Stem Borer Attack on Growth and Yield of Rice (Oryza sativa L.) in Bali, Indonesia
I.B.K. Suastika, I.B.G. Suryawan dan S.A.N. Aryawati

Assessment Institute for Agricultural Technology of Bali Indonesia


Abstract

Research was conducted in subak Guama, Selanbawak Village, Marga District, Tabanan Regency from January up to April 2017 and subak Dlod Sema, Sading Village, Mengwi District, Badung Regency from Januari up to Mayi 2017. This study aims to understand the growth, productivity and resistance to stem borer pest of superior rice varieties cultivated in Bali Province, Indonesia to substitute Cigeulis and Ciherang. Research was arranged in Randomized Block Design with some superior rice varieties as treatment namely Inpari 30 and Inpari 40 in Tabanan Regency, and also, Inpari 16, Inpari 24, Inpari 28, Inpari 30, Towuti and Situ Bagendit in Badung Regency. Meanwhile, Cigeulis and Ciherang were used as comparison. Each treatments was replicated 5 times. Parameters observed consist of growth and yield components such as plant height, number of tillers, number of grains per panicle, 1000 grains weight and yield. In addition, resistance to stem borer was also observed by record plant damages caused by stem borer using scoring technique. Result showed that Inpari 30 and Inpari 40 were seem to resistant to stem borer with percentage of damage were 7.5% and 1.0%, respectiely. The damages were in the light category and had a chance to be developed in the subak Guama, Tabanan Regency as a substitute for the Ciherang, since the production of Inpari 30 was 6.86 t/ha harvested dry grain (HDG) and Inpari 40 was 6.93 t/ha compared to 6.44 t/ha of Ciherang. Inpari 30 also has an opportunity to be developed in the subak Dlod Sema, Badung Regency with percentage of damages was 10%, it be included light category. The production of Inpari 30 was 6.08 t/ha compared to Ciherang was 4.35 t/ha. Inpari 30 and Inpari 40 can be cosidered as candidate to substitute Ciherang based on their agronomy performances and productivity, they were greater than Ciherang. moreover Inpari 40 was more suitable to substitute Ciherang based on its agronomy performances, productivity and resistance.

Keywords: rice, resistance, stem borer, Ciherang substitute, superior variety, productivity

Topic: Integrated Pest and Disease Management

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