TunnelFind | Basic definitions relating to tunnel farming | Tunnel Farming in South Africa
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Below is a list of some of the definitions relating to tunnel farming. If you would like to add a definition, please submit it via the comments box at the bottom.

 

  • Anamorph: The asexual form in the lifecycle of a fungus. Asexual spores (conidia) are usually produced.
  • Anthesis: The point at which the flower is fully open.
  • Ascospore: Sexually derrived fungal spore usually held with many other ascospores in a sack-like structure (ascus)
  • Bacteria: Microscopic, single-celled organisms
  • Blight: The disease symptoms in which there is a sudden and severe necrosis of the above ground portions of the plant (Tomato Diseases - The Hybrid Vegetable and Seed Company:1997)

    • Early Blight - Appears on the older leaves of the plant and they develop black rings on the leaves. The leaves go from dark brown/yellow and will eventually wither away into nothing.
    • Late Blight - The stems and leaves are irregular in shape. Water soaked patches will appear and will enlarge and turn brown and paper-like. Occurs mainly in warm and moist conditions.
  • Blight Forecasting System: The act of identifying a particular blight condition based on symptoms.
  • Calyx: The external green leafy part of the flower consisting of sepals
  • Chlorophyll: The green pigment used by plants in their food producing process
  • Concentric: Difference sized circles having a comon centre
  • Damping-Off: A rotting of seedlings at or below soil level
  • Defoliation: The loss of leaves
  • EC Tester: A testing instrument which stands for Electrical Connectivity. You use it to test the water for nutrition-based planning and management
  • Fungicide: A chemical used to control fungus
  • Fungus: Microscopic organism that grows on living and/or dead plants.
  • Herbicide: A chemical used to control weeds
  • Infection: The process in which an organism attacks the plant
  • Instar: An insect stage before it reaches adulthood
  • Lesion: A well defined but limited diseased area on a plant
  • Mineral Oil: a product used to atomise in your tunnel usually mixed with water for the treatment of diseases.
  • Mosaic: The pattern of light and dark areas on a plant, typically the leaf, often caused by viruses
  • Mottle: Irregular blotches of light and dark areas on a plant, typically on the leaf.
  • Necrotic: Tissue that turns brown and dies
  • Nematode: Tiny worms that can live in plants, animals, soil or water
  • Pathogen: An agent that causes disease
  • pH Tester: A testing instrument to measure the acidity or alkalinity of the water
  • Pith: Soft, spongy tissue at the centre of the stem
  • Rootstock: A root used as stock to which another plant is grafted
  • PPM: Parts per million
  • Runoff: The excess water that filters through the bottom of the plant bag when irrigating. This should not be more than 25% of total water applied. There must however always be runoff when irrigating
  • Saturation: Being completly filled with liquid, generally water
  • Solarization: Exposed to direct sunlight
  • Spore: The reproductive structure of fungi and some bacteria
  • Systemic: Spreading internally throughout a plant
  • Translocation: The transfer of nutrients or a virus through the plant
  • Transpiration: The loss of water vapour from the surface of leaves
  • Watersoaked: Tissue having the appearance of being soaked with water
  • White fly: a pest which wil usually start eating away at plant leaves. They are also carriers of other diseases. The common size is about 1mm and they generally don't fly big distances and therefore are aided in movement in a breeze. Their lifespan is aproximately 20days but they grow and multiply incredibly quickly.
  • Xylem: The water conducting tissue of a plant
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