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Bacterial leaf blight on lowland rice caused by Xanthomonas oryzaepvoryzae (Xoo) is still an important disease. Yield loss could reached 30-40%. This research was carried out in the experiment station and the plant disease laboratory, Faculty of Agriculture, Syiah Kuala University, Banda Aceh with the aim to determine the effect of mycorrhiza in controlling bacterial leaf blight on paddy rice plants. The design used was completely randomized design (CRD). Application of mycorrhiza as treatment consists of four dosage levels: 0 gram, 10 gram, 15 gram, and 20 gram per crop. Inpari 10 cultivar paddy wasusedas indicator plants. The results showed that mycorrhiza affected the incubation period of bacterial leaf blight, length of lession, disease intensity, plant height, and number of tillers of Inpari10 cultivars. The longest incubation period was obtained in the application of mycorrhiza as much as 15 grams per plant (10.33 days) and 20 grams per plant (10.12 days) after inoculation of Xoo bacteria. The shortest length of lession was obtained in the application of mycorrhiza in 20 grams perplant (2.45 cm) and the longest was obtained in plants that were not given mycorrhiza (5.05 cm). The highest disease intensity was obtained in plants that were not given mycorrhiza, namely 25.18% and the lowest in plants that were given mycorrhiza as much as 15 grams per plant and 20 grams per plant, namely 17.29 and 16.51%. The incubation period did not inhibit height growth (r = 0.399 ** and tillers formation (r = 0.348 **) Inpari cultivar paddy rice 10. But the length of the lesio inhibited plant height growth (r = - 0.618 **) and tillers formation (r = - 0.612 **) as well as the intensity of the disease inhibiting the growth of plant height (r = - 0.618 **) and the formation of tillers (r = - 0.584 **).