Judul: Identifikasi dan Efektivitas Agen Hayati terhadap Patogen Penyebab Penyakit Jamur Akar Putih (Rigidoporus sp.) secara in Vitro
Abstrak: Penyakit pada tanaman memberikan pengaruh terhadap proses pertumbuhan tanaman tersebut. Salah satu patogen penyebab penyakit jamur akar putih Rigidoporus sp. dapat menular melalui kontak akar. Penelitian ini bertujuan mengetahui jenis agen hayati dan efektivitasnya dalam menghambat Rigidoporus sp. secara in vitro. Identifikasi dilakukan secara makroskopis dan mikroskopis. Pengujian daya hambat dilakukan pada media Potato Dextrose Agar (PDA) yang kemudian dilanjutkan dengan uji sidik ragam dengan Rancangan Acak Lengkap Satu Faktor. Hasil penelitian menunjukkan bahwa jenis agen hayati yang teridentifikasi yaitu Trichoderma sp. dengan umur peremajaan 8 hari (T8) paling efektif dalam menghambat pertumbuhan Rigidoporus sp. dan memiliki persentase paling tinggi yaitu sebesar 71%. Kata kunci: penghambatan, peremajaan, Rigidoporus sp, Trichoderma sp., Diseases affect the process of plant growth. One of the pathogens that causes white root fungal disease Rigidoporus sp. can be transmitted through root contact. This study aims to determine the types of biological agents and their effectiveness in inhibiting Rigidoporus sp. in vitro. Identification is carried out macroscopically and microscopically. Inhibitory power testing was carried out on Potato Dextrose Agar (PDA) media which was then followed by a fingerprint test with a One-Factor Complete Random Design. The results showed that Trichoderma sp. with a rejuvenation age of 8 days (T8) was the most effective in inhibiting the growth of Rigidoporus sp. and had the highest percentage at 71%. Keywords: inhibition, rejuvenation, Rigidoporus sp, Trichoderma sp.
Keyword: inhibition, rejuvenation, Rigidoporus sp., Trichoderma sp.

Judul: Potensi Trichoderma harzianum dan Mikoriza untuk Pengendalian Penyakit Jamur Akar Putih (Rigidoporus lignosus (Kloztch) Imazeki) pada Karet.
Abstrak: Indonesia is the largest producer of rubber after Thailand. The development of the rubber industry is still on going. However, the presence of rubber diseases become a problem in the rubber industry development. White root fungus disease caused by the fungus Rigidoporus lignosus is a major disease in rubber plantations. The experiment aims to determine the potential of the fungus Trichoderma harzianum and mycorrhizae fungi for controlling white root disease on rubber seedlings in the greenhouse. The experiment has been done in complete randomizeddesign, 8 treatments and 4 replications. The treatments were, applications of T. harzianum, mycorrhizae, and their combinations, with and without R. lignosus. The result have shown that T. harzianum, mycorrhizae, and their combinations have supressed JAP diseases incidence and severity. At the time of seedlings, the treatment of T. harzianum singly has found as the most effective and efficient in supressing diseases severity and in increasing plant vegetative growth.
Keyword: mycorrhiza, Rigidoporus lignosus, rubber, Trichoderma harzianum

Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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