Blast and Bacterial Diseases of Some Seed-dressed Rice Varieties in Yogyakarta.

Abstract

Pyricularia grisea (blast disease) and bacterial diseases resulted rice yield loss. Tolerant varieties and seed-dressing are expected reduces the disease. This research was aimed to define the effect of tolerant varieties and seed - dressing to the incidence of blast and bacterial diseases. Research was conducted at endemic area in Yogyakarta Indonesia from November 2021 to March 2022. The experiment was designed in randomized block with 2 factors and 4 replications. Factor 1 was variety: Inpari 32 HDB, Inpari 45 Dirgahayu and Inpari 48 Blas as tolerant variety and Sunggal as common variety. Factor 2 was seed treatment: Pseudomonas fluorencens solutions, consortia of antagonist fungi and bacterium, and fungicide Trisiklazol 225 g l−1 and Azoksistrobin 75 g l−1. Results showed that tolerant varieties was significantly reduced blast and BLB. The highest incidence of blast and bacterial diseases were found at Sunggal, while not found at Inpari 45 Dirgahayu and Inpari 48 Blas. Meanwhile, bacterial diseases was found at low level at the 3 tolerant varieties. Bacterial disease found in this research was BLB (Bacterial Leaf Blight), BRS (Bacterial Red Stripe) and BLS (Bacterial Leaf Streak). Result also showed that seed treatment did not affect the reduction of blast and bacterial disease. At other site, highest yield (10.18 ton ha−1) was obtained from Inpari 32 HDB which was treated with consortia of antagonist fungi and bacterium. Hence, the 3 tested tolerant varieties was promising to be established at the endemic area in the agro ecosystem of irrigated rice in Yogyakarta Indonesia.