Internal colonization of the plant by the fungus was shown by re-isolating the fungus from leaves, petioles and stems of the plant that were not the initial site of inoculation. Results indicated that significant differences (at P = 0.05) were obtained in mean % successful re-isolation of the fungus from leaves, petioles and stems at 2, 3 and 4 weeks after inoculation. To assess the endophytic effect of the fungus, larvae of P. xylostella were introduced onto plant leaves distant from the initial site of inoculation with the fungus (one leaf per plant).