Article Per Year (5 Year)
p-Index From 2020 - 2025
0.817
P-Index
This Author published in this journals
All Journal Jurnal Fitopatologi Indonesia Jurnal Penelitian Kelapa Sawit
Hari Priwiratama
Pusat Penelitian Kelapa Sawit
Agriculture, Biological Sciences & Forestry Medicine & Pharmacology

Published : 5 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 5 Documents
Search

 1 
Laju Fotosintesis pada Tanaman Kelapa Sawit Terinfeksi Karat daun Cephaleuros virescen Agus Susanto; Agus Eko Prasetyo; Hari Priwiratama; Muhdan Syarovi
Jurnal Fitopatologi Indonesia Vol 16 No 1 (2020)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.235 KB) | DOI: 10.14692/jfi.16.1.21-29

Abstract

Photosynthesis Rate of Oil Palm Infected by Red Rust Cephaleuros virescens The incidence of oil palm red rust disease caused by Cephaleuros virescens tends to increase in Indonesia. However, the loses due to this disease has never been measured quantitatively. This study was conducted to measure the rate of photosynthesis on 5-year-old palms with 3 infection categories, i.e. mild, medium, and heavy infection. Field observation of oil palm in Kalianta showed that the infection of red rust disease occurred starting from lower to the upper fronds. Higher infection was prevalently on the adaxial than abaxial leaf. The red rust infection on frond number 17 or younger severely affects the photoshynthesis rate of the oil palm. On the palm with heavy infection category, the photosynthesis rate on frond number 9 was decreased up to 42.48%, i.e. from 15.51 µmol to 8.92 µmol, compared to that with mild infection.
EFEKTIVITAS FLUBENDIAMIDA DALAM PENGENDALIAN ULAT API Setothosea asigna Van Eecke, ULAT KANTUNG Metisa plana Walker, DAN PENGGEREK TANDAN Tirathaba rufivena Walker SERTA PENGARUHNYA TERHADAP AKTIVITAS KUMBANG PENYERBUK Elaeidobius kamerunicus Faust.EFEKTI Hari Priwiratama; Tjut Ahmad Perdana Rozziansha; Agus Eko Prasetyo
Jurnal Penelitian Kelapa Sawit Vol 26 No 3 (2018): Jurnal Penelitian Kelapa Sawit
Publisher : Pusat Penelitian Kelapa Sawit

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1908.433 KB) | DOI: 10.22302/iopri.jur.jpks.v26i3.63

Abstract

Flubendiamide is a new insecticide that highly selective against Lepidopteran insect pests. A research was conducted to determine the effects of flubendiamide application on the mortality of nettle caterpillar S. asigna, bagworm M. plana, and bunch moth T. rufivena on mature oil palm. In addition, we also investigated the effects of flubendiamide application on the activity of pollinating weevil E. kamerunicus. Flubendiamide was sprayed directly on the affected oil palm canopy or fruit bunches at the application rate of 0, 50, 100, 150, and 200 mL/ha. On the other hand, flubendiamide was sprayed directly on the anthesis male inflorescences at the dose of 150 mL/ha to study for its impacts against the activity of E. kamerunicus. The results showed that the mortality of each pest increased in line with the dose of application. Flubendiamide was effective against the leaf-eating caterpillar at the application rate of 150-200 mL/ha whilst the application of 200 mL/ha flubendiamide was required for controlling the bunch moth. Moreover, the application of flubendiamide had no adverse effects on the activity and the development of E. kamerunicus on male inflorescences.
Efektivitas Campuran Indaziflam dan Glifosat untuk Pengendalian Gulma pada Areal Tanaman Kelapa Sawit Menghasilkan Wiharti Oktaria Purba; Hari Priwiratama; Agus Susanto
Jurnal Penelitian Kelapa Sawit Vol 28 No 2 (2020): Jurnal Penelitian Kelapa Sawit
Publisher : Pusat Penelitian Kelapa Sawit

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iopri.jur.jpks.v28i2.95

Abstract

Tank mixing of pre and post emergence herbicides with proper timing application is one potential way to reduce the rotation of herbicide application per year. An experiment was conducted in the field of 10 years old mature oil palm using the mixture of indaziflam 50 - 150 g a.i./ha and glyphosate 135 g a.i./ha. The standard herbicide used in the estate (mixture of methyl-metsulfuron 10 g a.i/ha and glyphosate 135 g a.i./ha) was used as a comparison. The experiment was designed by randomized block of 6 treatments and 4 repetitions. Herbicides were applied in rotation based on the designed timetable following field condition and certain policy in the estate. Indaziflam had shown its ability to suppress the growth of weed up to 9 months after application, just by the lowest dosage of 50 g b.a./ha. Indaziflam is safe to be used in the plantation as it showed no toxic nor negative effects to the oil palm. The mixture of indaziflam and standard herbicide have also reduced the rotation of herbicide application to twice a year.
Dampak aplikasi kumatetralil dan Sarcocystis singaporensis terhadap serangan hama tikus di perkebunan kelapa sawit Mahardika Gama Pradana; Hari Priwiratama; Agus Eko Prasetyo; Agus Susanto
Jurnal Penelitian Kelapa Sawit Vol 29 No 3 (2021): Jurnal Penelitian Kelapa Sawit
Publisher : Pusat Penelitian Kelapa Sawit

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iopri.jur.jpks.v29i3.155

Abstract

The management of rat attack in oil palm plantation is commonly achieved through rodenticide application as well as in combination with the utilization of natural enemies. In this study, field efficacy of two rodenticide active ingredients i.e. coumatetralyl and Sarcocystis singaporensis against Rattus tiomanicus was conducted in mature oil palm blocks. The experiment was carried out in a randomized complete block design consisting of 3 treatments and 6 blocks/replicates. The application of coumatetralyl was conducted at the dose of 1 block bait per palm, while S. singaporensis treatment was conducted at the dose of 2 pellets per palm. The rodenticide application was carried out four times at five days interval. The result showed that incidence of rat attack decreased in all experimental blocks. The incidence of rat attack on coumatetralyl treatment was significantly lower than the control block at 5 and 10 days after application (daa), where as S. singaporensis treatment only showed a significant reduction at 5 daa. The average rate of reduction in rat attack during application of coumatetralyl, S. singaporensis, and control treatments was 53.80%; 38.58%; and 21.86%, respectively. The intensity of rat attack on male flowers before application was ranged between 31.87% to 40.64%, while the intensity on fruit bunches was ranged from 4.85% - 7.52%. The decrease in the incidence and intensity of rat attack is in line with the decrease in rodenticide consumption. In coumatetralyl treatment, consumed bait decreased from 75.02% to 57.03%, while in S. singaporensis treatment it decreased from 61.38% to 47.20%. In general, the efficacy value of coumatetralyl was higher than that of S. singaporensis.
Dampak Aplikasi Konsorsium Mikoriza Terhadap Pertumbuhan Vegetatif Tanaman dan Perkembangan Penyakit Ganoderma di Pembibitan Kelapa Sawit Hari Priwiratama; Mahardika Gama Pradana; Agus Susanto; Tjut Ahmad Perdana Rozziansha; Fatimah Nur Istiqomah
Jurnal Penelitian Kelapa Sawit Vol 30 No 3 (2022): Jurnal Penelitian Kelapa Sawit
Publisher : Pusat Penelitian Kelapa Sawit

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iopri.jur.jpks.v30i3.190

Abstract

Penelitian untuk mengetahui dampak aplikasi konsorsium mikoriza terhadap pertumbuhan vegetatif tanaman dan tingkat kejadian penyakit Ganoderma dilakukan pada fase pembibitan kelapa sawit. Percobaan disusun dalam rancangan acak lengkap faktorial dengan dua faktor (dosis mikoriza dan waktu inokulasi Ganoderma) dan tiga taraf perlakuan pada masing-masing faktor utama yaitu dosis mikoriza sebanyak 0 g, 30 g di pre-nursery (PN) ditambah 40 g di main nursery (MN), atau 40 g di PN ditambah 50 g di MN, dengan waktu inokulasi Ganoderma pada 3 atau 6 bulan setelah tanam dan perlakuan tanpa inokulasi sebagai pembanding. Hasil penelitian menunjukkan bahwa isolat mikoriza yang digunakan dapat bersimbiosis dengan perakaran bibit kelapa sawit dengan tingkat kolonisasi antara 39,13% dan 45,74%. Aplikasi mikoriza tidak memberikan pengaruh positif terhadap pertumbuhan meninggi dan jumlah daun bibit kelapa sawit, namun berdampak signifikan terhadap perkembangan diameter bonggol yang lebih lebar. Kejadian dan intensitas penyakit Ganoderma pada tanaman dengan aplikasi mikoriza secara signifikan lebih rendah dibandingkan dengan perlakuan tanpa mikoriza. Aplikasi mikoriza mampu menekan perkembangan penyakit hingga lebih dari 50% pada seluruh dosis yang digunakan.
Co-Authors Agus Eko Prasetyo Agus Susanto Agus Susanto Fatimah Nur Istiqomah Mahardika Gama Pradana Mahardika Gama Pradana Muhdan Syarovi Tjut Ahmad Perdana Rozziansha Wiharti Oktaria Purba