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All Journal AGROEKOTEKNOLOGI
Suzanna F Sitepu
Universitas Sumatera Utara
Agriculture, Biological Sciences & Forestry

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Parasitisasi dan Kapasitas Reproduksi Cotesia flavipes Cam. (Hymenoptera: Braconidae) pada Beberapa Jumlah dan Ukuran Larva Chilo sacchariphagus Boj. (Penggerek Tebu Bergaris) (Lepidoptera: Crambidae) di Laboratorium Poppy Margaretha Siregar; Suzanna F Sitepu; Hasanudin Hasanuddin
Jurnal Agroekoteknologi Vol 3, No 2 (2015)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (200.895 KB) | DOI: 10.32734/jaet.v3i2.10312

Abstract

The objectives of this research was to study the parasitization and reproduction capacity ofCotesia flavipes Cam. (Hymenoptera: Braconidae) on different number and size of larvaeChilo sacchariphagus Boj. larvae (Lepidoptera: Crambidae). The research was conducted at theLaboratory of Sugarcane Research and Development Sei Semayang, Binjai, North Sumatera fromMay until June 2014. This method used Randomized Complete Design with two factors. The firstfactor was numbers of larvae Chilo sacchariphagus (1, 2 and 3) and the second factor was sizeof C. sacchariphagus (small, medium and large) with three replications.The results showed thatsize from larvae C. sacchariphagus significantly effected the percentage of parasititation.The highest percentage of parasititation (77.78%) on big larvae (2-2.5cm) and the lowest (37.33%)on the medium larvae (1.5-2cm). The day of cocoons formed were between 16-18 days. Sex ratio ofmale (41.13%) and female (58.86%) with ratio was 1 : 1.43.Keywords : parasitization, Cotesia flavipes, Chilo sacchariphagus, host size.
Hubungan Persentase Serangan dengan Estimasi Kehilangan Hasil Akibat Serangan Hama Penggerek Buah Kopi Hypothenemus Hampei Ferr.(Coleoptera: Scolytidae) di Kabupaten Simalungun Rahutdin P Purba; Darma Bakti; Suzanna F Sitepu
Jurnal Agroekoteknologi Vol 3, No 2 (2015)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (248.67 KB) | DOI: 10.32734/jaet.v3i2.10368

Abstract

The objectives of the research was todetermine the relationship ofthe percentage of attackandestimateyield losses due toattack by coffee berryborer, HypothenemushampeiFerr. (Coleoptera: Scolytidae) inSimalungun district.This research used asurvey methodwith linear regression analysis between percentage of attack withpercentageloss of yield, regressionbetween the percentage of attack withpopulation densityand regressionbetweenpopulationdensity with percentageyield loss.The results showedthat thepopulationdensity ofpests onred fruithad asignificant relationship to thepercentageof yield lossin the red fruit,butthe percentage of attacksdid not havea significant relationship topopulation densityandthe percentage ofyield loss. The highestattack intensity(46.78%) wasin the DolokHuluanand the lowest(5.42%) wasin Bangun Saribu. The highest percentage of yield loss(17.25%) wasin SimpangHinalangand the lowest(8.45%) wasin BosiSinombah. The highestpopulationdensity(17.80) found inredfruitsand the lowest(6.32) was alsofound inred fruits.Keywords : coffee, percentage ofattack, Hypothenemus hampei Ferr.
Uji Evektifitas Eksudat Akar Bangun – Bangun (Coleus amboimicus) untuk Menghambat Pertumbuhan Jamur Akar Putih (Rigidoporus micropus) di Laboratorium irfansyah harahap; Lisnawita Lisnawita; Suzanna F Sitepu
Jurnal Agroekoteknologi Vol 7, No 2,April (2019)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (645.379 KB) | DOI: 10.32734/jaet.v7i2,April.21962

Abstract

The white root rot disease caused by Rigidoporus micropus is the main disiase found in rubber trees that can cause decay on the roots. The research begins from April until August, 2016. It was conducted in Laboratorium Proteksi Balai Pembibitan Karet Sungai Putih Laboratory of Protection of Rubber Breeding Center, Deli Serdang District, North Sumatera Province. The objective of the research was to find out the potentials of root exudates to inhibit the growth of R. microporus. This research used non-factorial RAL (Completely Randomized Design) which observed the growth area of colony of R. microporus, hypha abnormality, inhibition percentage, protein analysis as well as hypha microscopy and macroscopy. In this study it was found that protein compounds were not inhibiting factors for growth of white root fungi but phenol compounds. The largest growth of R. microporus colony was found in the control treatment (64 cm2). Meanwhile, the lowest growth of R. microporus colony was found in the treatment of 10% of bangun-bangun root exudates. This research proves that bangun-bangun root exudates were able to inhibit the growth of white root rot disease of rubber. Hypha abnormality was found in every treatment which has been added by bangun-bangun root exudates. However, abnormalities of white root fungal hyphae were clearly seen in the treatment 10% of bangun-bangun of root exudates.
Co-Authors Darma Bakti Hasanudin Hasanuddin irfansyah harahap Lisnawita Lisnawita Poppy Margaretha Siregar Rahutdin P Purba