Judul: Minyak Nilam sebagai Biofungisida untuk Mengendalikan Penyakit Antraknosa (Colletotrichum capsici (Syd.) Butler & Bisby) pada Buah Cabai
Abstrak: Anthracnose is one of the caused of low chili productivity in Indonesian its caused by C. capsici. Much farmer using a fungicide as a controlling. Using of fungicide with uncontrolled could have a negative impact on the environment. The aim of this study is to test the potential of patchouli oil as fungicide in suppresses the growth of C. capsici causes anthracnose disease on chili. In this study conducted the isolation and purification of C. capsici, test in vitro by isolates C. capsici grown on PDA mixed with patchouli oil (A and B) with a concentration of 10%, 5%, 2.5%, 1.25%, and 0.625% done separately, isolates of C. capsici grown on PDA medium as a negative control (Kn) and PDA media mixed with fungicides mankozeb as a positive control (Kp). Initial diameter isolates C. capsici is 7 mm. The measured variable is growth of colonies of C. capsici and percentage inhibition of colony growth of C. capsici. The results showed that patchouli oil A effectively significant suppresed C. capsici growth compare to patchouli oil B at 10 HSP in 91.15% at each concentration except were concentration of 0.625% with inhibitory ability of 85.92%. The patchouli oil A with a concentration of 2.5% used in the in vivo test. The in vivo test was applicated of patchouli oil in chilies with preventive, curative, and resistance induction. Variables which measured are the incubation period and intensity disease. The results showed an incubation period on curative test was 8 HSI, preventive and induction of resistant test was 5 HSI, while the intensity of the attacks C. capsici at 10 HSI at test curative 4.80%, preventive 23.20%, and resistance induction 29.60%, compared with Kp 29.60% and Kn 68.80%.
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Judul: Keefektifan Kitosan dan Aktinomiset dalam Pencegahan Busuk Antraknosa (Colletotrichum capsici (Syd.) Butler & Bisby) Buah Cabai Merah
Abstrak: Anthracnose due to Colletotrichum capsici is one disease that can decrease the quantity and quality of chillies production in Indonesia. Chitosan and actinomycetes are now widely used in controlling various plant diseases. The objectives of this research have been designed to evaluate the effectiveness of chitosan and two isolates of actinomycetes in preventing anthracnose on red chilli. In vitro test was conducted through baiting poisonous methods, while in vivo test has been done by solution coating of chitosan, isolate actinomycetes of APS5 and APS12, and their combination on the red chilli. The experiment had been done in a completely randomized design with 4 replications. The variables observed were the diameter growth of fungal colonies C. capsici, relative prevention growth, disease severity, and the rigidity of red chilli. The results of in vitro experiment showed that the concentration suspension of APS12, APS5, and APS512 (10%) were effective in suppressing the growth of C. capsici with 57%-72% of relative prevention growth. In vivo experiment showed that the coating of 1% CT, CTAPS5, CTAPS12 could reduce disease severity of C. capsici and lengthen the shelf life of red chilli until 10 days.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular