T. Tallante Well-Known Member. The poisonous effect of ragwort on a horse is cumulative - a small amount of the plant eaten over a long time is just as dangerous as a lot being eaten in just a few days. Pretty as a yarrow, tansy ragwort looks quite innocent, and it would be hard to find a sturdier plant. Composted horse manure can also be used in the garden any time of the year. See How toxic is Ragwort . Livestock are accidentally poisoned when yew trimmings, or wreaths made of yew, are thrown onto manure piles or over a fence, where they are easily accessible to horses, cattle, sheep and/or goats. Because ragwort is hard to control once it has established itself in a horse pasture, it is important to prevent the plant from settling. New Ragwort Control Act Is Now Law: Common Ragwort is one of five injurious weeds and until recently was covered by the provisions of the Weeds Act 1959 making it the responsibility of landowners to help prevent the spread of this dreadful weed, so Farmers, Horse owners, Local Authorities, Network Rail and the Highways were all affected. Ragwort - Senecio jacobaea - contains a group of deadly toxins. Horses, ponies, donkeys, mules and cattle are more susceptible to ragwort poisoning than other livestock, and young animals are more at risk than older ones. Unfortunately, at present there’s no conclusive answer to this question. Lounge Archive. Ragwort poisoning in horses causes chronic, progressive liver failure. Alsike clover, in either hay or pasture form, is poisonous to horses. The good news, of course, is that the vast majority of those plants pose little threat to horses. Common sense would suggest that its poison would only affect animals likely to graze on it. Oleander contains a poisonous principle similar to digitalis in its effect on the heart, causing arrhythmia and cardiac arrest. Spring is the best time for spraying ragwort as the weeds are at rosette stage and it is far easier to control. Forum Archive. Ragwort is one of the five plants covered by the Weeds Act 1959. The best thing to do is kill if off with round up and reseed it. That’s why it's not unusual to see horses in fields chomping on grass but leaving the ragwort – clever things. MYTH: A tiny amount of Ragwort will kill a horse or a cow. FORUM HELP. If there are more rosettes than you can remove A horse would have to eat its own weight in Ragwort in order for irreversible liver damage (and failure leading to death) to occur. Ragwort is mildly poisonous, but the taste of the plant is usually off-putting to livestock. Ragwort is rarely a problem in gardens but may occur in pony paddocks, railway embankments and areas of unimproved pasture. Equifest Chat. Newbie Area. Cutting, wilting and the treatment with herbicides make ragwort less unpalatable to livestock and poisoning mainly arises from eating contaminated hay. Thread starter Tallante; Start date 14 July 2009; 14 July 2009 #1. The heat produced from composting can effectively kill most of these seeds as well as any harmful bacteria that may be present. Horses may also eat ragwort if there is no grass, or much of anything else to eat, in the field. horse). It is potentially deadly to livestock, especially cattle and horses. Selective herbicides such as 2.4.D and MCPA do not kill grass and are therefore preferable. Lists of qualifiers. Ragwort is poisonous to horses and cattle and because it has a cumulative toxic effect it is difficult to spot ragwort poisoning before it is too late. I would like to start a thread for discussion. Only affect animals likely to graze on it recent event, in field! Ragwort that ’ s no conclusive answer to this question kill horses within 24 hours of.... 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