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All Journal Jurnal Fitopatologi Indonesia Buletin Palma
Agus Eko Prasetyo
Pusat Penelitian Kelapa Sawit, Medan
Agriculture, Biological Sciences & Forestry Medicine & Pharmacology

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Respons Curvularia lunata Penyebab Penyakit Bercak Daun Kelapa Sawit terhadap Berbagai Fungisida Agus Susanto; Agus Eko Prasetyo
Jurnal Fitopatologi Indonesia Vol 9 No 6 (2013)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (393.166 KB) | DOI: 10.14692/jfi.9.6.165

Abstract

Leaf spot disease of oil palm caused by Curvularia sp. is the major disease in nursery. Implementation of best nursery practices is the key to prevent it. Generally, fungicides are used only if epidemic of leaf spot diseases occur in the field. The objectives of this research were to determine causal agent of leaf spot disease of oil palm and the potential alternative weed host around the nursery, to select suitable fungicides, and to study the effect of fungicides rotation to disease incidence. The results showed that the causal agent of leaf spot disease of oil palm was Curvularia lunata. The fungus was also found on grasses, Cyperus rotundus and Imperata cylindrica. Difeconazol, copper oxide, and propineb suppressed leaf spot disease in nursery. Application of fungicide by rotation between difeconazol and copper oxide with frequency every 10 days suppressed the development of leaf spot disease of oil palm in the nursery.
Pengendalian Penyakit Busuk Pangkal Batang Kelapa Sawit secara Kultur Teknis Hari Priwiratama; Agus Eko Prasetyo; Agus Susanto
Jurnal Fitopatologi Indonesia Vol 10 No 1 (2014)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (308.722 KB) | DOI: 10.14692/jfi.10.1.1

Abstract

Effort to manage basal stem rot disease (BSR) caused by Ganoderma boninense could be conducted through several cultural practice approaches. Four series of field experiments was conducted to observe the effectiveness of cultural practice methods for controlling the epidemic of basal stem rot due to G. boninense. Sanitation trial consisted of three treatments i.e root sanitation with big hole planting system, big hole without root sanitation, and standard replanting system as comparison. Hole in hole and standard planting system were compared in the hole in hole trial. Digging and mounding trial was conducted in four treatments, i.e. digging and mounding with teer and Trichoderma, digging and mounding with Trichoderma, mounding with Trichoderma, and infected palm without any treatment as comparison. Meanwhile, a 4 m × 4 m trench was used in the isolation trench trial. Annual observation was conducted to determine the disease incidence of BSR in each trial. Results showed that all methods could prevent palms from G. boninense infection in the early stage of oil palm development. Proper root sanitation delayed G. boninense infection until 2 years after treatment (YAT), hole in hole planting system was able to suppress disease incidence up to 7 YAT, digging and mounding was useful to prolong the life of the infected palms up to 3 YAT, meanwhile the use of isolation trench was demonstrated to prevent G. boninense infection to neighboring palms up to 2 YAT.
Kajian Penunasan Berat Pelepah terhadap Kuantitas dan Kualitas Bunga Jantan Kelapa Sawit serta Ketertarikan Elaeidobius kamerunicus FAUST Agus Eko Prasetyo; Nanang Supena; Agus Susanto
Buletin Palma Vol 22, No 1 (2021): Juni 2021
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/bp.v22n1.2021.52-61

Abstract

Praktek penunasan berat pelepah kelapa sawit bertujuan untuk menghasilkan bunga jantan sehingga kebutuhan polen dan kumbang Elaeidobius kamerunicus dapat terpenuhi sehingga penyerbukan alami dapat menjamin pembentukan fruit set tandan yang normal. Penunasan berat dilakukan mulai tanaman umur 2 tahun dengan perlakuan penunasan hingga menyisakan hanya satu lingkar pelepah muda (8 pelepah/tanaman) dan sisa 2 lingkar pelepah muda (16 pelepah/tanaman) setiap bulan. Sebagai kontrol digunakan tanaman dengan penunasan normal yakni menyisakan 48-56 pelepah/tanaman. Hasil pengamatan selama 48 bulan menunjukkan bahwa terjadi peningkatan jumlah bunga jantan pada kedua perlakuan penunasan berat, jumlah produksi bunga jantan pada penunasan berat dengan menyisakan 8 pelepah/tanaman. Namun ukuran bunga jantan yang terbentuk lebih kecil (menurun sebesar 30,15-51,11%) bila dibandingkan dengan kontrol sehingga jumlah polen yang dihasilkan juga lebih sedikit dengan penurunan sebanyak 28,59-38,28%. Bahkan viabilitas polen kelapa sawit pada perlakuan penunasan berat juga berkurang 12,58-15,51%. Penurunan kualitas bunga jantan ini diikuti dengan penurunan jumlah kunjungan kumbang E. kamerunicus sebesar 22,63-31,01% dan penurunan jumlah kemunculan kumbang baru dari tandan bunga jantan lewat mekar sebanyak 40,89-49,40%. Kualitas bunga jantan pada kedua perlakuan penunasan berat tidak berbeda. Aplikasi penunasan berat pelepah kelapa sawit berdampak pada peningkatan kuantitas bunga jantan tetapi memiliki kualitas yang menurun bahkan kurang menarik bagi E. kamerunicus untuk berkembang biak.
Co-Authors Agus Susanto Agus Susanto Hari Priwiratama Nanang Supena