISA = Cereal Systems Initiative for South Asia)
CSISASB CSISA Spot Blotch (CSISA = Cereal Systems Initiative for South Asia)
FHBSN Fusarium Head Blight Screening Nursery (earlier Scab Resistance Screening Nursery - SRSN)
GAWYT Global Adaptation Wheat Yield Trial
HPYT Harvest Plus Yield Trial
HPSAN Harvest Plus South Asia Nursery
IAT International Adaptation Trial
ISEPTON International Septoria Observation Nursery (earlier Septoria Monitoring Nursery – SMN)
KBSN Karnal Bunt Screening Nursery
SMN Septoria Monitoring Nursery (now International Septoria Observation Nursery – ISEPTON)
SRSN Scab Resistance Screening Nursery (now Fusarium Head Blight Screening Nursery)
STEMRRSN Stem Rust Resistance Screening Nursery
WYCYT Wheat Yield Consortium Yield Trial