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Abundance of Predators in Country Bean Field During Summer Season

M. M. I. Mollah
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

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

Abstract/ Executive Summary:

The study was conducted at the experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during March to July 2009 in order to know the abundance of biological control agents (predators) in country bean ecosystem. During the study period the predators, black ant (Formicidae), lady bird beetle (Coccinellidae), Stink bug (Pentatomidae), Damsel fly (Coenagrionidae) and spider was found considerably. At the vegetative stage black ant (Formicidae) was highly abundant followed by lady bird beetle and spider. At the reproductive stage lady bird beetle, black ant and pentatomid bug found abundantly.

Keywords: Predaceous insects, Spider, Abundance

Location: Experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Start Date: 00-03-2009

End Date: 00-07-2009

Program Area: Pest Management

Commodity: Country bean

Objectives:

The present study was undertaken to know the abundance of predaceous insects and spiders on country bean during summer season with a view to conserve and augment them to facilitate the biological control of insect pests.

Methodology:

The study on the abundance of predaceous insects & spiders in country bean field was conducted at the Research field of Entomology Department in Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during the period from March to July 2009. Monitoring the incidence of predaceous insects & spiders at vegetative stage - For the purpose of studying the incidence of predaceous insects and spider, a close monitoring of field was done at every alternate day. Data collection at morning and afternoon was not conducted at the same date. The incidence of natural enemies and pests was observed through visual search and sweep net wherever whichever was suitable in all plots and their number was noted. The specimens were brought to the laboratory for description and identification. For identification and confirmation some species were reared in the laboratory. Monitoring the incidence of predaceous insects and spider at reproductive stage - For the purpose of studying the incidence of predaceous insects and spider at early reproductive stage. All plants in the plot were closely observed by visual search and sweep net at five days interval. Sometimes sweep net was used to capture the flying predaceous insects. Their number was recorded for calculating relative abundance. A total number of seven observations were conducted during this period.
Data collection
Data was collected from the experimental plots on the following parameters:
> Predaceous insect species and spider found at vegetative stage.
> Number of predaceous insects and spider at vegetative stage.
> Predaceous insect species and spider found at reproductive stage.
> Number of predaceous insects and spider at reproductive stage.
> Relative abundance.
The collected data were properly analyzed by using Microsoft excel software for proper interpretation. Relative abundance (%) = (Number of specific insects/Total number of insects) x 100.

Source of Information: International Journal of Biosciences (IJB); ISSN: 2220-6655 (Print) 2222-5234 (Online); Vol. 2, No. 9, p. 65-70, 2012

Article Link (Online Journal): http://www.innspub.net

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The prevalence of predators in morning was same to afternoon but their abundance was different. Among the predators black ant found highly abundant (83.99 %) which was followed by spider (6.69 %), lady bird beetle (5.59 %), damsel fly (2.00 %) and the lowest abundant was stink bug (1.73 %). So, the relative abundance of predators were found in order of black ant (83.99 %) > spider (6.69 %) > lady bird beetle (5.59 %) > damsel fly (2.00 %) > stink bug (1.73 %).

Knowledge Management: Journal