Judul: Pengaruh Cendawan Endofit terhadap Biologi dan Pertumbuhan Populasi Polyphagotarsonemus latus Banks (Acari: Tarsonemidae) pada Tanaman Cabai
Abstrak: Broad mite Polyphagotarsonemus latus is one of the most important pests of pepper. High population of P. latus on pepper may cause death on plants. One of the alternative environmental-friendly control methods is the use of endophytic fungi. This study aimed to know effect of the endophytic fungi on biology and population growth of broad mite on pepper. The pepper seeds were soaked in miselium suspension for 12 hours and then planted. Three weeks after seeds planting, peppers were sprayed with miselium suspension. Broad mite collected from the field were reared on pepper in the laboratory. The same age-five female adults were infested on each pepper seedling a week after last inoculation of endophytic fungi. The population growth of broad mite were observed each week for 10 weeks. In the laboratory, 50 broad mite eggs were reared on pepper leaves and observed every 6 hours until adult emergence. P. latus then paired and observed everyday until all adults dead. Life cycle, fecundity, sex ratio and adult longevity were observed. The result showed that treatment of endhophytic fungi could increase pepper seeds viability. Several kinds of endophytic fungi also suppressed population growth, elongated praoviposition period, reduced mite fecundity and increase the number of male.
Keyword: population growth, Polyphagotarsonemus latus, endophytic fungi, pepper

Judul: Pengaruh Cendawan Endofit terhadap Biologi dan Statistik Demografi Wereng Batang Cokelat
Abstrak: Endophytic fungi is an endosymbiont that lives within host plant tissues without causing any visible symptom of disease. This type of fungus are important as mediators in plant-herbivore interactions. Endophytic fungi are known to enhance resistance of host plant against insect herbivores mainly by productions of various alkaloid-based defensive compounds in the plant tissue or through alterations of plant nutritional quality. This study was conducted as an attempt to gain information on the effect of Nigrospora sp4 on the biology and life history of of brown plant hopper (BPH). Nigrospora sp4 culture (in powder form), were provided by Plant Clinic of Bogor Agriculture University, and was used to inoculate the fungi to the rice seeds. The effect of endophyte infected and endophyte-free plants were measured on the survival and development of Nilaparvata lugens Stál, a major pest in rice. Endophyte infected plants showed resistance to N. lugens in the form of significant increase in eggs and early nymphs mortality. Another effect of endophytic fungi which was also observed on this study were nymphal development, life cycle, preovipositional period as well as age at first reproduction. The overall result showed that Nigrospora sp4 has an affect toward population growth of N. lugens in laboratory scale and artificial inoculation of endophytes could be a useful method to protect rice plants from N. Lugens. This result could be used to develop alternative ecologically safe control strategies.
Keyword: 

Judul: Karakteristik lompatan hidrolik terhadap pelimpah terjunan pada saluran segi empat
Abstrak: Aliran dengan kecepatan tinggi dalam kondisi superkritis yang melintasi bangunan pelimpah, sebelum bergerak lebih jauh ke arah hilir saluran dimana bilangan Froude (F) lebih besar dari satu harus diubah menjadi aliran subkritis dimana bilangan Froudenya lebih kecil dari satu. Aliran yang meninggalkan kaki pelimpah merupakan aliran yang memiliki kandungan energi yang amat berarti sehingga dapat menimbulkan pengikisan yang besar. Pengubahan bilangan Froude dari kondisi superkritis ke subkritis dimaksudkan agar terjadi perubahan kandungan energi, sehingga aliran menjadi non erosive. Agar daya erosive aliran dapat berkurang, maka biasanya pada bagian hilir dari bangunan pelimpah dibuatkan suatu bangunan peredam energi. Erosi yang terjadi di hilir bangunan pelimpah dapat disebabkan dari keberadaan bangunan pelimpah itu sendiri, maupun bangunan peredam energi yang kurang tepat. Hal ini terutama menyangkut beberapa kejadian lompatan hidrolik yang timbul pada bangunan peredam energi tersebut.. Suatu metode yang efektif untuk menjamin bahwa lompatan hidrolik selalu terjadi pada daerah yang dilindungi, adalah dengan menggunakan bangunan peredam energi yang terdiri dari beberapa tipe dengan..dst
Keyword: