EFFECTIVENESS OF CULTIVATION AND ANTHRACNOSE CONTROL OF Trichoderma harzianum on GREEN ONINON PLANTS

Abstract

Anthracnose caused by Colletotrichum gloeosporioides is a common disease on green onions in tropical and subtropical countries. Now, most fanners apply chemical pesticides to manage onion anthracnose disease, resulted in bad effect to human health and environment. Therefore, the study was conducted to evaluate the biological control ability of Trichoderma harzianum against onion anthracnose. The results showed that T. harzianum increased biomass at pH = 5.5 and the medium of coconut water. The best increase in root length, shoot height and weight when soaking onion plants in T. harzianum spore suspension for 30 minutes, gained 0.44 cm respectively; 0.44 cm; 0.43 g, respectively. The best disease index reduction of T. harzianum at 7 days, 10 days and 14 days after inoculation were 28.93%; 28.79%; 29.28%, respectively.