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Seasonal Variation of Gall Mite Within the Leaf Gall of Bay Leaf

M. M. Hossain
Scientific Officer
Spices Research Centre (SRC), Bangladesh Agricultural Research Institute (BARI), Shibganj, Bogura, Bangladesh

K. M. Khalequzzaman
Principal Scientific Officer (Plant Pathology)
Spices Research Centre (SRC), Bangladesh Agricultural Research Institute (BARI), Shibganj, Bogura, Bangladesh

M. T. R. Mondal
Scientific Officer
BINA, Mymensingh, Bangladesh

Md. Kalim Uddin
Chief Scientific Officer
Spices Research Centre (SRC), Bangladesh Agricultural Research Institute (BARI), Shibganj, Bogura, Bangladesh

Abstract/ Executive Summary:

The field experiment was conducted at Spices Research Centre, BARI, Shibganj, Bogura, Bangladesh during May 2015 to April 2016 to study the seasonal impact on the population density of the gall mite, Aceria doctersi within the leaf galls of Cinnamomum tamala. Bay leaf line BL001 were used for the study. Galled leaves were collected monthly, through random sampling and galled leaf samples were put in polythene bags and transported to the laboratory for further observation under the stereomicroscope. The maximum number of mite per gall (78/gall) with gall size 3.0cm was recorded during the month of April then it becomes gradually decrease and the minimum number of mite per gall (10/gall) with 2.1 cm gall size was recorded during the month of December. The highest Chlorophyll Concentration Index of the leaf (64.80) was also recorded from the month of December while the lowest (41.20) Chlorophyll Concentration Index of leaf was recorded from the month of April. Mite population were positively correlated with average temperature (r=0.4475) and negatively correlated with relative humidity (r= -0.5366) and rainfall (r=-0.0685). Mite population was also positively correlated with the percentage of leaf area damage (r=0.8585**).

Keywords: Seasonal variation, Gall mite, Leaf gall, Bay leaf

Location: Spices Research Centre, BARI, Shibganj, Bogura, Bangladesh

Start Date: 01-05-2015

End Date: 30-04-2016

Program Area: Pest Management

Commodity: Bay Leaf, Diseases

Objectives:

To study the population dynamics of gall mite of the bay leaf under natural condition.

Methodology:

The study was conducted at Spices Research Centre, Shibganj, Bogura, Bangladesh (geographic coordinates 25.0167° N, 89.3167° E) during May 2015 to April 2016 to study the seasonal impact on the population density of the gall mite, A. doctersi within the leaf galls of C. tamala. Bay leaf line BL001 were used for the study. Phenological studies were carried out on galled leaf samples collected randomly from C. tamala. Galled leaves were collected monthly, through random sampling and galled leaf samples were put in polythene bags and transported to the laboratory for further observation under a stereomicroscope. Data were recorded on the number of immature and mature galls developed on the abaxial and adaxial surfaces of the leaves. The size of individual gall was measured using a vernier caliper and entire surface area of galled leaf was calculated graphically to assess the percentage of damage induced by the mite. The Minolta SPAD 502 chlorophyll meter was used for the measurement of Bay leaf color. Data on temperature, RH, and rain fall recorded in the study site were obtained from meteorological station in Bogura, 15 km away from the study site.

Source of Information: Journal of Scientific Achievements, 2 (10): 6-9; October 2017; ISSN: 2207-4236

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The highest percentage of mite damage (60.38%) and the average number of mites (78/gall) observed during the summer month, April. In November and December, found to harbor a very low number of eriophyid mite (16/gall and 14/gall, respectively). Mite population was positively correlated with average temperature while negatively correlated with average relative humidity and rainfall.

Knowledge Management: Journal