Variabilidade patogênica e efeito de carboidratos no crescimento micelial, esporula？？o e agressividade de Colletotrichum gloeosporioides da pupunheira

the aggressiveness of 17 colletotrichum gloeosporioides isolates associated with anthracnose on leaves of peach palm (bactris gasiapes) from northern, southeastern and southern states of brazil was evaluated through a bioassay using detached leaves of peach palm, at three stages: young, intermediate and fully expanded leaves. differences on aggressiveness among isolates were significant only on fully expanded and intermediate leaves. different sources of carbohydrates such as glucose, maltose and starch, added to potato-agar medium affected mycelial growth and sporulation of some isolates. among five isolates tested, only two had their aggressiveness increased when conidia were produced on potato-agar medium supplemented with starch.