Made Jana Mejaya
Balai Besar Penelitian Tanaman Padi Jl. Raya 9 Sukamandi, Subang 41256, Jawa Barat

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Wereng Cokelat sebagai Hama Global Bernilai Ekonomi Tinggi dan Strategi Pengendaliannya Baehaki S. E.; Made Jana Mejaya
Iptek Tanaman Pangan Vol 9, No 1 (2014): Juni 2014
Publisher : Puslitbang Tanaman Pangan

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Abstract

Brown planthopper (BPH) is a global rice pest, widespread in the Palaeartik, Oriental, and Australian regions. This pest had caused high losses of economic value, both as yield losses and as funds, to be used for research in the technological control. Both nymphs and adults of BPH are damaging on rice plants, through an extensive sucking of the cell sap. BPH also transmits viruses, thus increases level of BPH infestation occasionally are accompanied by substantial losses of rice crop by virus diseases resulting in hopperburn. Countries most affected by BPH attacks and had spent high number of funds to control are China, Vietnam, Thailand, Philippines, Malaysia, and Indonesia. BPH attack disrupts the nutrient uptake processes occurring on the roots, whereas the rice roots are not only playing a major role in taking up nutrients and water, but also functioning as sites for biosynthesis of substances that affect physiological activities, such as cytokinins, zeatin, and zeatin riboside. Senescence process of the leaves, transportation and distribution of assimilates, grain flling, and grain yield are closely correlated with the function of root systems of the rice plant. Strategy for BPH control includes assembling durable resistance of rice varieties using the available germplasm, tightening resistant line screening, action program such as simultaneous planting based on triangle strategies, increasing the use of light traps to monitor the populations dynamic and reducing insect populations. Control of brown planthopper using insecticides should consider the latest economic threshold, depending on the price of grain at harvest.
Perbedaan Hasil Padi Antarmusim di Lahan Sawah Irigasi Satoto Satoto; Yuni Widyastuti; Untung Susanto; Made Jana Mejaya
Iptek Tanaman Pangan Vol 8, No 2 (2013): Desember 2013
Publisher : Puslitbang Tanaman Pangan

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Abstract

Indonesia as a tropical country, has two distinct planting seasons, i.e. rainy (WS, October-April) and dry season (DS, May-September). The difference between the two seasons include the amount of rainfall, air temperature, humidity, solar radiation, and cloudiness which cause yield gap between seasons. Rice yield testing at various locations and seasons using inbred and hybrid varieties showed the occurrence of yield gap patterns. In East Java during the 2001-2003 testing showed inconsistence yield gap between planting seasons across locations. Testing of 29 very early maturing accessions in Kuningan (550 m asl) during DS 2010 and WS 2010/2011 showed no significant yield gap between planting seasons. Similarly, testing of 10 GSR inbred lines along with four check varieties during DS 2012 and WS 2012/2013 showed no significant yield gap due to seasons, genotypes, and plant spacing. Factors which presumably affected the yield gap include air temperature, CO2 concentration, and solar radiation during grain filling period. Increasing temperature had reduced the grain yield, where as increasing CO2 concentration increased plant biomass formation, while optimum solar radiation during grain filling increased grain yield. To reduce yield gap between seasonal planting, the more readily observable causing the yield gap should be anticipated, such as: pests and diseases in each season for each location, assigning suitable variety for specific location and planting season, and application of most appropriate cultivation techniques for each location and season (fertilizers application, plant spacing, irrigation, and pest/diseases management).