THE EFFECT OF GLIOCLADIUM VIRENS(GVP) ON THE DAMPING-OFF OF CUNNINGHAMIA LANCEOLATA SEEDLINGS CAUSED BY RHIZOCTONIA SOLANI

Among 17 carriers,corn-powder with cob-powder carrier was found the most suitable for growth and sporulation of Gliocladium virens(GVP).In both pot experiment(sterile soil) and field plot trial(natural soil),either the GVP preparation alone or its combination with a low dose(10mg/kg soil) of PCNB was effective in controlling post-and pre-emergence damping-off of Cunninghamia lanceolata seedlings causcd by Rhizoctonia solani,and the latter was superior to the former.Two weeks after the addition of the GVP preparation to sterile soil,population of the GYP increased up to 10⁸ and that of R.solani suddenly declined and then the two gradually decreased respectively.At last,population of the GVP fluctuated from 10⁵ to 10⁶ and that of R.solani was kept in a very low level.