The biological characteristics of pathogenic strain Mds0404 of Curvularia sp.to Diditaria sanguinaris

Factors influenced vegetative growth,conidial germination and sporulation of strain Mds0404 of Curvularia sp.,which was a biological control agent for crabgrass(Digitaria sanguinaris),had been primarily studied.PSA was the best medium for growth of pathogenic strain and PDA was the best for sporulation. The ranges of temperature for mycelium growth was 10-40℃,the optimum was 25-32℃.The range of temperature for fungus sporulation was 20-32℃,the optimum at 25-28℃.The optimum pH for mycelia growth and for the amount of spores produced was pH 5 and pH 8,respectively.The fungus grew and spored better in Czapek medium with sugar as carbon source and KNO3 as nitrogen source.The amount of spore produced most when the medium was lighted under purple lamp covered with membrane away from 25 cm at 12 hours interval.The range of temperature for conidial germination was 10-40℃,the optimum at 25-40℃,the temperature of deactivation was 55℃.Darkness was favor of conidial germination.The percentage of spore germination was still over 50% under UV-light irradiation for 16 minutes.