Trigerrs Logic problem with collision damage

Hello everyone I´m developing a runner game and my problem is when the character colide with the obstacle, the character receive two damage, because the character have 2 collider,the collider of the obstacles and the collider of the cheackground to know when he needs to jump or die.

the life sistem is simple hava two lifes when he is collide lose 1 if he collide two times he dies.But because the two colliders every time the character receive 2 damage, so i want to know exist some form to me cancel the checkground collider when checkground collide with the obstacle.

the code is this:

void OnTriggerEnter2D(Collider2D verif){

     if(verif.gameObject.name == "Bandeira"){
         Application.LoadLevel("Play");

     }
     else{
         Debug.Log("Barreira");
         StartCoroutine("DeathParticleDelay");
     }
 }

 void Movimentacao(){
     transform.Translate (Vector2.right * velocidade * Time.deltaTime);
 }

 public IEnumerator DeathParticleDelay (){
     Debug.Log(currentHealth);
     if(currentHealth >=0){
     currentHealth -= 1;
     Debug.Log(currentHealth);
     Instantiate(deathParticle,PosiPlayer.transform.position,PosiPlayer.transform.rotation);
     }
     if(currentHealth <0){
     Debug.Log(currentHealth);
     Instantiate(deathParticle,PosiPlayer.transform.position,PosiPlayer.transform.rotation);
     //faz o personagem sumir
     jogador.GetComponent<Renderer>().enabled = false;
     PlayerPrefs.SetInt("pontuacao",pontuacao);
     if(pontuacao > PlayerPrefs.GetInt("recorde")){
         PlayerPrefs.SetInt("recorde",pontuacao);
     }
     morte = true;
     yield return new WaitForSeconds(GameOverDelay* Time.deltaTime);
     if(morte == true){
         Application.LoadLevel("GameOver");
         }
     }
 }

Thanks