The study aimed to determine the effect of liquid bio fungicides dosage Trichoderma spp. Against Fusarium wilt diseases, growth and yield of onion. This study used an experimental method with experiments on field conditions carried out in Sembalun Bumbung Village Sembalun District East Lombok Regency from May to August 2018. The experiment used a Randomized Block Design with liquid bio fungicides Dosage Trichoderma spp. which consists of 9 treatments, namely, 0 ml / plant, 2.5 ml / plant, 5 ml / plant, 7.5 ml / plant, 10 ml / plant, 12.5 ml / plant, 15 ml / plant, 17, 5 ml / plant and 20 ml / plant. Each treatment was repeated three times so that there were 27 experimental units. Experimental parameters included the percentage of disease incidence, plant growth (height and number of plant leaves), and yield of onion (number of tillers and weight of harvested onion). Data were analyzed using Analysis of Variance at 5% level and Honestly Significant Different Test at 5% level. The results showed that Trichoderma spp. can increase the induced resistance of onion to Fusarium wilt diseases and increase the growth and yield of onion. The conclusion of this experiment is liquid bio fungicides Trichoderma spp. starting with a dose of 5 ml/plant caused the onion plants not infected with Fusarium wilt diseases. Similarly, at the starting dose of 5 ml/plant increase the weight of harvest onion.

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