| Summary: | Rice Leaf Folder and Narrow Brown Spot cause yield losses of rice production. Environmental factors are suggested effects the severity of them. This research was aimed to determine the effect of plant density and water management to the severity of these pest and disease in the agro ecosystem of irrigated paddy field. Research was conducted using Inpari 44 variety in Godean Sleman Yogyakarta, April to July 2020. Experimental design was randomized block design with 4 treatments and 4 replications. Treatments were plant density (high = 50 kg ha-1 and low = 25 kg ha-1) and water management (alternate wetting and drying/AWD, and continues flooding). Results showed that highest attack intensity of leaf folder (25%) was occurred in 42nd days after planting in high plant density with AWD. Meanwhile, highest severity of narrow brown spot (58%) was found in 63rd days after planting in plant with low density and continues flooding. High leaf folder attack intensity was caused by high plant density, but not effected by water management. At the other side, high severity of narrow brown spot was affected by water management, but not effected by plant density.
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