How to make an herbicides made of pine leaves?
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Pine oil is an oil obtained by the steam-distillation of pine (Pinus sylvestris - Scotch Pine) needles, twigs and cones.
It has a relatively low human toxicity level, a low corrosion level and limited persistence. This makes many pine oils a perfect herbicide, as they also contain the hydrocarbon terpene, which is the active constituent in the organic herbicide Organic InterceptorTM, produced by Certified Organics Ltd of New Zealand. Organic Interceptor is a non-selective herbicide (as is, for instance, Glyphosate).
Pine needles, you mean? I didn't even hear about it, but I suppose it is like making compost tea. Let the needles soak in water for several days. Longer is you want it stronger, and then filter them out. Use the solution for what you intended.
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