Procedure to protect against arthropod pests a seed or the body of a plant that grows from the seed. An excellent method is provided for the prevention of arthropod pests to protect against a plague of arthropods a seed or the body of a plant that grows from the seed. A method for protecting against a plague of arthropods a seed or the body of a plant that grows from a seed, comprising the steps of: a) forming a groove in the earth； b) comprising placing in the groove formed in the previous step a seed that preserves triacloprid at least on its surface and applying to the groove formed in the previous step a pesticidal composition comprising one or more synthetic pyrethroid compounds selected from group i； and c) closing the sulcus, wherein group i consists of esfenvalerate, beta-cypermethrin, theta-cypermethrin, deltamethrin, fenpropathrin, tau-fluvalinate, beta-cyfluthrin, acrinatrin, alpha-cypermethrin, bifenthrin, cyproprotrin and etofenprox. (Machine-translation by Google Translate, not legally binding)
