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All Journal Jurnal Perlindungan Tanaman Indonesia
Suryanti Suryanti
Department of Plant Protection, Faculty of Agriculture, Universitas Gadjah Mada Jln. Flora No. 1, Bulaksumur, Sleman, Yogyakarta 55281
Agriculture, Biological Sciences & Forestry

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Fungal Pathogens Associated with Vascular Streak Dieback (VSD) Disease on Cacao in Special Region of Yogyakarta Province Hendra Hendra; Arif Wibowo; Suryanti Suryanti
Jurnal Perlindungan Tanaman Indonesia Vol 23, No 1 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.41512

Abstract

Cacao is one of the pre-eminent crops plantation with high economic value. Indonesia's cacao beans production is the third largest in the world after Ivory Coast and Ghana. Vascular Streak Dieback (VSD) is one of the important diseases of cacao which caused a decreased yield either in quantity or quality. The disease is caused by the basidiomycete fungus Ceratobasidium theobromae (syn. Oncobasidium theobromae). Spores are carried by wind to spread, infect young leaves and penetrate through natural openings and colonize xylem vessel which could inhibit the transportation system in the plant tissue. There are several fungal pathogens associated with VSD diseases on cacao. This research aimed to study the fungi associate with VSD diseases on cacao in Special Region of Yogyakarta Province. Survey and sampling were conducted in cacao plantations in regencies of Gunungkidul, Kulon Progo, Bantul and Sleman. The severity of VSD disease in the regencies of Gunungkidul and Kulon Progo were high, while in the regencies of Sleman and Bantul were moderate. Eighty eight fungal isolates were isolated from infected petiole and stem. The in vitro pathogenicity test screened 32 fungal isolates causing necrotic and chlorotic symptoms on young healthy cacao leaves with and without wounding. The first symptoms appeared at 8-12 days after inoculation and fungal mycelium could grow at 1−3 days after inoculation. Those isolates collected showed a high diversity of colony morphology. Lasiodiplodia sp., Fusarium sp., Colletotrichum sp., and Pestalotiopsis sp. had been identified based on conidial morphology.
Inhibition of Rehmannia mosaic virus Infection by Ganoderma sp. Extract Mustika Ajeng Kartini Putri Pertiwi; Suryanti Suryanti; Susamto Somowiyarjo
Jurnal Perlindungan Tanaman Indonesia Vol 24, No 2 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.49592

Abstract

In fruiting bodies and mycelia of several fungi belonging to a Basidiomycetes group, among others, Ganoderma contains active polysaccharides and has potential as an antiviral substances. This study aimed to determine the effect of mycelium and fruiting body extract of Ganoderma sp. against Rehmannia mosaic virus (ReMV) infections on Chenopodium amaranticolor with variations of dilution and application times. The results showed that mycelium and fruiting body extract of  Ganoderma sp. could inhibit ReMV infections. Antiviral extract which were applied 4 hours before, and at the same time with virus inoculation resulted in a higher viral inhibition rates than when applied 4 hours after virus inoculation. Fruiting body extract at 10-1 and 10-2 dilutions delayed symptom appearance caused by ReMV infection when applied 4 hours before virus inoculation. Mycelium extract at dilution of 10-2 and 10-3 applied 4 hours before virus inoculation resulted in the highest inhibition rate (100%) which was indicated as the number of local lesions on Chenopodium amaranticolor leaves. Meanwhile the fruiting body extract dilution of 10-1 resulted in highest inhibition (99.55%) when applied 4 hours before virus inoculation.
Co-Authors Arif Wibowo Hendra Hendra Mustika Ajeng Kartini Putri Pertiwi Susamto Somowiyarjo