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This product is extremely fast acting, even at low temperatures, and the effects are long-lasting. The active ingredient leaves no brown rust spots behind and once the application is dry it is safe for children, dogs and cats to be allowed back into the treated area. 1. Untreated path 2. Treated path. An active ingredient which is found naturally All Neudorff Weedkillers* contain the active ingredient pelargonic acid which is a naturally occurring compound. For example, it can be found in geraniums. It is a long chain fatty acid possessing particularly good environmental properties. When the products are applied to plants, the active substance penetrates the wax layer of the leaves subsequently destroying the walls of the outer plant cells.
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