Judul: Analisis faktor kunci penyebab ledakan populasi hama wereng coklat nilaparvata lugens stal di Kabupaten Klaten
Abstrak: Population outbreak of brown plant hopper, Nilaparvata lugens, occured agains in 2010-2011 due to undeterminated keyfactors. Surveillance involving landscape-based observation and farmer interview has been conducted in order to analysize environmental factors and agricultural practices related to population outbreak in Klaten Regency. Key factors related pest outbreak in Klaten regency are rice varieties, presence of predators asa well as entomopathogenic fungi and colonization of endophytic fungi in rice, presence of other pests, active ingredient of insecticides, interval of spyaying and nitrogen fertilizer.
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Judul: Analisis Fakor Iklim terhadap Penyebaran Hama Wereng Batang Coklat (Nilaparvata lugens Stal.) pada Tanaman Padi di Kabupaten Cianjur
Abstrak: Penelitian ini bertujuan menganalisis pengaruh faktor iklim terhadap penyebaran hama wereng batang coklat (Nilaparvata lugens Stal) pada tanaman padi di Kabupaten Cianjur menggunakan Climex 4.0. Model Climex 4.0 dapat digunakan untuk menganalisis penyebaran hama wereng batang coklat terhadap pengaruh faktor iklim. Pertumbuhan hama wereng batang coklat dapat dipresentasikan menggunakan Indeks Ekoklimatik (EI). EI dihasilkan dari compare location dan compare years untuk membandingkan tingkat kesesuaian hama wereng batang coklat. Tahun 2008-2017 terjadi periode yang sesuai untuk perkembangan hama wereng batang coklat. Pertumbuhan dan perkembangan hama wereng batang coklat (Nilaparvata lugens Stal) sangat sesuai dengan karakteristik iklim di wilayah Kabupaten Cianjur. Adapun nilai indeks ekoklimatik yang diperoleh di Kabupaten Cianjur sebesar 67, hal tersebut menunujukkan bahwa potensi hama wereng batang coklat dapat hidup dan berkembang dengan baik. Tahun 2011 merupakan nilai indeks ekoklimatik tertinggi sebesar 79 dan tahun 2013 merupakan nilai indeks ekoklimatik paling rendah di Cianjur yaitu sebesar 56. Faktor iklim yang sangat mempengaruhi serangan hama wereng batang coklat adalah curah hujan., This study aims to analyze the effect of climatic factors on the spread of the brown planthopper (Nilaparvata lugens Stal) on rice plants in Cianjur Regency using Climex 4.0. The Climex 4.0 model can be used to analyze the spread of the brown plant hopper against the influence of climatic factors. The growth of the brown planthopper can be represented using the Ecoclimatic Index (EI). EI is generated from compare location and compare years to compare the suitability of brown planthopper pests. The year 2008-2017 was an appropriate period for the development of the brown planthopper. The growth and development of the brown plant hopper (Nilaparvata lugens Stal) is in accordance with the climatic characteristics of the Cianjur Regency. The ecoclimatic index value obtained in Cianjur Regency is 67, it shows that the potential for brown planthopper pests can live and develop well. The year 2011 was the highest ecoclimatic index value of 79 and 2013 was the lowest ecoclimatic index value in Cianjur, which was 56. Climatic factors that greatly affect the attack of brown planthopper pests are rainfall.
Keyword: climex 4.0, hama wereng batang coklat, indeks ekoklimatik, potensi luas serangan

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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