Archive for April, 2013

PENGUJIAN PENGHAMBATAN AKTIVITAS MAKAN DARI EKSTRAK DAUN Lantana camara L. (Verbenaceae) TERHADAP LARVA Plutella xylostella L. (Lepidoptera: Yponomeutidae)

 

Evaluation of Antifeedant activity of Leaf Extract Lantana camara L. (Verbenaceae) against Larva Plutella xylostella L. (Lepidoptera: Yponomeutidae)

Khaidir dan Hendrival

Program Studi Agroekoteknologi Fakultas Pertanian Universitas Malikussaleh,

Reuleut, Aceh Utara. Email penulis ke dua: hendrival@yahoo.com

ABSTRACT

Research on antifeedant activity of n-hexane leaf extract Lantana camara and its active fractions were evaluated for their insecticidal activity against Plutella xylostella larvae. The method included extraction, fractionation, and examination antifeedant leaf extract L. camara and fractions active against P. xylostella larvae. Extract application was conducted using a residue feeding method. Fractionation of active compounds from extract n-hexane was conducted by liquid vacuum chromatography, using phase silent silicate gel GF254­ and phase mobility n-hexane, ethyl acetate, and methanol (elusion gradient), which produce fractions A, B, C, D, and E. Extract leaf L. camara and fractions possessed antifeedant activity against P. xylostella larvae. Extract leaf L. camara at concentration of 1% caused larva antifeedant activity up to 78.47%. Fraction E caused a higher larva antifeedant activity (85,52%) than extract and other fractions did.

Keywords: antifeedant, Lantana camara, Plutella xylostella

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MENGENDALIKAN Crocidokomia pavonana F. PADA TANAMAN SAWI

Effectiveness of Leaf Extract of Bitter Melon (Momordica charantia) In Controling Crocidokomia pavonana F. On Mustard

Hasnah, Husni, dan Nezpi Noza Purnama

Prodi Agroteknologi Fakultas Pertanian, Universitas Syiah Kuala, Darussalam Banda Aceh. Email penulis pertama: azzambelfas@gmail.com

ABSTRACT

The purpose of this study was to obtain effective concentrations of leaf extracts of bitter melon in controlling Crocidolomia pavonana on mustard (Brassia juncea Linn). The experiment was conducted at Laboratory of Plant Pests and Diseases, Faculty of Agricultural Kuala University, Banda Aceh. The study took place from August to November 2010. The experiment was arranged in a Completely Randomized Design (CRD), with six concentration of 0, 5, 10, 15, 20, and 25 ml/L solution. Each treatment was repeated 4 times to obtain 24 units of the experiment. Variables observed were mortality of larvae C. pavonana, formed pupa percentage, emerging imago percentage and feeding deterrent percentage. The results showed that application of leaf extract of M. charatia could control C. pavonana on mustard. The higher concentration of the leaf extract was given, the more effective control was against C. pavonana on mustard plant. The use of leaf extracts M. charantia in concentration of 20% was able to control C. pavonana up to 60%.

Keywords: bitter melon, Crocidokomia pavonana, mustard, leaf exttact

KEMAMPUAN ANTAGONIS Trichoderma sp. TERHADAP BEBERAPA JAMUR PATOGEN IN VITRO

The Ability of Antagonist Trichoderma sp. Against Some Pathogenic Fungus In Vitro.

Alfizar, Marlina, dan Fitri Susanti

Prodi Agroteknologi Fakultas Pertanian,Universitas Syiah Kuala, Darussalam Banda Aceh. Email penulis pertama: aalfizar@yahoo.com

ABSTRACT

Pathogens often cause disease in plants, causing losses both in quality and quantity, and frequently can cause death on plants cultivated. Biological control begin to be selected in control of pathogens. Antagonist agent Trichoderma is known to control fungal pathogens causing plant diseases. This study looked over inhibition effects of Trichoderma sp. against pathogenic fungi; C. capsici, Fusarium sp. and S. rolfsii. This research was conducted at Laboratory of Plant Pathology Faculty of Agriculture, Syiah Kuala University from April to August 2012. The study began with isolation of the pathogen obtained from chili and soybean crops infected in the field.. Pathogenic fungi isolated were Colletotrichum capsici, Fusarium sp. and Sclerotium rolfsii. Variables observed were wide and diameter colony of Trichoderma sp., diameter colony of pathogens, and the percentage of inhibition. The results showed that Trichoderma sp., had ability to inhibit the growth of pathogen Colletotrichum capsici, Fusarium sp. and Sclerotium rolfsii in vitro. The highest percentage of inhibition of Trichoderma sp. was 68,2% against Colletotrichum capsici, followed by 53,9% against Fusarium sp., and the lowest inhibition was against Sclerotium rolfsii (35.5%).

Keywords: Trichoderma sp., Antagonist, Pathogens, In vitro, Percentage of inhibition

PENGUJIAN PENGHAMBATAN AKTIVITAS MAKAN DARI EKSTRAK DAUN Lantana camara L. (Verbenaceae) TERHADAP LARVA Plutella xylostella L. (Lepidoptera: Yponomeutidae)

 

Evaluation of Antifeedant activity of Leaf Extract Lantana camara L. (Verbenaceae) against Larva Plutella xylostella L. (Lepidoptera: Yponomeutidae)

Khaidir dan Hendrival

Program Studi Agroekoteknologi Fakultas Pertanian Universitas Malikussaleh,

Reuleut, Aceh Utara. Email penulis ke dua: hendrival@yahoo.com

ABSTRACT

Research on antifeedant activity of n-hexane leaf extract Lantana camara and its active fractions were evaluated for their insecticidal activity against Plutella xylostella larvae. The method included extraction, fractionation, and examination antifeedant leaf extract L. camara and fractions active against P. xylostella larvae. Extract application was conducted using a residue feeding method. Fractionation of active compounds from extract n-hexane was conducted by liquid vacuum chromatography, using phase silent silicate gel GF254­ and phase mobility n-hexane, ethyl acetate, and methanol (elusion gradient), which produce fractions A, B, C, D, and E. Extract leaf L. camara and fractions possessed antifeedant activity against P. xylostella larvae. Extract leaf L. camara at concentration of 1% caused larva antifeedant activity up to 78.47%. Fraction E caused a higher larva antifeedant activity (85,52%) than extract and other fractions did.

Keywords: antifeedant, Lantana camara, Plutella xylostella

PEUBAH LAJU TUMBUH RELATIF DAN PROTEIN BERPERAN PENTING DALAM MENINGKATKAN KUALITAS BENIH KEDELAI (Glycine max L. Merr)

Relative Growth Rate and Protein Are Key Variables In Improving Seed Quality of Soybean (Glycine max L. Merr)

Rudi Hartawan

Prodi Agroteknologi, Fakultas Pertanian Universitas Batanghari,

Jalan Slamet Riyadi, Jambi 36122. Email: rudi2810@yahoo.com

ABSTRACT

Variables of seed quality are correlated each others, especially in storage. This fact needs investigation to predict main variables for measuring seed quality at storage. The objectives of this study were to investigate the main variables on growth analysis and seed quality using path analysis in production of extension seed. The field trial was carried out at Sebapo Experimental Station, Jambi and laboratory works were conducted in the Center for Post Harvest Research and Development, The Ministry of Agriculture and Center for Forest Research and Development, The Ministry of Forestry, Bogor from April until December 2010. The experimental design used was an unformatted design. The research showed that relative growth rate and protein were the main variables to improve soybean seed quality.

Keywords : Seed technology, soybean, seed quality, relative growth rate, protein

EFEK ALELOPATI Ageratum conyzoides TERHADAP PERTUMBUHAN SAWI

Effects of Allelopathy of Ageratum conyzoides on Mustard Growth

Siti Hafsah, M.Abduh Ulim, dan Cut Mutia Nofayanti

Program Studi Agroteknologi Fakulas Pertanian, Universitas Syiah Kuala, Banda Aceh. Email penulis pertama: cyti_lbs@yahoo.co.id

ABSTRACT

This study was aimed at determining concentration of allelopathy Ageratum conyzoides that suppresses growth of mustard. The research was conducted in Weeds Laboratory and Screen House Agriculture Faculty, University of Syiah Kuala, Darussalam, Banda Aceh from December 2010 to February 2011. The experiment was arranged in a completely randomized design (CRD) with 6 treatments and 4 replicates. Results showed that inhibition occurred at concentrations of 100 gL-1 at 10 HST on plant height, leaf number and dry weight of mustard plant. Optimum inhibitory concentration of the liquid squeezed leaves of A. conyzoides on mustard was at a concentration of 300 gL-1. At the highest concentration (500 g/l), A. conyzoides inhibited germination up to 100%.

Keywords: Ageratum conyzoides, mustard., Concentration, allelopathy

PENGARUH UMUR KECAMBAH DAN DOSIS PUPUK UREA TERHADAP PERTUMBUHAN BIBIT KAKAO

Effects of Seedling Ages and Urea Dosages on Seedling Growth of Cacao

Erida Nurahmi, Yuswar Yunus dan Yennita

Prodi Agroteknologi Fakultas Pertanian, Universitas Syiah Kuala,

Banda Aceh. Email penulis pertama: erida.riri@ymail.com

 

ABSTRACT

Cacao is an important plantation plant in Indonesia for its contribution to our income. The productivity of this plant still have a chance to be increased, with the improvement in culture technique. One limited information concerning the cacao cultivation technique is seedling ages and urea dosages when transplanting. The purposes of this research were to find out the effect of seedling ages, urea dosages, and interaction between them on cacao seedling growth at nursery. Research was conducted at Experimental Station of Agriculture Faculty, University of Syiah Kuala. Units of treatment were arranged according to Factorial Randomized Complete Block Design with 4 replicates, followed by Honestly Significant Different Test at the level of 5%. Seeds were extracted from 1/3 of cacao mature fruits at the center of the pod and germinated in germination box filled with sand and covered by wet towel. Growing medium used was top soil:manure:sand=2:1:1 (by volume). Variables observed were seedling height, stem diameter, leaf number and area, primary root length, and wet and dry mass of seedling at 45, 60 75 and 90 days after transplanting. Results showed that there were significant interactions between treatments on all variables observed. The best combination was age of 10 days of seedling and dosage of 2 g urea per polybag.

Keywords: Theobroma cacao, plant transplanting, seedling ages, urea dosages, seedling growth