Uji Efektivitas Jamur Antagonis Trichoderma SP. Dan Gliocladium SP. Untuk Mengendalikan Penyakit Lanas (Phytophthora Nicotianae) Pada Tanaman Tembakau Deli (Nicotiana Tabaccum L.)

The test of the effectiviveness of Trichoderma sp. and Gliocladium sp. antagonism fungi is aimed tocontrol lanas disease (Phytophthora nicotianae) in Deli tobacco plants (Nicotiana tabaccum L.). Theaim of the research was to know the effectiveness of Trichoderma sp. andGliocladium sp.antagonism fungi in controlling lanas disease in Deli tobacco plants. The research wasconducted at Tembakau Deli Research Center of PTPN II Sampali, Medan, from May untilSeptember, 2012. The research used non-factorial RAK (cluster random design) with ten treantmentsand three repetitions: control, P.nicotianae, 5 grams of Trichoderma sp., 10 grams of Trichoderma sp.,15 grams of Trichoderma sp., 20 grams of Trichoderma sp., 5 grams of Gliocladium sp.,10 grams of Gliocladium sp., 15 grams of Gliocladium sp., and 20 grams of Gliocladium sp. The resultof the research showed that the percentage of the highest attack was found in the treatment ofP.nicotianae (25.00%), but there was no symptom (0,00%) in the treatments of control,15 grams of Trichoderma sp., 20 grams of Trichoderma sp., 10 grams of Gliocladium sp.,15 grams of Gliocladium sp., and 20 grams of Gliocladium sp. The highest plant was found in thetreatment of 20 grams of Gliocladium sp. (50,92 centimeters) and the lowest plant was found in thetreatment of P.nicotianae (31,14 centimeters). The largest number of leaves was found in treatment of20 grams of Gliocladium sp. (20,18 leaves), and the smallest number of leaves was found in thetreatment of P.nicotianae (9,25 leaves). The result of the test of Trichoderma sp. and Gliocladium sp.antagonism fungi on P.nicotianae indicated that the growth of both fungi had rapidly developed so thatP.nicotianae tended to get away from antagonism at the media in the laboratory

Uji Antagonisme Beberapa Jamur Saprofit Dan Endofit Dari Tanaman Pisang Terhadap Fusarium Oxysporum F.sp. Cubens Di Laboratorium

This research aims to know antagonism of saprophytic and endophytic fungi against Fusarium oxysporum f. sp. cubens in Laboratory. The research was conducted at Plant Disease Laboratory, Agroecotechnology Program Study, Faculty of Agriculture, University of Sumatera Utara Medan from May to September 2014. It was done by using Completely Randomized Design (CRD) non factorial with seventeen treatments and three replications. The results showed all the saprophytic fungi (Gliocladium sp. and Acrostalagmus sp.) and endophytic fungi (Cephalosporium sp,. Pullularia sp., Aspergillus sp., Penicilium sp., Trichoderma sp. and Hormiscium sp.) potential as biological agents to control F. oxysporum f. sp. cubens in vitro. The best results obtained on Pullularia sp. with the ability to inhibit 60.577%. Interactions between saprophytic and endophytic fungi against F. oxysporum f. sp. cubens causing the hyphae of F. oxysporum f. sp. cubens malformations and lysis

Interaksi Tropik Jenis Serangga Di Atas Permukaan Tanah (Yellow Trap) Dan Pada Permukaan Tanah (Pitfall Trap) Pada Tanaman Terung Belanda (Solanum Betaceum Cav.) Di Lapangan

Tropic interaction of insect on soil surface and above soil surface on tamarillo (Solanum betaceum Cav.) in the field. The aim of the research were to knew interaction of insect on soil surface and above soil surface on tamarillo in the field and determined kinds of natural enemies and important pests. The research was conducted at Marubun Village Purba Subdistrict Simalungun Regency and Pest Laboratory Faculty of Agriculture University of Sumatera Utara Medan from November 2014 to January 2015. The traps used. were yellow trap and pitfal trap. The result showed that there were 1.544 insects caught in yellow trap (10 ordos and 35 families) and 187 insects caught in pitfall trap 8 ordos and 18 families. The highest relative density of insects in yellow trap was 57.44% and the lowest valve was 0.13%. Where as, the highest relative density of pitfall trap was 39.57% and the lowest valve was 0.53%. Biodiversity a index of Shanon-Weiner (H') of yellow trap was 1.76 (medium) and the valve of biodiversity index of pitfall trap was 1.85 (medium)

Uji Efikasi Agens Hayati Terhadap Penyakit Hawar Daun Bakteri (Xanthomonas Oryzae Pv. Oryzae) Pada Beberapa Varietas Padi Sawah (Oryza Sativa)

Syahrial Damanik, Biological agents efficacy test to blight leaf disease Xanthomonas oryzae pv.oryzae on some rice varieties (Oryza sativa). The aim of this research was to find suitablebiological agens to inhibit attack from blight leaf disease and also to discover most resistentvarieties to wants Leaf Blight Disease.This research was conducted using randomized completelydesign (RCD) factorial consisting of two treatment factors and three replications. The first factornamely T0, T1, T2 (Control, Pseudomonas fluorescens, Trichoderma sp with Pseudomonasfluorescens) the second factor's variety V1, V2, V3 (Inpari 13, Mekongga, Ciherang).The result showed that on Biological agents treatment, the lowest disease intensity occured atTrichoderma sp with Pseudomonas fluorescens of 4.74 % and highest intensity disease occured atControl for 23.14 %. Varieties treatment had the lowest disease intensity in Ciherang for 7.79 %and highest disease intensity in Inpari 13 for 19.06 %. Interaction between biological agents andvarieties had the lowest disease intensity in Trichoderma sp with P. fluorescens and Inpari 13 for3.77 % and highest in Control and Mekongga for 33.97 %. The highest production in biologicalagents treatment occured in Trichoderma sp with P. fluorescens for 7.46 tons/ha and the lowest inControl for 3.63 tons/ha. The highest production on varieties treatment occured in Ciherang for 6.40tons/ha and the lowest in Inpari 13 for 4.98 tons/ha

Enkapsulasi Beberapa Jenis Trichoderma. SP. Pada Benih Kedelai Untuk Mengendalikan Penyakit Sclerotium Rolfsii Sacc.

Encapsulation of Some Trichoderma sp. on Soybean Seed to Control Sclerotium rolfsii Sacc. The research aimed was to get species of Trichoderma which mixed alginat or tapioca encapsulated soybean seed to inhibiting S. rolfsii. This research was conducted in Laboratory of Plant Disease, Faculty of Agriculture, University of Sumatera Utara, use Randomized Block Design 3 factors and sixteen treatments : alginate, tapioca, alginate + S. rolfsii, tapioca + S. rolfsii, alginate + T. harzianum, tapioca + T. harzianum, alginate + T. koningii, tapioca + T. koningii, alginate + T. viridae, tapioca + T. viridae, alginate + T. harzianum + S. rolfsii, tapioca + T. harzianum + S. rolfsii, alginate + T. koningii + S. rolfsii, tapioca + T. koningii + S. rolfsii, alginate + T. viridae + S . rolfsii, tapioca + T. viridae + S. rolfsi, respectively with four replications. The result showed that all of Trichoderma sp. isolates which mixed alginat or tapioca have high viability in inhibiting S. rolfsii. All of Trichoderma isolates enabled to reduce damping off on soybean seed. The treatments alginate + T. harzianum + S. rolfsii, tapioca + T. harzianum + S. rolfsii, alginate + T. koningii + S. rolfsii have high viability in inhibiting damping off by 100 % and followed tapioca + T. viridae + S. rolfsi and alginate + T. viridae + S . rolfsii (75%) and tapioca + T. koningii + S. rolfsii (50%)

Uji Ketinggian Dan Tipe Perangkap Untuk Mengendalikan Penggerek Buah Kopi (Hypothenemus Hampei Ferr.) (Coleoptera : Scolytidae) Di Desa Pearung Kabupaten Humbang Hasundutan

This research aims to know the efective height and type of trap which is most attack H. hampei in the field. The research was held at Pearung village, Sub-district Paranginan, District Humbang Hasundutan, North Sumatera from September until October 2014. The method used Randomized Block Design with two factors and three replications. The first factor was height of trap (1.0 ; 1.2 ; 1.4 ; 1.6 and 1.8 m) and the second factor was the type of trap (single funnel trap, multiple funnel trap, and mineral bottle). The results showed that the best trap was 1.2 m + multiple funnel trap, and the highest symptom percentage was 1.0 m + single funnel trap