Long spelling periods are required for pasture to become free of contamination by infective larvae of Haemonchus contortus in a humid subtropical climate of São Paulo state, Brazil

Fabiana Alves de Almeida, Ana Cláudia Alexandre de Albuquerque, César Cristiano Bassetto, Renan Zappavigna Costa Starling, José Gabriel Gonçalves Lins, Alessandro Francisco Talamini do Amarante