Abstract. Martanto EA, Tanati AE, Baan S, Tata HR, Murdjoko A. 2020. Effectiveness of biological control of Trichoderma harzianum on soybean leaf rust disease and the production in West Papua Lowland, Indonesia. Biodiversitas 21: 1935-1939. This study aims to evaluate the application of Trichoderma harzianum in leaf rust disease on soybean and its production. The study was conducted for three months starting from May to July 2017, at Residential Unit 11th Sidey Subdistrict, Manokwari District, West Papua Province, Indonesia. This study was designed using Factorial Complete Randomized Design consisting of two treatment factors and repeated three times. There was no treatment of pathogen inoculation in the field. The tested varieties had a different response to plant height. Burangrang, Grobogan, Dena-1, Anjasmoro, and Detam-1 varieties were categorized as moderate resistant varieties. The Trichoderma harzianum application should be applied in the whole crops of soybean to control environmentally the leaf rust disease. Seeds weight per plot for Dena-1 variety was higher compared to other varieties. The combination of Detam-1 varieties with Trichoderma treatment 2 times resulted in increased production.

<em>This research was carried out to identify species of fungi on soybean seeds at several processing �tahu-tempe� units in the District of Manokwari, in relation to the condition of storage and working places, such as : temperature, humidity, cleanness, period of storing and transportation of seeds. Results show that 8 funguses were found in attacking the seeds and was successfully identified, they are : Aspergillus flavus</em>, <em>A. niger, A. ochraceus, A. aculeatus, A. versicolor, Penicillium chrysogenum, Rhizopus oryzae, </em>and <em>Fusarium oxysporum</em>.<em>. Three� funguses, i.e. Aspergillus, Penicillium and Fusarium produce dangerous toxin (mycotoxin) to human in term of carcinogenic. It was known that soybean seeds was not save as food if were contaminated with fungus. Therefore, factors that caused growth of fungus on soybean seeds in the processing units in Manokwari should be prevented.</em>

Evaluation of scab disease resistance and production on sweet potato cultivars. This study was aimed to determine the resistance of local sweet potato cultivars to scab disease in West Papua and the cultivar production. Research was carried out for 6.5 months starting in April 2014. Evaluation of resistance of local sweet potato cultivars and production was designed using a randomized complete block design (RCBD) with three replications. The treatment consists of six local cultivars, namely Mouwebsi, Kuyage-2, Bonsasarai, Inanwatan-4, Wonembai, and Abomourow. There was no inoculation treatment on the field because Papua was endemic region to the scab disease. Data analysis was performed using analysis of variance (ANOVA), followed by DMRT test at level of 95%. Cultivars tested had different responses to the long tendrils of parameters and number of branches. The intensity of the disease in Bonsasarai cultivars was 31.7% (moderately resistant), while in Mouwebsi was 13.75%, Wonembai 8.33%, Kuyage-2 0.42%, Abomourow and Inanwatan-4, 0% categorized as resistant cultivars. The tuber weight of Abomourow (4.55 ton/ha) was higher than that of Mouwebsi (3.80 ton/ha), Wonembai (3.62 ton/ha), Bonsasarai (2.28 ton/ha), and Inanwatan-4 (1.12 ton/ha).Key words: production, resistance, scab, sweet potatoes ABSTRAKEvaluasi ketahanan terhadap penyakit kudis dan produksi beberapa kultivar ubijalar. Penelitian ini bertujuan untuk mengetahui ketahanan kultivar ubijalar lokal terhadap penyakit kudis di Papua Barat dan produksinya. Penelitian dilakukan selama 6,5 bulan dimulai sejak bulan April 2014. Evaluasi ketahanan beberapa kultivar ubijalar lokal dan produksinya dirancang dengan menggunakan rancangan acak kelompok yang perlakuannya diulang tiga kali. Perlakuan terdiri dari enam kultivar ubijalar lokal antara lain Mouwebsi, Kuyage-2, Bonsasarai, Inanwatan-4, Wonembai, dan Abomourow. Tidak ada perlakuan inokulasi di lapangan karena Papua merupakan daerah endemik penyakit kudis. Data dianalisis dengan menggunakan analisis varian, jika perlakuan berbeda nyata, dilanjutkan dengan uji DMRT pada tingkat kepercayaan 95%. Penelitian menunjukkan bahwa setiap kultivar yang dicoba mempunyai tanggapan yang berbeda pada parameter panjang sulur dan jumlah cabang. Panjang sulur dan jumlah cabang meningkat hingga pengamatan ketiga, pada pengamatan keempat ada yang menurun dan ada yang meningkat. Intensitas penyakit kultivar Bonsasarai sebesar 31,7% dikategorikan kultivar agak tahan, sementara intensitas penyakit kultivar Mouwebsi 13,75%, Wonembai 8,33%, Kuyage-2 0,42%, Inanwatan-4 dan Abomourow, 0% dikategorikan kultivar tahan. Bobot umbi kultivar Abomourow 4,55 ton/ha lebih tinggi daripada kultivar Mouwebsi 3,80 ton/ ha, Wonembai 3,62 ton/ha, Bonsasarai 2,28 ton/ha dan Inanwatan-4 1,12 ton/ha. Kata kunci: ketahanan, penyakit kudis, produksi, ubijalar PENDAHULUAN Ubijalar (Ipomoea batatas (L.) Lamb.) merupakan salah satu sumber pangan yang cukup potensial dalam mengatasi ketergantungan terhadap beras (Amir, 1988). Selain itu ubijalar ju...

Preference is a form of statement that expresses feelings of preferring one thing over another. This study aimed to determine the preferences of snails (Achatina fulica) to several types of plants in the area of Manokwari. The method used in this research were descriptive method and field observation. Observations in the field were carried out by inventory of snails from the six plants, namely gedi, banana, papaya, sweet potato, cassava, and mustard greens, while data collection in the yard was carried out with an olfactometer to see the interest of snails in several types of plants. The results showed that snails liked the gedi plant the most while the least preferred was cassava.

This study aimed to determine the potential of several isolates of Pseudomonas fluorescens group from the rhizosphere as biological agents in suppressing the growth of F. oxysporum f.sp. lycopersici in vitro. The method used in this research is an experimental method, by selecting several isolates of Pseudomonas bacteria group fluorescens that have the potential to control the pathogen F. oxysporum in vitro. The results showed that Pseudomonas isolates from fluorescens groups M1, M2, M3, and M4 had the potential to control the pathogen F. oxysporum f.sp. lycopersici in vitro by inhibiting the growth of pathogens. The average percentage of pathogen growth inhibition from the highest was isolate M2 (64.18%), isolate M3 (62.53%), isolate M1 (60.02%), and isolate M4 (60%).