The most effective way to reduce larval numbers in your paddocks is by removing the manure regularly. By removing the manure, you’ll keep the eggs from hatching into larvae. In warmer climates and higher summer temperature it is recommended to remove manure every three days. If this is not possible, there are other ways to control worms population in pastures. However, if possible, it is best to avoid using chemical pesticides and fungicides that can impact the environment. You can use pasture plants instead. There are a variety of chemical compounds in those plants that have shown some degree of efficacy against parasites, including thujone and tannin. Another good example of a non-chemical method is pasture rotation. Rotating your animals between pastures every month or so helps keep the parasites under control by limiting the amount of time your animals spend grazing on one particular pasture.