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INDONESIA
JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Published by Universitas Lampung
ISSN : 14117525     EISSN : 24610399     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Jurnal Hama dan Penyakit Tropika (JHPT Tropika) publishes articles in plant pests, plant pathogens, plant damage caused by those pests and pathogens and or their management in tropical areas. In addition to basic and applied research papers, JHPT Tropika publishes short communication that have not been published. Before being accepted for publication, all manuscripts must be peer reviewed. The journal is published sixmonthly in March and September.
Arjuna Subject : -
Articles 6 Documents
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Search results for , issue "Vol. 2 No. 1 (2002): MARET, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA" : 6 Documents clear
EFIKASI SERBUK TUMBUHAN DALAM MENGENDALIKAN PENYAKIT BUSUK PANGKAL BATANG LADA DI LAPANGAN Cipta Ginting , Dad R.J. Sembodo, dan Herry Susanto hpt
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 2 No. 1 (2002): MARET, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (65.431 KB) | DOI: 10.23960/j.hptt.1215-19

Abstract

The efficacy of plant powder to control foot rot on black pepper in field condition. One of the problems in cultivating black pepper (Piper nigrum L.) is foot rot caused by Phytophthora capsici Leonian (P. palmivora MF4), that could kill the plants in only few days especially during rainy season. The objective of this experiment was to evaluate the efficacy of several plant powder to control the disease in semi-field condition. The experiment was conducted at the experiment station located at the campus of the University of Lampung from May to October of 2000. The semi-field condition was made by pushing a barrel into the soil to isolate the field soil as testing medium from the rest of the field soil. The treatments were arranged in a randomized complete block design with five replications and consisted of the rhizomes of Zingiber officinale, Alpinia galanga, and Kaempferia galanga, whole plant of Cymbopogon citratus and Elephantopus scaber, metalaxyl, and untreated control. To prepare the plant powder, each material was cut into small pieces then dried in oven at 50o C for 4 days and then ground in a blender. The powder was applied 3 days after inoculum infestation. The powder and inoculum was mixed with soil to the depth of 12 cm so that the soil contained 2% each. After one week, four plants were planted. As additional bioindicator to detect infective inoculum, eight leaf portions were pressed into the soil so that half of the leaf was bellowed the soil line. The plants were watered and observed daily. To determine viable fungal propagules, soil sample was taken weekly for five weeks. Soil assay was done with dilution technique using PDA supplemented with rosebengal. The results of the observation show that the treatments did not influence significantly the disease intensity on leaf portions or the whole plants. There were no significant differences on viable fungal propagules in soils received different treatments.
EFEK PENGHAMBATAN EKSTRAK DAUN WIDURI (CALOTROPIS SP.) TERHADAP CENDAWAN BUSUK BUAH CABAI (COLLETOTRICHUM CAPSICI) Puji Sulaksono , Umrah, Ramadhanil Parhan K. Lamai dan Ramlah Binangkari .
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 2 No. 1 (2002): MARET, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (70.949 KB) | DOI: 10.23960/j.hptt.1220-25

Abstract

Inhibitory effect of widuri (Callotropis sp.) leaf extract on Colletotrichum disease of chilli pepper. Inhibitory effect of widuri (Callotropis sp.) leaf extract (WLE) was determined against radial growth, conidial germination, conidial production on red pepper pod lesions and number of lesions formed on the pod. It was found that, compared with control (no WLE), over 50 % radial growth inhibition was recorded 10 days after WLE application at concentrations of 0.5 % or higher. Inhibitions at similar rate were also found on conidial germination 24 hours after WLE application at concentrations of 8 % or higher. WLE at concentrations of 8 % or higher reduced the number of lesion formation up to at least 50 % 8 days after inoculation of the pathogen. At least 50 % reduction in the conidial production was recorded when WLE was applied at concentrations of 4 % or higher.
BEBERAPA HASIL INOKULASI PADA CAKRAM DAUN KOPI DENGAN HEMILEIA VASTATRIX DI LABORATORIUM Cipta Ginting , Abdul Gafur, dan Rusdi Evizal .
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 2 No. 1 (2002): MARET, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (61.157 KB) | DOI: 10.23960/j.hptt.1226-31

Abstract

Some results of inoculations on coffee leaf disks with Hemileia vastatrix. Leaf rust caused by Hemileia vastatrix B. et Br. is the most important disease on coffee worldwide. The obligate nature of H. vastatrix limits research on the disease when inoculation or pathogen growth in laboratory is required. Inoculation on detached plant parts such as leaf disks may become an alternative to solve the problems. In this study, the procedure was tested using three coffee varieties (Kartika 1, USDA, and Robusta) as inoculum sources, leaves of different age, and different uredospore concentrations (4 x 103, 4 x 104, and 4 x 105 uredospores per ml suspension). The study was done in Laboratory of Plant Disease at University of Lampung from May to December 2001. Uredospores developed on leaves under field condition were used as inoculum. The uredospores were taken with sterilized scalpel and placed in sterilized distilled water. Before doing the experiments, the uredospores were measured using microscope equipped with a micrometer. The concentration of uredospore suspensions were prepared using hemacytometer. Leaf disks made with diameter of 2 cm were used in all inoculations. The results showed that the size of the uredospores varied greatly. The variation occurred not only among uredospores taken from different lesions or leaves but also among those taken from the same lesions. The size of almost all uredospores was the same as that reported in the literature. Uredospores taken from Kartika (but not from two other varieties) incited disease development and produced symptoms on leaf disks which were made from Kartika coffee. The age of leaves used to make leaf disks did not influence disease incidence. Uredospores concentration influenced ( = 0.05) disease incidence on leaf disks with higher concentration caused higher disease incidence .
PENGARUH FRAKSI AKTIF KULIT BATANG DYSOXYLUM ACUTANGULUM MIQ. (MELIACEAE) TERHADAP REPRODUKSI CROCIDOLOMIA PAVONANA (F.) (LEPIDOPTERA: PYRALIDAE) Edy Syahputra, Djoko Prijono, dan Partomuan Simanjuntak .
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 2 No. 1 (2002): MARET, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (91.454 KB) | DOI: 10.23960/j.hptt.121-7

Abstract

Effects of an active fraction of stem bark of Dysoxylum acutangulum Miq. (Meliaceae) on reproduction of Crocidolomia pavonana (F.) (Lepidoptera: Pyralidae). This study was conducted to determine the effect of an active fraction of Dysoxylum acutangulum stem bark on reproduction and longevity of the cabbage pest Crocidolomia pavonana. The feeding treatment with the test material was given to the second-instar larvae C. pavonana at concentrations of 2.54, 3.29 and 3.93 ppm (equivalent to LC10, LC30 and LC50), then the emerging adults were observed for their fecundity, ovarial protein content and longevity. The treatment with the test material at LC50 shortened the lifespan of adult males and females C. pavonana by 2.9 and 1.6 days, respectively, compared with controls. The treatments at LC10, LC30 and LC50 decreased the fecundity of the adult females by 44.0, 64.7 and 58.1%, respectively, compared with controls, and this effect could be associated with the decrease in protein content of ovaries of the females (29.0, 47.8 and 42.8% decrease, respectively). Such treatments also delayed the maturity of ovaries of the females. Suppression of reproductive capacity of C. pavonana could contribute significantly to overall suppression of the pest population if the test material is used in the field.
EFFECTS OF CULTIVAR-TILLAGE SYSTEM COMBINATION ON MYCORRHIZAL POPULATION Joko Prasetyo and Sri Yusnaini .
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 2 No. 1 (2002): MARET, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (33.266 KB) | DOI: 10.23960/j.hptt.1232-34

Abstract

Pengaruh kombinasi sistem olah tanah dan varietas terhadap populasi mikorisa. Suatu penelitian telah dilakukan untuk mengetahui pengaruh kombinasi sistem olah tanah dan varietas terhadap populasi mikorisa. Penelitian terdiri atas empat perlakuan yang disusun dalam rancangan acak kelompok. Perlakuan tersebut adalah varietas RR ditanam pada sistem olah tanah konservasi (RRCT), varietas C7 ditanam pada sistem olah tanah konservasi (C7CT), varietas C7 ditanam pada sistem olah tanah sempurna (C7FT), dan varietas Bisma ditanam pada sistem olah tanah sempurna (Bisma FT). Hasil penelitian menunjukkan bahwa pada pengamatan pertama C7FT secara nyata menurunkan populasi mikorisa dibandingkan dengan Bisma FT. Pengamatan kedua, sistem olah tanah dan varietas tidak berpengaruh terhadap populasi mikorisa. Pada pengamatan ketiga menunjukkan bahwa RRCT secara nyata dapat menurunkan populasi mikorisa dibandingkan dengan Bisma FT.
INSECT PESTS IN AGROECOSYSTEM WHERE THREE CORN VARIETIES WERE GROWN UNDER CONSERVATION VERSUS FULL TILLAGE SYSTEM IN NATAR, SOUTH LAMPUNG IN 2001 GROWING SEASON F.X. Susilo and I Gede Swibawa .
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 2 No. 1 (2002): MARET, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (110.249 KB) | DOI: 10.23960/j.hptt.128-14

Abstract

Serangga hama pada pertanaman jagung yang dibudidayakan dengan olah tanah konservasi di Natar Lampung Selatan pada musim tanam 2001. Penelitian sebelumnya (musim penghujan 2000) menunjukkan bahwa serangga yang berpotensi menjadi hama tanaman jagung di Lampung Selatan adalah lalat bibit jagung (LBJ) (Atherigona sp.) yang tidak selalu dapat diatasi dengan perlakuan benih dan penggerek tongkol (Helicoverpa armigera) yang serangannya terbatas pada ujung tongkol. Penelitian pada tahun ini (musim kemarau 2001) dilakukan untuk menjawab beberapa pertanyan berikut: (1) Apakah ada serangga lain yang berpotensi menjadi hama pada tiga varietas jagung yang dibudidayakan dengan olah tanah konservasi (OTK) versus olah tanah penuh (OTP)? dan (2) Sejauh manakah serangan lalat bibit jagung dan Helicoverpa pada tahun ini? Informasi terkini yang diperoleh adalah sebagai berikut. Selain diserang oleh LBJ dan Helicoverpa, pertanaman jagung tahun ini diserang pula oleh wereng coklat (WCJ) (Nilaparvata sp.) dan penggerek batang (PBJ) (Ostrinia sp.) Serangan LBJ dapat menyebabkan berkurangnya populasi tanaman produktif sebesar < 1% dan 4&mdash;12%, berturut-turut pada sistem OTK dan OTP. Dibandingkan dengan pemulsaan (kegiatan utama dalam OTK), perlakuan benih menggunakan insektisida imidacloprid kurang efektif untuk mengendalikan serangan LBJ. WCJ cenderung lebih menyerang pertanaman jagung (apa pun varietasnya) yang dibudidayakan dengan OTK. Belum nampak adanya kecenderungan serangan PBJ pada salah satu varietas jagung atau pada satu di antara dua sistem olah tanah yang diuji. Selain menyerang tongkol seperti pada tahun sebelumnya, Helicoverpa pada tahun ini juga menyerang daun. Pada tahun ini serangan pada tongkol berlanjut sehingga menimbulkan kerusakan biji.

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