Large induced trees in sparse random graphs

Abstract We consider the size of the largest induced tree in random graphs, random regular graphs and random regular digraphs where the average degree is constant. In all cases we show that with probability 1 − o (1), such graphs have induced trees of size order n . In particular, the first result confirms a conjecture of Erdos and Palka ( Discrete Math. 46 (1983), 145–150).