Buletin Hama dan Penyakit Tumbuhan
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Parasitoid Telur pada Hama Kubis Plutella xylostella (L.) (Lepidoptera : Yponomeutidae)

Araz Meilin, Purnama Hidayat, Damayanti Buchori, Utomo Kartosuwondo

Buletin Hama dan Penyakit Tumbuhan Vol 12, No 1 (2000): Buletin Hama dan Penyakit Tanaman
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Abstract

Egg parasitoids of the diamonback mont, Plutella xylostella (L.) (Lepidoptera : Yponomeutidae) have never been reported in Indonesia. In this study, eggs of P.xylostella were collected from cabbage planation in Cisarua-Bogor, Ciloto-Cianjur, Cikole-Lembang (West Java), Tawangmangu (Central Java), and Malang (East Java). Three species of parasitoids were colleted from all areas, Trichogrammatoidea armigera Nagaraja emerged from eggs colledted from Cisarua-Bogor, Cikole-Lembang, and Ciloto-Cianjur, and Trichogramma flandersi Nagaraja and Nagarkatti (Hymenoptera : Trichogrammatidae) was only found from the eggs collected from Tawangmangu. The morphological character of the parasitoids are discussed

Host range of Phakopsora pachyrhizi Syd. the causal agent of soybean rust

Meity Sinaga

Buletin Hama dan Penyakit Tumbuhan No 3 (1979): Buletin Hama dan Penyakit Tumbuhan
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Abstract

A number of legume species were inoculated with Phakopsora pachyrhizi Syd. the causal agent of soybean rust. The species showing rust symptom were Pachyrhizus erosus, Crotalaria juncea, Glycine max var. si Nyonya, Vigna unguiculata, Phaseolus vulgaris (green bean), P. radiatus (mung bean), P. aureus, Psophocarpus tetragonolobus, Vigna umbellata and Calopogonium mucunoides.

Occurence of TMV-0 On Aranda Wendy Scott

Rusmilah Hari Suseno

Buletin Hama dan Penyakit Tumbuhan No 3 (1979): Buletin Hama dan Penyakit Tumbuhan
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Abstract

TKV-0 was identifled as the causal agent of a disease of Aranda Wendy Scott in Jakarta. Bioasssay showed that the virus prduced 10-1 lesirms m Cassia occidentalis, Chenopodium amzranticolor, Gornphrena ~l obosa , and Nicotiana glutinoaa . Observation of the "dig methoda preparation of diseaaed plant sap under the electron microscope indicated that the virus particles were rod-shaped and right with a length of about 300 mm.

Problems of Pest Management On Rice Crop In Tidal Swamp Areas

Uha Saharja Satari, Soemartono Sosromarsono

Buletin Hama dan Penyakit Tumbuhan No 3 (1979): Buletin Hama dan Penyakit Tumbuhan
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Abstract

The tidal swamp lands in Indonesia are potential areas for increasing food production especially rice. About 250.000 hectares of the swampy areas in suamtra and Kalimantan have been developed for rice production. Tidal swamp land has many interconnecting natural habitats wgich are economically and scientifically important. Agronomic activities in rice fields might have detrimental effects on other habitats. Therefore, agrochemicals especially pesticides for pest control, have to be carefully applied based on sound ecological approach. A Kind of pest management model is presented which consits of compatible combination of cultural control, use of resistant varieties, sanitation, and chemical control with environmentally least toxic pesticides if it is needed base on pest population count.

Effects of Mixed Infestation of Me[oidogyne incognita and Fungi Colonizing the Root-Gall Nematode on Soybean Growth

A. Muin Adnan, R. Suseno, S. Tjitrosoma, S. Radi, S. Wardojo, A. Rambe

Buletin Hama dan Penyakit Tumbuhan Vol 10, No 1 (1998): Buletin Hama dan Penyakit Tanaman
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Abstract

Laboratory and greenhouse experiments were carried out during April-October 1996 to investigate the response of three soybean varieties to the combined infestation ofMeloidogyne incognita (Kofoid & White) Chitwood and three root-gall nematode colonizing fungi (MCF). The experiments were done in a factorial completely randomized design with three replications. Treatments in laboratory test were combination of three soybean varieties, i.e. Black soybean (VI)´ Wilis (V z) and Lokon (V,J, two initial population densities of M. incognita, i.e. 0 and 300/200 ml growth medium, and three MCF species, i.e. Paecilomyces sp., Gliocladium catenulatum, and Trichoderma viride. The greenhouse treatments were the combination of three soybean varieties (Vb V2, V3), three initial population densities ofM. incognita (0, 1000, and 2000/4 I growth medium), and three MCF species. Result of laboratory tests showed that the combination ofM. incognita and three MCF species significantly reduced the damage levelofM. incognita and root weight loss. Reduction of shoot weight loss occurred only in slightly resistant and susceptible varieties in combination with PaeciIomyces sp. and G. catenulatum. Combination ofT. viride and M. incognita on three soybean varieties showed synergistic interaction. Result of greenhouse tests showed that all of the MCF isolates significantly reduced the damage level and the final population ofM. incognita. However, only Paecilomyces sp. could reduce the root weight loss, relative plant growth rate, and harvested seeds. These reducing effects were achieved on Lokon variety only, that is susceptible to M. incognita. There was no synergistic interaction between M. incognita and T. viride in the greenhouse test, even though the root colonization frequency of Trichoderma sp. on the susceptible variety was rather high.

The Effect of Nitrogen of Mycorriza on Pinus Merkusii

Chairil Anwar, Soetrisno Hadi, Sukandar Djokosuhardjo

Buletin Hama dan Penyakit Tumbuhan No 3 (1979): Buletin Hama dan Penyakit Tumbuhan
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Abstract

Mycorrhizae are symbiotic structure developed by the roots of plants and fungal mycelia. These mycorrhizae are often necessary for the growth of forest trees. This study was undertaken to determine the effect of the application of nitrogen and phosporus on the development of mycorrhizae in pinus merkusii. Andosol, collected in puncak, and latosol, collected in Darmaga, were used in this experiment. A seedling, transplanted into a pot containing 490 gr of dried soil, served as an experimental unit. Nitrogen ((NH4)2SO4) was applied at o ppm, 60 ppm, 120 ppm,

Periode Kritis Tanaman Tomat Terhadap Serangan Allernaria solani (Ell. & G. Martin) Sor. dan Faktor Penentunya

Sientje Mandang Sumaraw

Buletin Hama dan Penyakit Tumbuhan Vol 11, No 2 (1999): Buletin Hama dan Penyakit Tanaman
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Abstract

Critical Period of Tomato toAlternariasokuri (Ell. & G. Martin) Sor. infection and its determinant. Determination of critical period (susceptible period) of plant is one of the strategies in Integrated Pest Management (LPM), because it can reduce or minimize pesticide use. Study about the critical penendo of tomato was cam´ed out in the field of Bangbayang village, in the Cicwug district of Sukubumi. Tomato plant cultivar Zntan at dzremnt age (50, 60, 70 and 80 &ys after sowing [DAS] were inoculated with 15 ml of Id s p o ~ l suspension of Alternaria solani per plant, that have been added with Agristick 2% and llveen 80 2%. Observation that was conducted include disease severity, the height of plant, dry weight of plant biomass and total Jiuit production. Leaves of diferent age (50, 60, 70, 80 DAS) at d@rent part of plant (lower, middle and upper canopy) were analyzedfor totalprotein by Auto Analyzer ZZMethod, totalphenol by Follin- Denis Method and total sugar content by L u ~ h o o rMl ethod. The result showed that the older plant have the higher disease severity. The same trend can be seenjkm the age of leaves i.e. leaves fLom the lower part ofplants (olakr) am more susceptible than the middle and upper leaves. The critical period of the plant is at the age of 50 - 60 DAS. TotalJiuit production is not determined by disease severity, instead it is more determined by the age of plant infected. l%em is a tendency that the interaction among total protein and phenol content efect the susceptibility of the plant to the pathogen as can be seen the following regression equation: Y = 167 - 3.1 9 X2 - 22.58 X3 (R= 0.76).

Dinamika Populasi Spodoptera Exigua (Hubner) (Lepidoptera: Noctuidae) pada Pertanaman Bawang Merah di Dataran Rendah

Aunu Rauf

Buletin Hama dan Penyakit Tumbuhan Vol 11, No 2 (1999): Buletin Hama dan Penyakit Tanaman
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Abstract

The research was conducted in sub-district of Ciledug (Cirebon) with the objectives to study the infexiation and larvaal population development id onion armyworm. Spodoptera exigua (Habner) (Lepidoptera: Noctuidae), on shallots grown in lowland. Monitoring of egg masses and leaf damage were made at 3-4 days internal while of larvae at 1 week internal. Outbreak took place during the dry season of August-October 1995 when population density reached 0.8 egg mass and 23 larvae per hill, and subsequently all hills were heavily damaged. Throughout the rainy season of December 1995-February 1996, egg masses and larvae were difficult to find. Result of hand-picking showed that larval population during dry season was 78 times higher than those of rainy season. Larvae exhibited body color vartations. During the epidemics 80 percent of the larvae were dark whereas,during the endemics only 10 percent, the rest were light green. Level of egg parasitization was 0,9 percent coused by Tricogramma xp. (Hymenoptera; Trichogrammatidae) and telenomus sp. (hy menoptera; sceltonidae ), and larval parasitization 5.7 percent coused by Microplitis sp. (Hymenoptera; Braconidae), Euplectrus sp. and stenomesius sp (Hymeno[tera; Eulophidae), and Peribaea sp. (Diptera; Tachinidae). Low level of parasitization together with the abundance of food supply and dry season were believed to be the main foctors contributing to the population outbreaks. Hand-picking of egg masses and larvae conducted regularly, as practiced by the farmer group in the village of Dukuh wringin (Brebes(, should be adopted as a key activity for mitigating S. exigua infestation during dry season; and therefore, this practice should disseminated to farmers in other areas.

Uji Ketahanan Berbagai Varietas Kedelai Terhadap Fitoplasma

Asniwita Asniwita, Rusmilah Suseno, Sri Hendrastuti Hidayat, Budi Tjahjono

Buletin Hama dan Penyakit Tumbuhan Vol 11, No 2 (1999): Buletin Hama dan Penyakit Tanaman
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Abstract

It has been known that phytoplasma inducing witches broom disease can infect various kind of leguminous plants in Indonesia, among others soybean. Information on the resistance of various kind of soybean varieties to the phytoplasma is still limited. Experiments were conducted to eveluate the resistance of ten soybean varieties/lines to the phytoplasma. The evaluation was carried out by inoculation method through Orosius argentatus Evans, with two days of acquisition feeding period, ten days latent period and two days inoculation feeding period. Observation was conducted on the presence of phytoplasma, incubation period, symptom and number & weight of seed. The result indicated that line Malang 3474 was resistant, Sindiro and Sriono were tolerant, while the other tested varieties/lines, i.e. Galunggung, Orba, Ringgit, Wilis, Malang 2999, Malang 2805 and Sicinang were susceptible

Biological and molecular variability among PStV (peanut stripe virus) strains isolated from various peanut growing areas in Indonesia

Hasriadi Mat Akin, Sudarsono Sudarsono, Rusmilah Suseno

Buletin Hama dan Penyakit Tumbuhan Vol 11, No 2 (1999): Buletin Hama dan Penyakit Tanaman
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Abstract

Biological and molecular variability among PStV (peanut stripe virus) strains isolated from various peanut growing areas in Indonesia was studied based on their pathogenicity and coat protein genes. Six strains of PStV causing different types of symptoms on peanut leaves were used to study biological and molecular variability among these strains. Biological variability of the PStV strains was evaluated based on their pathogenicity on peanut cultivars, Gajah and Landak. While analysis of the coat protein gene was used to study the molecular variability of PStV strains. Based on their pathogenicity, six PStV strains could be grouped into three groups, medium, strong, and very strong strains. Analysis of a coat protein gene showed the variability of the PStV strains were 0-2.1percent based on nucleotide sequence and 0-1.4percent based on predicted amino acid sequence. There was no correlation between biological and molecular variability.

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