ANTAGONISM OF ACREMONIUM MUCRONATUM TOWARDS DIPLODIA-MUTILA IN TESTS IN-VITRO AND IN-SITU

Tests in vitro and in situ showed that both mycelial and conidial susp ensions of Acremonium mucronatum were antagonistic for Diplodia mutila , a common pathogen on the apical twigs of declining Quercus cerris, Q uercus frainetto, Quercus pubescens and Quercus robur. Antagonism was greater with the mycelium than with the conidial suspensions, and was strongest at a test temperature of 20 degrees c. The results suggest t hat pathogenicity of D. mutila on declining trees may be significantly reduced by the presence of A. mucronatum.