Judul: Aplikasi Tanaman Pinggir dan Ekstrak Daun Pagoda untuk Pengendalian Bean common mosaic virus pada Kacang Panjang di Lapangan
Abstrak: Bean common mosaic virus is the one of an important virus and is one of causal of yellow mosaic diseases on yard long bean. The research was done to test the effectiveness of barrier crop and pagoda leaf extract which applied either separately or together to suppressed BCMV infection in the field. Maize as barrier crop was grown at 4 weeks prior yard long bean. Pagoda leaf extract was applied as leaf spraying at one day prior BCMV transmission. BCMV was transmitted by releasing viruliferous Aphis craccivora at four site points in the field. The incubation period, disease incidence, severity and BCMV accumulation were observed. The symptom were vary from mild up to severe mosaic, yellow mosaic, yellowing, leaf vein netting, leaf and fruit malformation. The incubation period of treatment plants were relatively 1-2 days longer than untreated control. The disease incidence, severity and BCMV accumulation of the treatment plants were lower, especially on combination treatment was significantly lower than control plants. Among tested treatments, the application of barrier crop in combine with pagoda leaf extract was the best treatment in suppressing BCMV in the field.
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Judul: Efikasi Beberapa Ekstrak Tanaman untuk Mengendalikan Bean common mosaic virus pada Kacang Panjang di Lapangan
Abstrak: Yard long bean is an important vegetable in Indonesia. One of its production constraint is the infection of Bean common mosaic virus (BCMV). In the field, BCMV infection is difficult to be controlled. One of effort to control the virus is by utilizing antivirus substances from plant origin. The conducted research aim was to test the effectiveness of plant extracts considerably containing antivirus substances to control BCMV on yard long bean in the field trial. Fourteen plants species were applied as crude and protein extracts which were sprayed on the leaves an hour before mechanical inoculation of BCMV. The experiment was arranged by using randomized block design. Each treatment consist of 3 blocks as replicate. Incubation period, disease incidence, symptom, disease severity and titer of BCMV were measured. The result showed that either crude extract or protein extract prolonged the incubation period and decreased the disease severity. Relative inhibition level of severity and BCMV titer of crude extract treatments ranged from 48,4% to 89.8% and from 59.8% to 99.1%, whereas protein extract treatment ranged from 43.2% to 74.4% and from -55.1% to 42.7%, respectively. Crude extract treatment showed more effective to control BCMV infection than protein extract treatment. Among tested plant extracts, Bougainvillea spectabilis and Psidium guajava crude extracts showed highest relative inhibition level of severity and BCMV titer in controlling BCMV in the field.
Keyword: yard long bean, plant extract, BCMV, antivirus

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology