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Influence of Topography, Plant Age and Shading on Red Rust (cephaleuros Parasiticus Karst.) Disease of Tea in Sylhet Region

R Hasan
Department of Plant Pathology & Seed Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

M H Rahman
Department of Plant Pathology & Seed Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

A Hussain
Department of Plant Pathology & Seed Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

A Muqit*
Department of Plant Pathology & Seed Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

A Hossain
Department of Plant Pathology & Seed Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

M Ali
Plant Pathology Division, Bangladesh Tea Research Institute, Srimangal-3210, Moulvibazar, Bangladesh

M S Islam
Plant Pathology Division, Bangladesh Tea Research Institute, Srimangal-3210, Moulvibazar, Bangladesh

Abstract/ Executive Summary:

A survey was conducted in different tea estates of greater Sylhet region and Bangladesh Tea Research Institute during April to July 2013 to assess the relationship of red rust disease of tea with topography (Tillah, hillock and flat) of the estates, plant age and shading conditions. A wide variation in disease incidence and severity was found among various tea estates. Disease incidence and severity were significantly higher in flat areas compared to hillock and tillah areas. Tea plants of tillah, hillock and flat areas were found 49, 59 and 70% disease affected, respectively. Mature plants had more disease incidence compared to younger plants. Shading conditions showed significant impact on disease reaction. Less amount of disease was observed in shaded areas as compared unshaded ones.

Keywords: Red rust, Tea, Topography, Shade, Plant age

Location: Different tea estates of greater Sylhet region and Bangladesh Tea Research Institute

Start Date: 00-04-2013

End Date: 00-07-2013

Program Area: Pest Management

Commodity: Tea, Diseases

Objectives:

The present study was conducted to know and evaluate the influence of topography, plant age and shading conditions on red rust disease incidence of tea plants in Sylhet region.

Methodology:

The survey was conducted in nine different tea estates namely Lackatoorah tea estate, Malnicherra tea estate and Burjan tea estate adjacent to Sylhet town, Ghazipore tea estate, Marina tea estate and Bejoya tea estate in Kulaura upazila of Moulvibazar district, Moomincherra tea estate in Fenchuganj upzila, Chundeeche tea estate in Luskerpore upazila of Habiganj district, Baraoora teaestate in Srimangal upazila and Bangladesh Tea Research Institute (BTRI) in Srimangal, Moulvibazar during April to July 2013. The landscape of a particular tea garden was divided into ‘Tillah’, ‘Hillock’ and ‘Flat’ area. Tillah was defined as a land form that extended above the terrain; hillock meant slope area and flat was defined as the plain land form. Plants were categorized as ‘young’ (0-5 years) and ‘mature’(>5 years). The area under shade tree was considered as ‘Shade’. From each location three samples were selected randomly and for each sample 50 bushes were selected for data collection. Disease was scored on a 0 to 5 scale (0 = no infection, 1 = 1 to 20%, 2 = 21 to 40%, 3 = 41 to 60%, 4 = 61 to 80% and 5 = 81-100% infected plants) (Islam and Ali, 2011). Disease incidence and percent disease index (PDI) was calculated according to the formula. Statistical analysis was done by MSTAT-C.

Source of Information: J. Sylhet Agril. Univ. 1(2):227-230, 2014 ISSN: 2308-1597

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results obtained from the present study in different tea states revealed that red rust incidence was greatly influenced by the topography and shading conditions. In tillah and shaded area disease incidence was significantly lower as compared to flat and unshaded areas. Mature plants had more disease infestation than younger plants, although the difference was not significant in most of the cases. A wide variation in disease incidence and severity of red rust across different tea estates indicated that other factors like location, variety, growing conditions and management practices might play significant role in the development of red rust disease. More studies covering those aspects could give better explanation and clear insight about red rust in tea plants.

Knowledge Management: Journal