Effect of volatile components from Eupatorium adenophorum against spore germination and mycelium growth of two fungal pathogen

The volatile components extracted from Eupatorium adenophorum fresh leaves and leaves intimidated by toxins from Lecanosticta acicola by steam distillation. Results showed that 1)volatile components producing by fresh leaf before stress and detached leaf after stress could both accelerate spore germination of Pestalotiopsis sp. and Alternaria alternate, promoting effect of the latter was better than that of the former; 2) Both of them could inhibit mycelium growth of Pestalotiopsis sp. but induce mycelium growth of Alternaria alternate. In summary, inducing volatile substances were beneficial for invasion and extension of pathogen, accelerate disease occurrence and development. So it should be paid more attention to the toxins exploitation as a biocontrol agent for toxinspathogen cooperative control the weed.