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KARAKTERISTIK MORFOLOGI DAN SEBARAN TIPE KAWIN PHYTOPHTHORA CAPSICI ASAL LADA DI PULAU JAWA Rohmah, Bahru; Hadisutrisno, Bambang; Manohara, Dyah; Priyatmojo, Achmadi
Jurnal Fitopatologi Indonesia Vol 14 No 5 (2018)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1843.901 KB) | DOI: 10.14692/jfi.14.5.166

Abstract

Morphology characters and mating types distribution of Phytophthora capsici from black pepper in Java IslandPepper (Piper nigrum) is one of the most important spice crops in Indonesia.  Recently its production declining due to infection of foot rot disease caused by Phytophthora capsici. This pathogen has two different mating types, namely A1 and A2, in which the presence of opposite two mating types is important for sexual reproduction and formation of oospores. The movement of pepper seedling from one area to another is highly facilitated alteration of  mating type distribution map of P. capsici. The objectives of this research were to determine the morphological characteristics and the spread of mating types of P. capsici in Java. Morphology characters of P. capsici isolates were indicated by variation in sporangial size and shape, as well as types of colony appearance. The length (l) and width (w) of sporangium were in the range of 15.1?76.2 µm and 9.8?44.8 µm, respectively; while the l/w ratio was 1.12?2.27. Mating type assay showed that A2 type was more dominantly found than A1 type. This study found two different mating types present in the same area, i.e. Regency of Pacitan (East Java) and Regency of Sleman (Special Region of Yogyakarta). The findings of this research suggested that it is required more strict control strategy on the mobilization of black pepper seedling particularly in the area where the certain mating type is not found yet so that the emergence of new more virulent genotype of pathogen can be prevented.
MASA INKUBASI GEJALA PENYAKIT HAWAR DAUN TANAMAN KENTANG YANG DIINDUKSI KETAHANANNYA OLEH JAMUR ANTAGONIS TRICHODERMA VIRIDE Purwantisari, Susiana; Priyatmojo, Achmadi; Sancayaningsih, Retno Peni; Kasiamdari, Rina Sri
Bioma : Berkala Ilmiah Biologi Vol. 18, No.1, Tahun 2016
Publisher : Departemen Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (62.469 KB) | DOI: 10.14710/bioma.18.2.41-47

Abstract

Late blight disease caused by Phytophthora infestans, is probably the single most important disease of potatoes worldwide. Infected plants were quickly killed and were difficult for replanting, causing significant losses for the growers. Various control methods were examined including the use of biocontrol agents of Trichoderma spp.  The biocontrol potential of Trichoderma viride against potato late blight pathogen, Phytophthora infestans, were studied  under greenhouse conditions. The research objective was to determine the ability of biocontrol agents Trichoderma viride to delay late blight disease incidence on potato plants in the field. The in vivo experiment was carried out at potato land area located at BALITSA in Cikole Sub District, Lembang District and Bandung Regency. Completely Randomized Design was used with six treatment and five replicates. The treatment tested consist of control (without pathogen fungal and antagonists fungus application too), control (with pathogen fungal application and without antagonist fungal application), chemical fungicide application, antagonist fungal application 2 weeks before planting, application 1 week after planting and both application 2 weeks before and 1 week after planting. Result of the research showed that application of antagonists fungal could delay disease intensity until 14 days. These antagonist could be used as biological agents initials to control leaf blight disease. Key words: Biological control, Potato late blight, Phytophthora infestans, Trichoderma viride
Peranan Faktor Cuaca terhadap Infeksi dan Perkembangan Penyakit Bercak Ungu pada Bawang Merah Hadisutrisno, Bambang; Sudarmadi, Sudarmadi; Subandiyah, Siti; Priyatmojo, Achmadi
Jurnal Perlindungan Tanaman Indonesia Vol 1, No 1 (1995)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.9351

Abstract

Purple blotch disease caused by Alternaria porri (Ell.) Cif. is one of the most important diseases on shallots. The farmers have been using fungicides as a reliable control method, however, the chemical control method has to be considered for the negative effect on the environment and the danger to the other species and causes the resistance to a certain pesticide. Therefore, it is important to develop other method that is safe, effective, and efficient, like the use of climatic data to decide the control strategy.The result of the study on ecology of purple blotch disease carried out at the experimental station in Kramat-Tegal, Kledung-Temanggung, and KP4 Kalitirto in dry and rainy season (1991/1992) suggested that climatic factors played on important role on the daily conidium dissemination of Alternaria porri and on the intensity of purple blotch disease. Daily conidium dissemination which was one of the important component in the epidemy of purple blotch disease was influenced by the temperature, relative humidity, and the wind velocity. Conidium dissemination was occurred both during the day and night and at 10.00 am-14.00 pm when the air temperature and wind velocity were high with low relative humidity, conidium dissemination was maximum. On the other hand, at 22.00 pm – 02.00 am there was minimum conidium dissemination.The result on the effects of leaf wetness period on disease intensity suggested that high humidity was not the only factor caused disease infection but it has to be supported by the presence of thin film water on the leaf surface at least for 4 hours since the attachment of the conidia on the leaves.Key words: purple blotch, climatic factor, Alternaria porri, shallot
Tipe Mating pada Empat Isolat Thanatephorus Cucumeris Anamorf: Rhizoctonia solani) Anastomosis Group (AG) 1-IC Priyatmojo, Achmadi
Jurnal Perlindungan Tanaman Indonesia Vol 12, No 2 (2006)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12077

Abstract

Four parent isolates (189, Rh28, BW3 and F-1) of Thanatephorus cucumeris (anamorph: Rhizoctonia solani) AG 1-IC were induced to produce basidiospores using soil-over culture method. All of four parent isolates could produce basidiospores. Colonies obtained from single basidiospore isolate of each parent isolate were paired on charcoal potato dextrose agar. Single basidiospore isolate having different mating type produced tuft at area of the junction of paired colonies. On the based of tuft formation, single basidiospore isolates of each parent isolate could be divided into two different mating types, therefore it is concluded that each of 189, Rh28, BW3 and F-1 isolate of T. cucumeris AG I-IC has bipolar mating type.
Ekstraksi DNA Phytophthora palmivora Isolat Kelapa Priyatmojo, Achmadi; Subandiyah, Siti
Jurnal Perlindungan Tanaman Indonesia Vol 2, No 1 (1996)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6570.787 KB) | DOI: 10.22146/jpti.9358

Abstract

Coconut isolate of Phytophthora palmivora DNA was extracted from sporangium and mycelium using SDS and Proteinase-K method. Sporangium and mycelium were harvested from liquid and solid culture of Potato Dextrose medium.The result of the study showed that the DNA extracted from sporangium and mycelium of 8 days solid culture was seen as distinct band. On the other hand, the dNA from sporangium and mycelium of 24 days old liquid culture was fragmented with smear band appearance.Key words: DNA, Phytophthora palmivora
PENAPISAN CENDAWAN TRICHODERMA SPP. UNTUK PENGENDALIAN PHYTOPHTHORA INFESTANS SECARA IN VITRO Purwantisari, Susiana; Priyatmojo, Achmadi; Sancayaningsih, Retno Peni; Kasiamdari, Rina Sri
Jurnal Fitopatologi Indonesia Vol 12 No 3 (2016)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (329.348 KB) | DOI: 10.14692/jfi.12.3.96

Abstract

Late blight disease on potato caused by a plant pathogenic fungus (Phytophthora infestans)  is the most important disease in Indonesia.  The use of antagonist fungi Trichoderma is an environmentally friendly technology to control the potato disease. The purpose of this study was to determine the ability of Trichoderma spp. to control P. infestans in vitro. Trichoderma spp. have been isolated from suppressive soil at central potato areas in district of Lembang, Bandung, West Java Province. To determine the inhibition ability of Trichoderma spp against P. infestans, a dual culture method was performed.  Variable observed was inhibition zone of Trichoderma spp. against P. infestans. The results showed that 9 isolates of Trichoderma were successfuly isolated from suppressive soil, i.e. T. viride (2 isolates), T. atroviride (1 isolate), T. harzianum (1 isolate) and T. aureoviride (5 isolates). All the Trichoderma isolates revealed growth inhibition abality against P. infestans and. The highest growth inhibition (68.6%) was observed by T. viride isolate ( Ti 9).
PENYAKIT BUSUK AKAR DAN PANGKAL BATANG TEBU DI SUMATERA SELATAN Maryono, Tri; Widiastuti, Ani; Priyatmojo, Achmadi
Jurnal Fitopatologi Indonesia Vol 13 No 2 (2017)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (604.321 KB) | DOI: 10.14692/jfi.13.2.67–71

Abstract

Root and basal stem rot disease caused by Xylaria sp. is a new diseases in Indonesian sugarcane plantation. The disease has been reported only occurred in sugarcane plantations in Sumatera. Limited information about the disease has slowed down disease diagnosis in the field. The research was aimed to describe symptoms, signs, and spatial distribution of the disease caused by Xylaria. A survey was conducted at a sugarcane plantation in South Sumatera (3° 26? 16.6? S dan 104°40? 09.8? E). Typical symptoms of the disease involved drying of all leaves and plant death, dry rot of root and basal stem, and retarded growth of ratoon cane were recorded. Stroma was found on surface of diseased stems and on soil surface of diseased plants, and spatial aggregation of diseased plants was observed in all locations. The distribution of the diseased plant aggregately and the presence of stroma on diseased plants are important characteristics of the disease diagnosis in sugarcane plantations.
IDENTIFIKASI CENDAWAN PENYEBAB PENYAKIT PASCAPANEN PADA BEBERAPA BUAH DI YOGYAKARTA Widiastuti, Ani; Ningtyas, Ovianne Hapsari; Priyatmojo, Achmadi
Jurnal Fitopatologi Indonesia Vol 11 No 3 (2015)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (655.361 KB) | DOI: 10.14692/jfi.11.3.91

Abstract

In Indonesia, high yield losses due to post-harvest diseases are often difficult to measure because research focusing on such matter are still limited. This study aimed to determine the genera of fungi that cause rot on postharvest fruit, which can be used as a basis to determine the important pathogens in the current post-harvest commodities and for further disease management. The method used is sample collection, single spore isolation, microscopic observation and identification of fungal genera. Colletotrichum sp. was sucessfuly isolated from antrachnose of papaya. Pestalotia sp. was found in the fruit rot of avocado and star fruit. Lasiodiplodia sp. was found in mango, while Pestalotia sp. and Lasiodiplodia sp. was found in both sapodilla and banana. Alternaria sp. was found in the fruit rot of pears and apples. Aspergillus sp. was found in grapes, and Fusarium sp. was isolated from pineapple fruit rot.
UJI PENGGABUNGAN PGPF DAN Pseudomonas putida STRAIN PF-20 DALAM PENGENDALIAN HAYATI PENYAKIT BUSUK LUNAK LIDAH BUAYA DI TANAH GAMBUT Supriyanto, .; Priyatmojo, Achmadi; Arwiyanto, Triwidodo
JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA Vol 11, No 1 (2011): Maret, Jurnal Hama dan Penyakit Tumbuhan Tropika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (88.657 KB) | DOI: 10.23960/j.hptt.11111-21

Abstract

Aloe (Aloe vera L. Webb) planted in West Borneo peat land is well known to have the best product quality in Indonesia. Bacterial soft rot is one of the constraints on aloe cultivation on peat land.  Many methods have not given significant result for controlling this disease.  The research objectives were to study the application of PGPF and its combination with Pseudomonas putida Pf-20 for controlling aloe bacterial soft rot on peat land.  In vitro test showed that two isolates of PGPF tested had different respons when combining with P. putida Pf-20.  The bacterial P. putida Pf-20 inhibit the growth of PGPF SNTH003 (Aspergillus sp.) as 20.14% on King’s B and 7.48% on PDA, whereas SNTH001 (Penicillium sp.) as 62.4% on King’s B dan 34.39% on PDA.  Glass house trial showed that root dipping in P. putida Pf-20 suspension could not promote the growth of aloe, but could reduce the disease intensity.  The single application of SNTH001 and SNTH003 isolates were able to increase the growth of aloe compare with its combination each of PGPF isolates with P. putida Pf-20.  Single application of SNTH003, SNTH001 and P. putida Pf-20 was able to reduce the disease intensity of bacterial soft rot, but the capability decreased when each of PGPF combined with P. putida Pf-20.  However combination between SNTH003 and P. putida Pf-20 increased that disease intensity. The lowest disease intensty (25%) obtained by using  SNTH001 isolate.
Intensitas Cemaran Jamur pada Biji Jagung Pakan Ternak Selama Periode Penyimpanan Puspitasari, Destania Putri Indah; Widiastuti, Ani; Wibowo, Arif; Priyatmojo, Achmadi
Jurnal Perlindungan Tanaman Indonesia Vol 19, No 1 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (113.021 KB) | DOI: 10.22146/jpti.16066

Abstract

This research aimed to know the intensity of fungal contamination in maize grain cattle-feed during storage. Five kilogram of grain sample were collected from Klaten, Sleman, and Muntilan, then stored at CV. Ragil Jaya’s warehouse for two months. Every two weeks the water content were measured and the grain were tested using PDA and blotter methods. Incubation during isolation process were conducted for seven days at 12 hour darkness and 12 hour light. Results showed that dominant fungal contamination from Klaten, Sleman, and Muntilan wasAspergillus sp. As2 isolate with contamination intensity as much as 89% (blotter), 73% (PDA), and 44% (blotter). The results also showed that factors which influenced the intensity of fungal contamination in cattle-feed maize is the grain condition before storage such as broken grain, dirt, and insect; and not caused by the planting location.  INTISARIPenelitian ini bertujuan untuk mengetahui intensitas cemaran jamur dominan pada biji jagung yang digunakan sebagai pakan ternak selama penyimpanan. Biji jagung pakan ternak dari Klaten, Sleman, dan Muntilan sebanyak 5 kg disimpan di gudang CV. Ragil Jaya, Magelang selama 2 bulan. Pengukuran kadar air dilakukan setiap 2 minggu dan kemudian diuji dengan metode PDA dan blotter untuk mengetahui cemaran jamur pada biji jagung. Hasil penelitian ini menunjukkan bahwa dari sampel biji jagung pakan ternak yang berasal dari Klaten, Sleman, dan Muntilan, jamur cemaran yang mendominasi, yaitu Aspergillus sp. isolat As2 dengan intensitas cemaran jamur tertinggi di daerah Klaten 89% (blotter), Sleman 73% (PDA), dan Muntilan 44% (blotter). Hasil ini menunjukkan bahwa hal yang mempengaruhi intensitas cemaran jamur pada jagung pakan ternak adalah kondisi awal bahan yang disimpan yaitu ada tidaknya kerusakan, kotoran, dan serangga; bukan lokasi penanaman jagung.