Toxic activity from liquid culture of Colletotrichum acutatum

Colletotrichum acutatum has become an increasingly important plant pathogen worldwide. With this background, a study was carried out to characterize t he toxicity of liquid culture media from different isolates and to identify some properties of the toxic principles. Liquid culture media from all iso lates were toxic to rubber leaves and induced the anthracnose symptoms. Tox icity of the culture filtrate was not host specific and toxic substances we re thermostable. Acetone soluble fraction of the culture filtrates retained the toxic activity and it was effective even at a concentration of 700 mug dry mycelium mass/ml.