toxic

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    • 8ung, falls jemand eine von koa windsong`s dvds zum thema bushtucker oder survival erstanden hat - da scheinen auch ein paar weniger geniessbare sachen als essbar aufgeführt zu sein.
      mahlzeit! :D
    • Hallo stray,

      danke für den Hinweis. Habe diesbezüglich folgende Information gefunden (Quelle: bushfood.net/viewtopic.php?t=1089)

      TOXIC DVDS STILL BEING SOLD

      There's been requests for a follow-up critique of the wild food plant safety on DVDs featuring Koa Windsong.

      Koa admitted publicly (The Northern Rivers Echo 12/11/09) that he had made a mistake by saying that billy goat weed and tobacco bush were "safe" to eat - but months later the DVD Walking Softly with Koa -Part 2 is still being sold in which billy goat weed is clearly shown by Koa as an example of a plant that he considers safe to eat.

      In the DVD Koa justifies billy goat weeds safety based on what is obviously a seriously flawed "edibility test", and bizarrely Koa also says in the DVD that he didn't know the name of the plant (billy goat weed) but still considered it safe.

      The cardinal rule is: if you don't know what it is - don't eat it. There is no such thing as a reliable "universal edibility test" for unknown plants - it's a particularly erroneous and dangerous concept because some plant toxins wont show-up harmful effects in the short term - with the billy goat weed an overt case in point.

      People have eaten billy goat weed on a regular basis because of these DVDs - with the risk of necrotic damage to internal organs as a consequence.

      There are several other toxicity mistakes on the Walking Softly with Koa DVD series, including black nightshade, thickhead, and wandering jew. In a survival situation, or on a regular basis, these poisonous weeds are not safe to eat. For public safety, it's about time this series was withdrawn from sale. As Koa acknowledges, children are heavily influenced by these DVDs - but this is a major worry, as children's lower body weight makes them more vulnerable to poisoning.

      Fortunately, the very problematic DVD Bush Tucker with Koa has been withdrawn from sale. It targeted children specifically - encouraging them to eat poisonous plants like tobacco bush, billy goat weed, Grevillea, grasses and wandering jew. The producers should refund returned copies, as the mistakes are potentially fatal and the DVD should not be in circulation.

      A summary of significant toxicity mistakes in Koa Windsong's DVDs include:

      -Tobacco bush (Solanum mauritianum) - berry.
      Contains high levels of neurotoxic glycoalkaloids in the ripe and unripe berries. Fatalities have been recorded. DVD: BT with Koa.

      - Billy goat weed (Ageratum houstonianum, A. conyzoides) - flowers.
      Contains a suite of toxins, including coumarins, triterpenes and pyrollizidine alkaloids. Causes necrosis of internal organs. Cases of liver damage linked to mass poisoning. DVDs: BT with Koa, Koa 2.

      - Black nightshade (Solanum nigrum, S. americanum) - berry.
      Contains variable and sometimes very toxic levels of glycoalkaloids in the ripe and unripe berries. Also, a high risk with unknown toxicity levels in the native black nightshades. DVD: Koa 1.

      - Grevillea (Grevillea spp.) - nectar (flower).
      Many garden varieties are highly allergenic because of a very similar toxin to what is in "poison ivy" - risk of throat closure and anaphylaxis. Flowers also contain hydrogen cyanide. DVD: BT with Koa.

      - Wandering jew (Tradescantia fluminensis) - tips.
      Contains an unknown but very allergenic compound. Risk of throat closure and anaphylaxis for sensitive people. Confuses toxic wandering jew with edible scurvy weed. DVDs: BT with Koa, Koa 1.

      - Thickhead (Crassocephalum crepidioides) - leaf.
      Contains the liver toxin, jacobine, and shouldn't be eaten regularly. DVD: Koa 3.

      - Grasses (Poaceae family) - seed and leaf.
      Some grass species contain potentially fatal toxins. DVD: BT with Koa.

      - "Universal edibility test"
      Faulty and dangerous - many plant toxins will not show-up in self-administered field tests. Potent neurotoxins are not always skin irritant, and some toxins have delayed poisoning effects. DVD: Koa 2, Koa 3.

      NB The dust-jacket on Koa 1 has a disclaimer about over-generalizations on wild food plants - but it's not clear which plants are being referred to. Dust jacket disclaimers are inadequate because the reality is that DVDs get copied and separated from dust-jackets.