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Effect of Geographical Variations on Jackfruit Trunk Borer Infestation in Three Selected Districts of the Country

K. U. AHMED
Tuber Crops Research Centre, Bangladesh Agricultural Research Institute, Gazipur

M. M. RAHMAN
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

M. Z. ALAM
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. M. HOSSAIN
Department of Horticulture

M. G. MIAH
Department of Agroforestry and Environment, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Abstract/ Executive Summary:

The geographical influence on the incidence of trunk borer was studied in terms of infestation level in jackfruit orchards under Gazipur (Kapasia Upazilla), Gaibandha (Palashbari and Sadullapur Upazilla) and Khagrachhari (Ramgarh Upazilla) districts of Bangladesh. The infestation by trunk borer on jackfruit tree
varied significantly (P<0.05) among three different regions. Trunk borer infestations were consistently the highest (37.78 %) in Gazipur, followed by Khagrachari (24.44 %) while it was the lowest (18.89 %) in Gaibandha. As per the farmers' opinion of Gazipur, Gaibandha and Khagrachari districts, severe attack by the trunk borer was first noticed in the year 2001, 2003 and 2002, respectively. Primary stage infestation (PSI) and old stage infestation (OSI) was the highest in Gazipur (14.44 %, 10.00%) followed by Khagrachari (12.22 %, 7.78%) while it was the lowest in Gaibandha (8.89 %, 4.44%). On the other hand, middle stage infestation (MSI) was the highest in Gazipur (13.33%), followed by Gaibandha (5.56 %) while it was the lowest in Khagrachari (4.44 %). The yield
performance of jackfruit trees was the highest (15.00 tons/ha) in Gazipur, followed by Khagrachari (12.66 tons/ha) while it was the lowest in Gaibandha (6.33 tons/ha).

Keywords: Geographic variation, Jackfruit trunk borer, Incidence, Geographical variation

Location: Gazipur (Kapasia Upazilla), Gaibandha (Palashbari and Sadullapur Upazilla) and Khagrachhari

Start Date: 00-00-2009

End Date: 00-00-2010

Program Area: Pest Management

Commodity: Insects, Jackfruit

Objectives:

To compare the incidence and intensity of infestation of trunk borer on jackfruit trees in three selected districts of the country

Methodology:

The geographical influence on jackfruit trunk borer was studied in terms of its incidence of infestation in jackfruit orchard under farmers' management practices
in three selected districts of different agroecological zones (AEZ) of Bangladesh, namely Gazipur (AEZ-28: Madhupur Tract, Red-brown terrace soil), Gaibandha (AEZ-25: Level Barind Tract, Grey flood plain soils and Noncalcareous brown flood plain soil, Gray terrace soil) and Khagrachhari (AEZ-29: Northern and Eastern Hills, Brown hill soils) during 2009-2010. In each district, data were recorded from three villages and in each village thirty jackfruit trees were randomly selected from an orchard. Thus a total of ninety sample trees were studied in each district. Data were collected from three villages viz., Charbaria, Nakachini and Jamirar char under Kapasia Upazilla of Gazipur, three villages viz., Katuli and Andua under Palashbari Upazilla and Arajisatargacha under Sadullapur Upazilla in Gaibandha and the three villages viz., Bairagi tila, Master para and Taichalapara under Ramgarh upazilla in Khagrachhari district. Data were recorded on first notice of infestation, per cent infestation, yield, soil characteristics and weather data such as temperature, rainfall and relative humidity. All weather data and information of soil characteristics were collected from the respective Upazilla Agriculture Office. Collected data were summarized and scrutinized carefully for statistical analysis using SPSS 13 and MSTAT-C software.

Source of Information: Bangladesh j. entomol. (2013) 23(2), 1-11

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The geographical distribution of jackfruit trunk borer in terms of infestation determined by percentage of the tree infestation during 2009- 2010 at three selected districts of Bangladesh was found significant (p < 0.05). The rate of infestation was significantly highest in Gazipur (37.78 %) and the lowest in Gaibandha (18.89 %) which was statistically similar with Khagrachari (24.44 %). The trunk borer infestation was first noticed by farmers of Gazipur in 2001 and in Gaibandha and Khagrachari in 2003 and 2002, respectively. The infestation was categorized into three stages in terms of age of infestation and damage severity among the infested jackfruit trees of different districts. The highest primary stage infestation (PSI) and old stage infestation (OSI) were observed in case of infested trees in Gazipur (14.44%, 10.00%), followed by Khagrachari (12.22%, 7.78%) while it was the lowest (8.89%, 4.44%) in Gaibandha. On the other hand, middle stage infestation (MSI) was the highest in Gazipur (13.33%) followed by Gaibandha (5.56%) and Khagrachari (4.44%). From the above results, it may be inferred that in all cases the rate of infestation of all stages was much higher in Gazipur district as compared to Gaibandha and Khagrachari. It may be due to geographical suitability for the pest supporting favourable host pest interaction. Because characteristic of Gazipur district particularly the study area, which is situated within and around the forest ecosystem which is very important in respect of jackfruit based agroforestry. The yield of jackfruit trees of three districts showed significant (P < 0.05) variation. Mean fruit numbers from healthy tree were the highest (16 fruits/tree, 15.00 tons/ha) in Gazipur, which was statistically similar with Khagrachari (14.67 fruits/tree, 12.66 tons/ha). The lowest yield was found in Gaibandha (8.00 fruits/tree, 6.33 tons/ha). The yield of infested jackfruit trees varied from 2.67 to 4.00 fruits/tree and was non significant.

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