”VARIETY NAME” by gyvwpsjkko

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									                                                                     Technical Bulletin
                                                                          Ref. Sweet Crunch: 31/07/10




                                                    SWEET CRUNCH
                                                             F1 Hybrid Cucumber


OUTSTANDING QUALITIES
     BEIT ALPHA TYPE
     IDEAL PRE-PACK
     HIGH YIELD POTENTIAL
     BRIGHT, SMOOTH, GLOSSY FRUIT
     DISEASE RESISTANCE

Sweet Crunch is an early maturing, Beit
Alpha type hybrid with a very high yield
potential. Sweet Crunch has a superior
flavour, smooth texture and is ideal as a pre-
pack type when picked at 12 - 15 cm length.
For the ‘gherkin’ market, fruit are picked
smaller. The fresh, glossy appearance is very
attractive. Sweet Crunch has intermediate
resistance against Downy mildew (Pcu) and Powdery mildew (Px).

SPECIAL VARIETAL REQUIREMENTS
  Contact area representative for more information

  CHARACTERISTIC*                                        SWEET CRUNCH
  KIND                                                   F1 hybrid cucumber (Cucumis sativus L.)
  TYPE                                                   Beit alpha
  FLOWERING TYPE                                         Gynoecious (Predominantly female flowers)
  PRODUCTION TYPE                                        Open field production
  MATURITY                                               Early
  SEASON                                                 Year round production in frost free areas
  FRUIT SIZE                                             12 – 15 cm
  SHAPE                                                  Cylindrical
  COLOUR                                                 Glossy green
  SPINE COLOUR                                           White
  SPINE DEGREE                                           Hardly noticeable
                                                         Intermediate resistance: Pseudoperonospora cubensis (Pcu) and
  DISEASE REACTION                   (SCIENTIFIC)
                                                         Podosphaera xanthii (Px)
  UNIFORMITY                                             Very good
  AVERAGE SEED COUNT                                     30 - 40 seeds/g
  MARKETS / END USE                                      Fresh market, pre-pack and gherkin
  POPULATION GUIDE                                       12 000 – 16 000 plants per ha
  SPECIAL FEATURES                                       Excellent disease package
* Characteristics given are affected by production methods such as soil type, nutrition, planting population, planting date and climatic conditions.
   Please read disclaimer.




Disclaimer: This information is based on our observations and/or information from other sources. As crop performance depends on the interaction between the genetic potential
of the seed, its physiological characteristics, and the environment, including management, we give no warranty express or implied, for the performance of crops relative to the
information given nor do we accept any liability for any loss, direct or consequential, that may arise from whatsoever cause. Please read the Sakata Seed Southern Africa (Pty)
Ltd Conditions of Sale before ordering seed.
Resistance: is the ability of a plant variety to restrict the growth and development of a specified pest or pathogen and/or the damage they cause when compared to susceptible
plant varieties under similar environmental conditions and pest or pathogen pressure. Resistant varieties may exhibit some disease symptoms or damage under heavy pest or
pathogen pressure (HR = High resistance, IR = Intermediate resistance).
Recent version: Kindly contact Sakata or Area Representative for the most recent version of this Technical Bulletin.

Sakata Seed Southern Africa (Pty) Ltd.                             Copyright: (not to be reproduced)                                Email. info.saf@sakata-eu.com
Tel. +27 11 548 2800                                                    Fax. +27 11 548 2820                                           Website. www.sakata.com
                                                                     Technical Bulletin
                                                                          Ref. Sweet Crunch: 31/07/10



                               GENERAL TIPS FOR CUCUMBER PRODUCTION
Crooked fruit
It is common for young cucumber fruit to become                                                 Blossom end rot (BER)
crooked. Crooked fruit are not acceptable by the                                                Symptoms
market in general.                                                                              - Resembles a pathological disease at the blossom
                                                                                                  end, but actually is a physiological disorder due
Symptoms                                                                                          to a Ca deficiency at the blossom-end of a fruit
- Development on one side of the fruit is inhibited,
  leading to bending to various degrees                                                         Causes
                                                                                                - Low Ca levels
Causes                                                                                          - BER is not caused by any single factor but a
- Extreme fluctuation in temperature and humidity                                                 combination of one or more factors intensifying
- High EC                                                                                         the effect, including: high salinity, high Mg, NH4,
- Disease                                                                                         and/or K concentration, inadequate xylem tissue
- Over bearing                                                                                    development,       accelerated      growth     rate,
- Water stress                                                                                    unfavourable moisture relationships (high, low,
- Heat stress                                                                                     or fluctuating), low soluble soil Ca, high
- Ca and B deficiency                                                                             temperature, and high or low transpiration
- Thrips damage on the young fruit
- Poor pollination (not applicable to parthenocarpic                                            Control
  fruit)                                                                                        - Revise the fertigation programme
                                                                                                - Improve ventilation to improve transpiration
Control                                                                                         - Apply Ca sprays after cloudy weather
- Control thrips and disease
- Regulate greenhouse temperature                                                               Disease resistance definition
- Revise fertigation and irrigation programme and                                               Resistance: is the ability of a plant variety to
  apply foliar sprays of Ca and B if required                                                   restrict the growth and development of a specified
- Remove some fruit if plants are over loaded                                                   pest or pathogen and/or the damage they cause
                                                                                                when compared to susceptible plant varieties
Cracking                                                                                        under similar environmental conditions and pest or
Symptoms                                                                                        pathogen pressure. Resistant varieties may exhibit
- Longitudinal cracks appear between ribs on fruit.                                             some disease symptoms or damage under heavy
  Cracks can be almost invisible, to large and                                                  pest or pathogen pressure.         Two levels of
  unattractive                                                                                  resistance are defined:

Causes                                                                                          High/standard resistance (HR): plant varieties
- Fluctuation in transpiration rate between day and                                             that highly restrict the growth and development of
  night caused by low night and high day                                                        the specified pest or pathogen under normal pest
  temperatures                                                                                  or pathogen pressure when compared to
                                                                                                susceptible varieties. These plant varieties may,
Control                                                                                         however, exhibit some symptoms or damage
- Maintain favourable temperatures                                                              under heavy pest or pathogen pressure.
- Improve transpiration through ventilation
                                                                                                Moderate/intermediate resistance (IR): plant
Cold stripes                                                                                    varieties that restrict the growth and development
Symptoms                                                                                        of the specified pest or pathogen, but may exhibit
- Yellow or light green strips between ribs                                                     a greater range of symptoms or damage
                                                                                                compared          to        resistant     varieties.
Causes                                                                                          Moderately/intermediately resistant plant varieties
- Night temperatures < 13 °C                                                                    will still show less severe symptoms or damage
- Warm days and cold nights                                                                     than susceptible plant varieties when grown under
- Unstable RH                                                                                   similar environmental conditions and/or pest or
- Low B levels                                                                                  pathogen pressure.

Control                                                                                         Tolerance definition
- Maintain minimum temperature > 15 °C                                                          Tolerance (T): is the ability of a plant variety to
- Stabilise RH                                                                                  endure      abiotic     stress   without    serious
- Apply foliar B and Ca sprays weekly                                                           consequences for growth, appearance and yield.
                                                                                                Vegetable companies will continue to use
                                                                                                tolerance for abiotic stress.




Disclaimer: This information is based on our observations and/or information from other sources. As crop performance depends on the interaction between the genetic potential
of the seed, its physiological characteristics, and the environment, including management, we give no warranty express or implied, for the performance of crops relative to the
information given nor do we accept any liability for any loss, direct or consequential, that may arise from whatsoever cause. Please read the Sakata Seed Southern Africa (Pty)
Ltd Conditions of Sale before ordering seed.
Resistance: is the ability of a plant variety to restrict the growth and development of a specified pest or pathogen and/or the damage they cause when compared to susceptible
plant varieties under similar environmental conditions and pest or pathogen pressure. Resistant varieties may exhibit some disease symptoms or damage under heavy pest or
pathogen pressure (HR = High resistance, IR = Intermediate resistance).
Recent version: Kindly contact Sakata or Area Representative for the most recent version of this Technical Bulletin.

Sakata Seed Southern Africa (Pty) Ltd.                             Copyright: (not to be reproduced)                                Email. info.saf@sakata-eu.com
Tel. +27 11 548 2800                                                    Fax. +27 11 548 2820                                           Website. www.sakata.com

								
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