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Survey and Monitoring of Disease Occurrence and Their Intensity at Bef

Dr. Mainul Huq
Chief Scientific Officer
Department of Pest Management, BTRI, Srimangal, Moulvibazar

Dr. Mohammad Ali
Principal Scientific Officer
Plant Pathology Division, BTRI, Srimangal, Moulvibazar

Abstract/ Executive Summary:

An experiment was carried out to determine prevalence and severity of different diseases in tea in respect of topography, season and varieties at BEF. Black rot, Gall and Thread blight were found to be more in flat area with 10.60, 4.48 and 2.35% infection respectively. Horse hair blight (33.01%), Branch canker (24.44%) and Thread blight (2.79%) were more on seedlings followed by clone TV1. The lowest infestation was observed with clone BT1. Red rust disease was recorded from March to May and maximum infestation (9.48%) was found in the month of May.

Keywords: Topography, Occurrence, Infestation

Location: Bilashcherra Experimental Farm

Start Date: 01-01-1998

End Date: 31-12-2005

Program Area: Pest Management

Commodity: Diseases

Objectives:

To determine prevalence and severity of different diseases in tea in respect of topography, season and varieties.

Methodology:

Survey and scoring method.

Source of Information: Biennial Report 2005-2006

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Influence of Topography: A total of six diseases like Red rust, Branch canker, Horse hair blight, Thread blight, Gall and Black rot were recorded. Among the mentioned diseases, the average infestation of Horse hair blight was found to be more (23.38%) followed by Branch canker (19.30%). The lowest incidence was recorded with Thread blight (1.88%). It was observed that except Thread blight, Gall and Black rot diseases, all other diseases were found to be more in Tillah area. Black rot, Gall and Thread blight were found to be more in flat area with 10.60, 4.48 and 2.35% infection respectively. Plant varieties: Survey was also conducted on plant varieties to find out the genetic response on disease incidence. Tabulated data showed that, the infestation of Horse hair blight (33.01%), Branch canker (24.44%) and Thread blight (2.79%) were more on seedlings followed by clone TV1 and the lowest infestation was observed with clone BT1. Among the seedlings and, tested clones, BT1 was found to be more prone to Red rust (6.15%). The highest incidence of Black rot was noticed only on seedlings (15.24%). In case of Gall disease, it was found only on BT1 and it was recorded 12.95-100%. Seasonal influences: Month wise disease incidence was recorded to find out the climatic variations on disease intensity. A monthly survey was carried out at BEF. Results showed that Red rust disease was recorded from March to May and maximum infestation (9.48%) was found in the month of May. Highest infestation of Branch canker was observed in between September to November. In case of Horse hair blight, an increasing trend was observed from January to March. On the contrary, a decline trend with that of was observed from the month of October. Thread blight was found to be highest in between the months of January to May. The highest incidence of Gall and Black rot were recorded from September to November. During the reporting year, the maximum average incidence was found with the Horse hair blight (23.47%) followed by Branch canker (19.30%).

Knowledge Management: Report/Proceedings