Pengaruh Warna Perangkap Feromon terhadap Hasil Tangkapan Imago Oryctes Rhinoceros di Perkebunan Kelapa Sawit

The effectiveness of a synthetic-pheromone trap with active ingredient of ethyl-4-methyloctanoate in catching adults of Oryctes rhinoceros was believed to be influenced by the trap color. A RCBD trial with single factor and three block replicates was conducted during September to October 2008 at Oil-Palm-Trial Station at PTPN III, Labuhan Batu District, North-Sumatera Province. The single factor was trap color i.e. orange, green, white, blue, red, yellow, and pink. Results showed that total numbers and sex ratios of collected O. rhinoceros adults were not significantly influenced by the trap color. The total numbers of collected O. rhinoceros adult during 30 days on color of orange, green, white, blue, red, yellow, and pink were 136, 177, 126, 155, 129, 114, and 113 individuals with sex ratios ♂/♀ 0.47, 0.52, 0.62, 0.50, 0.60, 0.49, and 0.54, respectively. The synthetic pheromone significantly attracted more O. rhinoceros female (65%) rather than the male one (35%). Keefektifan perangkap feromon sintetik berbahan aktif ethyl-4-methyloctanoate dalam menangkap imago Oryctes rhinoceros diyakini dipengaruhi oleh warna perangkap tersebut. Percobaan RCBD faktor tunggal dengan tiga blok ulangan dilakukan pada bulan September sampai dengan Oktober 2008 di kebun penelitian kelapa sawit PTPN III, Kabupaten Labuhan Batu, Provinsi Sumatera Utara. Faktor tunggal tersebut yakni warna perangkap meliputi oranye, hijau, putih, biru, merah, kuning, dan pink. Hasil penelitian menunjukkan bahwa warna perangkap tidak berpengaruh signifikan terhadap hasil tangkapan dan sex ratio imago O. rhinoceros. Total imago O. rhinoceros yang tertangkap selama 30 hari pada warna oranye, hijau, putih, biru, merah, kuning dan pink sebanyak 136, 177, 126, 155, 129, 114 dan 113 dengan sex ratio ♂/♀ 0,47; 0,52; 0,62; 0,50; 0,60; 0,49 dan 0,54. Feromon sintetik secara signifikan lebih banyak menarik imago betina (65%) daripada yang jantan (35%)

Influence of PGPR, Bio-Phosphate Microorganism and Phosphate on Growth of Oil Palm Seedlings Under Drought Stress Conditions

Drought is a major abiotic stress that threatens the production of agricultural oil palms. Drought interferes with plant uptake of phosphorus. The goal of this study was to investigate how plant growth-promoting rhizobacteria (PGPR), bio-phosphate microorganisms, and phosphate affected oil palm growth under drought stress. The study was conducted at the Tri Dharma Research Station INSTIPER in Yogyakarta from January to May 2020, and it used a factorial and completely randomized design with two factors and three replicates per treatment. The first factor was a fertilization treatment that included P1 (PGPR), P2 (bio-phosphate microorganisms), P3 (phosphate). The second factor was a drinking interval of L1 (once per day) and L2 (once per seven days). At 120 days after planting, data were collected. The results showed that the PGPR, bio-phosphate microorganisms and phosphate had no significant effect on plant height, number of leaves, leaf area, chlorophyll content, dry weight of plants, volume of root, dry weight of root and shoot, stem diameter, number of stomata, and root-shoot ratio. Root volume, root dry weight, and root-shoot ratio were significantly affected by one-day and seven-day watering intervals. Phosphate fertilization with watering once every seven days considerably increased the width of the stomata openingsI Keywords: PGPR, Bio-Phosphate, Phosphate, Oil Palm, Drough