Plant extract screen finds five leads against sheep nematodes

Larvicidal plant extract screen identifies five promising sheep parasite candidates

Small-ruminant parasite research got a useful new data point this month: a Frontiers in Veterinary Science study led by Chao Ke screened aqueous extracts from 24 plant species against ovine gastrointestinal nematode larvae in vitro and found five species that produced at least 90% larval mortality at 48 hours. The paper adds to a growing body of work exploring plant-derived anthelmintics as alternatives or adjuncts to conventional dewormers, especially as resistance to synthetic anthelmintics continues to pressure sheep production systems. Frontiers lists the article as published in its Parasitology section in April 2026. (frontiersin.org)

Why it matters: For veterinary professionals working with sheep and goats, the study is another sign that botanical parasite-control tools are moving from ethnoveterinary tradition toward more systematic screening. That said, the broader literature still shows a familiar gap: many more plant products have demonstrated activity in vitro than in vivo, and integrated parasite management remains the consensus path forward rather than replacing standard dewormers with plant products alone. Reviews and recent sheep studies note that plant-based compounds may have value, but they also emphasize the need for dose optimization, toxicity work, formulation development, and field validation before routine use. (frontiersin.org)

What to watch: The next step is whether the five lead extracts advance into in vivo efficacy, safety, residue, and formulation studies that could make them practical tools for flock-level parasite control. (bmcvetres.biomedcentral.com)