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INDONESIA
Jurnal Perlindungan Tanaman Indonesia
Published by Universitas Gadjah Mada
ISSN : 14101637     EISSN : 25484788     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Arjuna Subject : -
Articles 7 Documents
 1 
Search results for , issue "Vol 11, No 2 (2005)" : 7 Documents clear
Egg Predation Risk Trigger Adult Hoverfly (Diptera: Syrphidae) to Avoid Laying Eggs in Patches Attended by Ladybird Larvae (Coleoptera: Coccinellidae) Nugroho Susetya Putra; Hironori Yasuda
Jurnal Perlindungan Tanaman Indonesia Vol 11, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12100

Abstract

Oviposition preference of a predatory hoverfly, Episyrphus balteatus on the presence of its potential predators, the ladybird larvae which are inflicted serious impacts on its eggs was examined in a non-choice test. Our results revealed that the biggest and the most aggressive species of ladybird, Harmonia axyridis caused the worst impact on hoverfly eggs by attacking and feeding on. The species and developmental stages of ladybird were attributed to the level of predation risk. We correlated the oviposition site selection by hoverfly females to the egg predation risk level inflicted by ladybird larvae. Hoverfly females laid the least number of eggs on the patches attended by the strongest competitor, the larva of H. axyridis, and tended to lay the highest number of eggs on colonies attended by the weakest competitor, the larva of Scymnus posticalis. In addition, the impact of the fourth instar larva of ladybirds was stronger than of the first instar larva.
Kemampuan Pseudomonas putida Pf-20 dan 24.7B untuk Memperbaiki Sifat Kimia Media Tumbuh dan Ketahanan Terinduksi Tembakau H877 terhadap Cucumber mosaic virus W. S. Wahyuni; A. Iwan; A. Mudjiharjati; T. C. Setyowati; H. Purwiko
Jurnal Perlindungan Tanaman Indonesia Vol 11, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12085

Abstract

P. putida Pf-20 from medium M1 (paddy soil, leaves compost and manure compost, 1:3:2) has a higher affinity and more rapid to solubilize phosphate on Pikovskaya medium, rather than P. putida 27.4B. Those affinities of both strains from the media M1 with CMV-48 were much greater than that of medium without CMV. After 64 days planted, the content of N total, C-organic, CEC, K20, and P205 were better on medium M1, but the pH was little bit decreased. The reduction of P04 and Fe in medium M1 could due to the bacterial growth, and for producing siderophore, particularly on the media with viral treatment. These bacteria strains did not affect on the plant height and number of leaves on media M1, M2 or M3, however, these bacteria affected on the total root length and root densities in the medium M1 with virus. The more available nutrient in the medium, the more rapid bacteria colonized rhizosphere and roots. Both of these bacteria were effective to reduce the disease severity of CMV on tobacco H877. The medium M1 was the best medium for bacterial and tobacco growth.
Isolasi dan Karakterisasi Kitinase Akar Tusam (Pinus merkusii Jungh. et de Vriese) Roots yang Bersimbiosis dengan Fungi Ektomikoriza A. Handayani; S. M. Wisyastuti; S. Margino
Jurnal Perlindungan Tanaman Indonesia Vol 11, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12099

Abstract

The experiment was aimed to detect the activity and characterize the chitinase of tusam root during ectomycorrhizal symbiosis. Tusam inoculated with tusam stands soil from Kaliurang as fungi inocula. Crude proteins were isolated from 4, 6, and 8 weeks age of tusam. Chitinase activity and isoform were detected using glycol chitin as a subtrat. The enzyme was purified by ammonium sulfat precipitation, dialysis, followed by gel filtration chromatography. The results showed that tusam prodced chitinasse with a molecular weight of approximately 52kDa. The optimum activity was at pH 5 and temperature of 30°C.
Isolasi dan Karakterisasi Β-1,3-Glukanase Akar Semai Tusam (Pinus merkusii Jungh. et de Vriese) yang Berasosiasi dengan Fungi Ektomikorisa M. D. Anggoro; S. M. Widyastuti; S. Margino
Jurnal Perlindungan Tanaman Indonesia Vol 11, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12086

Abstract

Association between tusam (Pinus merkusii Jungh. et de Vriese) seedling roots with ectomycorrhiza fungi was expected to increase the activity {β-1,3-glucanase level in the plants. This enzyme has potency to protect seedling from soil borne fungal pathogens by degrading the fungal cell walls. The objectives of this research were to isolate and characterize β-1,3-glucanase from tusam seedling roots associated with ectomycorrhiza fungi. Crude protein was isolated with ammonium sulfat precipitation and then purified by gel filtration chromatography and characterize molecular weight, temperature and pH for optimum the activity. The enzyme from tusam seedling roots associated with ectomycorrhizal fungi, designated as GLUC15 have 15 kD molecular weight, 30° - 40° C temperature and pH 5-7 for optimum activity.
Pengelolaan Lingkungan dalam Rangka Mengantisipasi Perkembangan Hama Belalang Nomadacris succincta Linnaeus (Orthoptera: Acrididae) Sri Suharni Siwi; Trisnaningsih Trisnaningsih; Harnoto Harnoto
Jurnal Perlindungan Tanaman Indonesia Vol 11, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12102

Abstract

Swarming grasshopper Nomadacris succincta (Linnaeus), sinonim: Patanga succincta (L.) was one of the dominant species attacked corn and soybean plantations at Jeneponto District, South Sulawesi in early 2005. The species has been identified for a long time occurred in that environment, although has never been reported before as pest of farmer's crops. For a basis of the capability in controlling the swarm grasshopper in the field, changed of increasing population hould be monitored regularly to prevent future outbreak. Information on taxonomic and ecology research of N. succincta are needed for environmental management efforts, such as change in morphology, physiology and behavior, change in host's preferences of gregarious adult, and environmental conditions i.e. climate, cultural techniques, and the death of natural enemies in the field.
Effect of Enhancing Factor on The Developmental Resistance of Pseudaletia separata Larvae Orally Inoculated with Pseudaletia unipuncta Nucleopolyhedrovirus Arman Wijonarko; Hamano Kunikatsu
Jurnal Perlindungan Tanaman Indonesia Vol 11, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12101

Abstract

Larvae of lepidopteran insect become increasingly resistant to baculovirus infection as they age. The mechanism for this resistance is not known yet, but the phenomenon does not occur when an enhancing factor was added to the viral inoculum. This observation indicated that the mechanism of resistance occur during primary infection within midgut. By assessing the fusion of positive microvillus cell using flow cytometer, we indicated that enhancing factor may somehow help the virus to fuse in the midgut of older insect.
Colonization of Tomato Root by Antagonistic Bacterial Strains to Fusarium Wilt of Tomato Arif Wibowo
Jurnal Perlindungan Tanaman Indonesia Vol 11, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12084

Abstract

Fusarium wilt of tomato caused by Fusarium oxysporum f.sp. lycopersici (Fol) is an important disease in tomato which cause a significant loss of yield in major growing regions of the world. This study examined the ability of bacterial strains antagonistic to F. oxysporum f.sp. lycopersici (H5, H22, H63, H71, Burkholderia cepacia strain 65 and 526) to colonize tomato seedlings and the effect of plant growth. The effect of bacterial population size and air temperature on the bacterial colonization and their spread along the root systems was also assessed.The results of this study showed that the bacterial population at 28°/23° C day/night temperature 14 days after planting was significantly greater than 23°/18° C for 4 of 6 strains tested. Although there was no significant effect of temperature on bacterial population observed in this study, the ability of the baacterial strains to colonize the rhizosphere was significantly different. Three strains (H5, B. cepacia strain 65 and 526) survived well in the rhizosphere and at 4 weeks after planting rhizosphere populations per gram fresh root were not significantly different from those recovered 2 weeks after planting. The largest population of the bacterial inoculants developed in the basal region of the roots and this differed between strains by log10 2.7 cfu/cm root. The bacterial populations in other parts of the root were also strain dependent. Strain H71, for example, was able to colonize the root segments at a high population level. However strain H63 was recovered only in small number in all root segments.

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