Rodent season is here, and with it comes a new set of challenges for farmers and pest controllers across the UK. With recent legislation changes and stricter stewardship rules, the products you choose now matter more than ever. Lodi UK’s Harmonix Rodent Paste offers a compliant, effective and forward-thinking solution for tackling rodent infestations for both indoors and outdoors.
What is Harmonix Rodent Paste?
Harmonix Rodent Paste is a professional-use rodenticide containing the active ingredient cholecalciferol, a non-anticoagulant mode of action. Unlike traditional SGARs (second-generation anticoagulant rodenticides), Harmonix works by disrupting calcium balance in the rodent’s body. This unique reaction results in rapid control and helps manage resistance, making it an essential tool for farmers who face persistent rodent activity.
The paste itself is highly palatable and designed for quick uptake, even when alternative food sources are available. Its registration covers indoor and outdoor use, including open areas, waste dumps, and direct burrow baiting, making it one of the most versatile rodenticides on the market. With Harmonix, professional users can continue to operate efficiently and within current legal frameworks, even in areas where SGAR use is now prohibited.
Legislation Changes: What Happened on 1 January 2025
From 1 January 2025, major changes came into effect across the UK rodenticide industry. Under updated CRRU UK guidelines, SGARs can no longer be used outdoors and in open areas. These restrictions aim to reduce environmental risk and potential secondary poisoning of non-target wildlife. SGARs are now limited to indoors and outside around building perimeters.
This means that any site requiring external control such as farms, waste sites, feed stores, or embankments, can no longer rely on anticoagulant baits. Professional rodenticide users must instead turn to alternative actives that carry the appropriate authorisations for outdoor use.
Why Harmonix is the Solution
Harmonix Rodent Paste is authorised for use outdoors in open areas, waste dumps, and direct burrow applications, alongside standard indoor and around-building treatments. Because it is not an SGAR, Harmonix does not fall under the same restrictions and remains legal for outdoor open area use when applied according to the label. Giving you the confidence of a compliant product without compromising on results. An innovative and flexible solution to rodent problems which LEFT untreated can lead to property damage, fire risk, and costly repairs.
Experience Harmonix, market leading and here’s why…
- Expert Rodent Control
- Exclusive Formulation
- Exterior Use
Twice the speed, half the bait. Harmonix’s active ingredient, cholecalciferol, has another distinct advantage as the risk of secondary poisoning to non-target species is reduced because the active ingredient is bioaccumulative and non-persistent in the environment. This makes Harmonix a valuable tool where wildlife sensitivity or stewardship obligations are a concern. By using Harmonix, pest controllers can effectively manage infestations while minimising environmental impact.
The Next Big Change: 1 January 2026
Another critical date is fast approaching. From 1 January 2026, anyone purchasing or applying professional rodenticides must have their RSPH Level 2 in the Safe Use of Rodenticides. This rule applies across the board, meaning that Red Tractor and Farm Assurance certificates alone will no longer be accepted as proof of competence.
Without a valid qualification, you will be unable to legally buy or use any professional-strength bait, including Harmonix and the Lodi Gems range. This update is part of the CRRU UK’s ongoing commitment to improving responsible rodenticide use, ensuring that every professional using these products understands best practice, environmental protection, and correct application methods.
At Lodi UK, we understand how crucial this is for those working in pest control and agriculture. That’s why we’ve partnered with LANTRA to help users complete their RSPH Level 2 training easily and efficiently. The course can be taken online, offering flexibility for busy farmers who want to stay compliant and continue using professional-grade baits after the deadline.
Best Practice: Getting the Most from Harmonix
Before any baiting begins, a full site survey should always be carried out. Identify harbourage points, food and water sources, and potential travel routes. Remove as many attractants as possible, such as spilled feed or waste, to encourage rodents to take the bait. Proofing measures, like sealing entry points and securing drains, should be implemented alongside baiting for long-term control.
When using Harmonix, correct placement is key. For rats, place bait along walls, near burrows, and around sheltered areas where activity is evident. For mice, increase the number of bait points but reduce spacing to suit their smaller home ranges. Always follow the label instructions carefully and use tamper-resistant bait stations.
For outdoor and burrow applications, confirm that burrows are active before treating. Place bait directly into the burrow and securely close the entrance to prevent access by non-target species. Mark treated burrows and monitor them frequently until no further signs of activity are seen.
Integrating Harmonix into a Wider Rodent Control Plan
Rodent control isn’t just about bait, it’s about integration. Harmonix should form part of a broader pest management plan that includes good hygiene, environmental management, and physical controls. Combining Harmonix with trapping, proofing materials, can significantly improve long-term success.
For example, once a rodent population has been controlled using Harmonix, using products like Lodi’s anti-rodent sealant, and spray will help secure vulnerable areas and prevent re-infestation. This layered approach ensures that infestations are not only removed but kept under control throughout the year. Prevention is always better than cure!
Stewardship and Safety
The CRRU Code of Best Practice should always be followed when using any rodenticide, including Harmonix. Use the minimum amount required to achieve control, remove bait once the treatment period is complete, and collect any carcasses to prevent secondary exposure. Risk assessments should be carried out on all sites, especially those close to watercourses or sensitive habitats.
Because Harmonix’s cholecalciferol active presents a reduced risk of secondary poisoning,, it is particularly well-suited to environments where non-target safety is a top priority. This stewardship benefit, alongside its outdoor approval, makes Harmonix a standout choice for compliance-minded individuals.
Why Choose Harmonix This Season
Proven rodent control within 7 days with 50% less bait. With rodent pressure increasing and stewardship rules tightening, Harmonix offers a proven and future-proof solution. It delivers fast, reliable control while staying fully compliant with both current and upcoming legislation. For farmers, it’s a safeguard against compliance issues while protecting feed stores, machinery sheds, and livestock housing.
The landscape of rodent control is changing quickly, but by adopting Harmonix and ensuring your RSPH Level 2 qualification is complete before 2026, you’ll be well prepared for whatever comes next.
At Lodi UK, we’re here to help you every step of the way, from supplying innovative rodenticides, a one stop shop of rodent control products, to supporting your training journey with LANTRA. For more information about Harmonix Rodent Paste, or to get started with your professional rodenticides certification, visit our website or contact our team today.
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