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 the toxicity of liquid culture media from different isolates and to identify some properties of the toxic principles. Liquid culture media from all isolates were toxic to rubber leaves and induced the anthracnose symptoms. Toxicity of the culture filtrate was not host specific and toxic substances were thermostable. Acetone soluble fraction of the culture filtrates retained the toxic activity and it was effective even at a concentration of 700 microg dry mycelium mass/ml.