Microencapsulated ethoprophos comprising an ethoprophos solution in a vegetable oil with a polycondensate wall membrane, prepared from a resin prepolymer comprising formaldehyde and at least one compound chosen from urea and melamine. This product has a low toxicity for mammals, it has hardly any stimulant odour and preserves the same level of nematocidal activity as ethoprophos itself; it also preserves this activity over a prolonged period by slowly releasing the ethoprophos.
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