10 Best Caterpillar Killer 2025 in the UK

The TOPBUXUS XenTari caterpillar killer stands out as a biological solution specifically targeting box tree caterpillars, making it ideal for gardeners dealing with this particular pest. It boasts a quick action formula, causing caterpillars to stop feeding within an hour, which effectively minimizes damage to boxwood plants. The product is user-friendly with straightforward application instructions, requiring no scales, and allows for efficient treatment of up to 150m² with its highly concentrated formula.

Furthermore, its natural composition featuring Bacillus thuringiensis makes it environmentally friendly and safe for bees and birds, catering well to eco-conscious users. The treatment is designed to be applied once per boxwood moth cycle, up to three times per season, which aligns with typical pest management practices and minimizes the need for frequent applications. However, the specificity of its target means it may not be suitable if you have broader pest issues beyond caterpillars.

Additionally, while it offers long shelf life when stored properly, the requirement for specific storage conditions might be inconvenient for some users. With positive customer reviews and high rankings, it demonstrates reliability and effectiveness, although potential buyers should consider its limited pest scope and storage needs when deciding. This caterpillar-killer would best suit those looking to protect boxwood plants specifically, without harming beneficial insects or the environment.

The BugClear Ultra 2 Insecticide is a versatile and effective solution for gardeners dealing with a wide variety of pests, including caterpillars. This concentrate contains rapeseed oil and pyrethrins, making it a non-neonicotinoid option, which is generally safer for beneficial insects and the environment. Its formulation in liquid form allows for easy application on flowers, roses, ornamental plants, and shrubs.

The product is effective against pests at all stages of their lifecycle, from eggs to adults, providing comprehensive control over infestations. Gardeners will appreciate its broad-spectrum efficacy against aphids, greenflies, blackflies, mites, whiteflies, scale insects, mealy bugs, lily leaf beetles, and leaf hoppers in addition to caterpillars. One of the main strengths of the BugClear Ultra 2 is its dual active ingredients, which enhance its effectiveness.

The concentrate's 200 ML volume is suitable for home gardeners, though it might require more frequent application depending on the pest pressure and plant coverage area. Users have rated it highly, with an average rating of 4.4 out of 5 stars across 660 reviews, indicating satisfaction with its performance. However, it is important to note that, as with any chemical insecticide, users should follow application instructions carefully to avoid potential damage to plants and minimize environmental impact. BugClear Ultra 2 is USDA-approved, adding an extra layer of trust for users concerned about safety and efficacy. This insecticide is a solid choice for those looking to protect their gardens from a wide range of pests, including caterpillars, with the additional reassurance of being a non-neonicotinoid product.

The Thuricide HPC BT 8oz Caterpillar & Worm Control by Southern Ag is a product designed for lawn and garden use, aimed at controlling caterpillars and worms. One of its main strengths is the active ingredient, Bacillus thuringiensis (Bt), which is known for its effectiveness in targeting caterpillars without harming beneficial insects, plants, or the environment. This makes it a safe option for organic gardening and environmentally conscious users.

The liquid formulation allows for easy application, ensuring thorough coverage of the affected areas. Users generally appreciate the product's efficiency, as reflected in its high customer rating of 4.6 out of 5 stars from 876 reviews, indicating strong user satisfaction. Its compliance with USDA specifications adds credibility to its quality and safety standards.

However, the product's small liquid volume (8 oz) might require frequent purchases for larger gardens, which could be a drawback for some users. Additionally, while it is effective against caterpillars and worms, it may not cover a broader range of pests, limiting its versatility. Thus, Thuricide HPC BT 8oz is a reliable and safe caterpillar control product, particularly suitable for small to medium-sized gardens and environmentally conscious users, but it may require repeated purchases for extensive areas.