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Relationship of Mango Seedling Diseases Prevalence to the Environmental Factors

M.N. Islam
Department of Plant Pathology, Sher - e - Bangla Agricultural University, Dhaka - 1207, Bangladesh

K.K. Poddar
Department of Agricultural Extension and Information System, Sher - e - Bangla Agricultural University, Dhaka - 1207, Bangladesh

AFM Jamal Uddin
Department of Horticulture, Sher - e - Bangla Agricultural University, Dhaka - 1207, Bangladesh

Ismail Hossain
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh, Bangladesh

Abstract/ Executive Summary:

Anthracnose, leaf spot and sooty mold of mango were studied to see their relation with temperature, relative humidity and rainfall. A positive correlation was observed between prevalence of anthracnose and leaf spot with temperature and relative humidity. Maximum prevalence of anthracnose and leaf spot was observed in October and minimum in January. Relative humidity showed a positive correlation with prevalence of leaf spot and prevalence of sooty mould of mango. The prevalence of leaf spot and sooty mould was in October and no prevalence observed in January. Thus leaf spot is being reported as a new disease of mango seedlings in Bangladesh.

Keywords: Anthracnose, Leaf spot, Sooty mold, Temperature, Relative humidity, Rainfall.

Location: Eght nurseries of Dhaka (Green orchid nursery, Agargaon and Barisal nursery, Savar), Gazipur (Gazipur nursery and Laxmipur nursery)

Start Date: 00-07-2010

End Date: 00-04-2012

Program Area: Pest Management

Commodity: Mango

Objectives:

To study the seedling diseases of mango

Methodology:

The experiment was carried out in eight nurseries of Dhaka (Green orchid nursery, Agargaon and Barisal nursery, Savar), Gazipur (Gazipur nursery and Laxmipur nursery), Barisal (Sarchina nursery and Riyad nursery) and Khagrachari (Hill Research Center, Khagrachari and Ramghar nursery, Ramghar) during July 2010 to April 2012 to study the seedling diseases of mango. Altogether eight surveys were made in July 2010; October 2010; January 2011; April 2011; July 2011; October 2011; January 2012; April 2012; respectively. 30 randomly sleeted 2 years mango seedlings for counting diseased leaves and disease free leaves and moreover five leaves/plant were randomly selected to determine the disease severity. Disease incidence and disease severity were determined. Disease incidence (%) = (No. of diseased leaves ÷ No. of total leaves) × 100 Disease severity (%) = (Area of leaf tissue infected ÷ Total leaf area) × 100 Meteorological data of the experimental period were collected from Meteorological Department, Agargaon, Dhaka, Bangladesh.

Source of Information: Sci. Agri. 10 (3), 2015: 137-144

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The occurrence of seedling disease in nursery revealed that all diseases studied are related to the temperature, relative humidity and rainfall. Other parameters of epidemiology viz. leaf wetness period, vapor presser deficit, sunshine hour and microclimate should be critically evaluated. Formation, germination and development of inoculums in different patho-system should also be critically studied for each host-pathogen system to find out the most appropriate time to combat the disease at minimum effort.

Knowledge Management: Journal