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First Reports on Fungal Pathogens of Improved Jujube in Bangladesh

M. Z. Hoque
Senior Scientific Officer
Senior Scientific Officer, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur-1701.

M. A. Mannan Akanda
Professor
Professor, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh.

I. H. Mian
Professor
Professor, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh.

M. K. A. Bhuiyan
Professor
Professor, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh.

Abstract/ Executive Summary:

A survey was conducted in Bangladesh to identify the fungal diseases of jujube and their causal path-ogens occur in commercial orchards, planted with high yield varieties. The identified diseases and their causal fungi were leaf spots (Alternaria alternata, Cercospora ziziphi, Curvularia lunata, Fusarium semitectum, Lasiodiplodia theobromae, Mitteriella ziziphina, Pestalotiopsis palmarum), fruit spots and pre-harvest fruit rot (A. alternata, Colletotrichum gloeosporioides, C. lunata, F. se-mitectum, L. theobromae, M. ziziphina, Nigrospora oryzae, P. palmarum, Phomopsis sp.), post-harvest fruit rot (A. alternata, Aspergillus spp., C. gloeo-sporioides, C. lunata, , F. semitectum, Nigrospora oryzae, Penicillium spp., Phomopsis sp. P. pal-marum, Rhizopus sp.), powdery mildew (Oidium erysiphoidess f. sp. ziziphi), sooty mould or black mold or Isariopsis mold (Isariopsis indica var. ziziphi, Capnodium sp.) and stem bleeding or gummosis (P. palmarum, C. lunata). Among the fungal pathogens causing jujube diseases, P. pal-marum, C. gloeosporioides, A. alternata, F. se-mitectum, C. lunata, L. theobromae, C. ziziphi, Phomopsis sp., I. indica var. ziziphi, M. ziziphina and N. oryzae were noted as new records in Bang-ladesh

Keywords: Diseases, Fungal pathogen, Jujube

Location: Gazipur, Pabna, Rajshahi, Rangpur and Mymensingh

Start Date: 00-00-2007

End Date: 00-00-2010

Program Area: Pest Management

Commodity: Fungicide

Objectives:

To survey the occurrence of fungal dis-eases of jujube in Bangladesh and their causal fun-gi.

Methodology:

Commercial jujube orchards were selected in five jujube growing districts namely Gazipur, Pabna, Rajshahi, Rangpur and Mymensingh. The orchards were planted with three improved jujube varieties viz. apple Kul, BAU Kul and BARI Kul-1. A total of 405 diseased samples representing 150 fruits, 135 leaves, 30 trunks and 90 inflorescences of ju-jube were collected from the selected areas during 2007-08, 2008-09 and 2009-10. Among 150 fruit samples 73 were collected from markets of those locations. The collected samples were examined carefully and symptoms of individual diseases were recorded and photographs were taken. Fungal pathogens associated with the dis-eased samples were isolated from infected plant samples following standard tissue planting methods using potato dextrose agar (PDA) medium as de-scribed by Aneza (2003). When ever necessary, infected samples were placed in moist chambers and incubate at room (25 ±2 C) temperature for two days. Fungal mycelia grew from the samples were transferred directly to PDA plates.Fungi isolated from the collected diseased specimens were purified following single spore culture and/or hyphal tip culture method (Aneza 2003). The isolated fungi were identified based on colony and morphological characters on PDA and consulting available literature (Barnett and Hunter 1972, Sutton 1980). Pathogenicity of different fun-gal pathogens isolated from diseased samples of jujube was performed following detached leaf and detached fruit inoculation method .

Source of Information: Bangladesh J. Plant Pathol. 28(1&2):1-8.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Based on findings of the present investigation, it may be concluded that 16 fungal plant pathogens are associated with improved and high yielding varieties of jujube diseases in Bangladesh. They cause leaf spots, rust, fruit spots and fruit rot, powdery mildew, sooty mold, stem bleeding and post-harvest deterioration of the fruits. Among the fungal pathogens of jujube A. alternata, C. ziziphi, C. gloeosporioides, C. lunata, F. semitectum, I. indica var. ziziphi, L. theobromae, M. ziziphina, Nigrospora sp. and Phomopsis sp. are recorded as new pathogens of the fruit in Bangladesh.

Knowledge Management: Journal