Methods for modulating the expression of target Gene in Plants expressing a recombinant precursor microRNA. Also the use of such precursor microRNA recombinant nematode control, particularly the control of soybean cyst nematode. In addition the introduction of genetic material in plants that are susceptible to nematodes to increase resistance to nematodes.Claim 1: an isolated Nucleic Acid Molecule comprising a Nucleic Acid Molecule from the group consisting of (i) a Nucleic Acid Molecule represented by SEQ ID no. 1 and II) a Nucleic Acid Molecule with at least 100 Base pairs of consecutive Described by a sequence of SEQ ID no. 1 and (iii) a Nucleic Acid Molecule with an identity of at least 70%On a sequence of at least 100 consecutive base pairs of nucleic acids in a sequence as SEQ ID no. 1 and (iv) a Nucleic Acid Molecule with at least 100 pb that hybridize in Harsh conditions with a Nucleic Acid Molecule with at least 100 Base pairs consecut "Of a Nucleic Acid Molecule described by any of SEQ ID no. 1 and (V) an Acid Molecule nuCleico capable of forming a secondary Structure similar to the secondary Structure formed by SEQ ID no. 1 (VI) The complement of any of the sequences as defined in (i) to (V).Métodos para modular la expresión del gen objetivo en plantas al expresar un precursor microARN recombinante. También el uso de dichos precursores microARN recombinantes para el control de nemátodos, en particular el control de nemátodos de quiste en soja. Además la introducción de material genético en plantas que son susceptibles a los nemátodos a fin de aumentar la resistencia a los nemátodos.Reivindicación 1: Una molécula aislada de ácido nucleico que comprende una molécula de ácido nucleico comprendido en el grupo que consiste en i) una molécula de ácido nucleico representado por SEQ ID Nº 1 y ii) una molécula de ácido nucleico con al menos 100 pares de base consecutivos de una secuencia descrita por SEQ ID Nº 1 y iii) una molécula de ácido nucleico con una ident
