Very little experience with horses but the basic fundamentals of livestock management in Organic systems still apply. Only if the horse is healthy on good pasture etc,etc, will quick fix methods such as potatoes!!!? apply. They in effect act as an additional tonic which adds that extra level of protection.
Hope this helps.
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A traditional and effective method is to use 15mls of raw linseed oil with 7mls of Pine Tree (vegetable) Turpentine (NOT MINERAL TURPS) once a day for three days, may be necessary in heavy infestations - fast overnight before drenching - this quantity is for a calf - multiply the amount proportionally by body weight. In very severe cases of infestation 1/2 teaspoon full of coppersulphate in 120mls of water, properly dissolved - per animal - repeated after 10 days - and a further 10 days - to break the worm cycle. For a calf half this amount. Very effective. Add crushed garlic to drinking water with some cider vinegar.