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Survey and Monitoring of Arthropod Diversity in Organically Grown Brinjal and Sweetgourd

M. S. Hossain
Senior Scientific Officer
Entomology Section, HRC, BARI, Gazipur

M. N. Uddin
Scientific Officer
Olericulture Division, HRC, BARI. Gazipur

A.K.M. Khorseduzzaman
Senior Scientific Officer
Entomology Section, HRC, BARI, Gazipur

Abstract/ Executive Summary:

A study on arthropods diversity in brinjal and sweet gourd agro-ecosystem grown in the organic block was conducted at the Olericulture division of Horticulture Research Center, BARI, Gazipur in rabi season during November 2009 to March 2010. Sixteen species of harmful arthropods under 14 families were observed belonging to 5 different orders both in organic and conventional practiced brinjal field. Aphid (Aphis gossypii), jassid (Amrasca biguttula biguttula), white fly (Bemicia tabaci), brinjal shoot and fruit borer (Leucinodes orbonalis) and epilachna beetle (Epilachna sp.) were found as the most common insect pests. On the other hand 15 different species of harmful arthropods of 14 families under 6 orders were observed in sweet gourd field. Total 10 species of natural enemies were found in brinjal field while 11 species were found in sweet gourd organic field but only 4 species and 5 species were present in conventional practiced field. Diversity index and equitability of insect pests were more in organic field than conventional practiced plots. The abundance and diversity of natural enemies in organic plots were several folds more than conventional practiced plots.

Keywords: Arthropod diversity, Brinjal, Sweet gourd

Location: Olericulture division of Horticulture Research Center, BARI, Gazipur

Start Date: 01-11-2009

End Date: 31-03-2010

Program Area: Pest Management

Commodity: Sweet gourd, Sweet gourd

Objectives:

To find out arthropods biodiversity including the natural enemies for judging their status and suitability in the organic farming system.

Methodology:

A study was conducted in an organic block under Olericulture division of Horticulture Research Center, BARI, Gazipur in rabi season during the period from November 2009 to March 2010 following randomized completely block design (RCBD) with four replications. Two treatments viz., 1. Organic practice where no chemicals were used, and 2. Conventional practice, where chemical fertilizers and pesticides were used. Though number of species was the simplest measure of species diversity, but due to limitation of species identification, concept was restricted to order and family level. The counting of individuals was performed by using one absolute method viz., visual searching and two relative methods viz., pitfall trap and sweeping net. The population dynamics of arthropods were recorded from organic plots of brinjal and sweet gourd as well as from conventional practiced plots.

Source of Information: HRC Annual Report, 2009-10

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Tweenty Thousand

Total Budget (Tk.) : Tweenty Thousand

Achievement/Findings:

From the study it is revealed that sixteen species of harmful arthropods under 14 families were observed belonging to 5 different orders both in organic and conventional practiced brinjal field. Aphid (Aphis gossypii), jassid (Amrasca biguttula ), white fly (Bemicia tabaci), brinjal shoot and fruit borer (Leucinodes orbonalis) and epilachna beetle (Epilachna sp.) were found as the most common insect pests. On the other hand 15 different species of harmful arthropods of 14 families under 6 orders were observed in sweet gourd field. Total 10 species of natural enemies were found in brinjal field while 11 species were found in sweet gourd organic field but only 4 species and 5 species were present in conventional practiced field. Diversity index and equitability of insect pests were more in organic field than conventional practiced plots. The abundance and diversity of natural enemies in organic plots were several folds more than conventional practiced plots.So, organic farming may be more eco-friendly and be an alternative to conventional farming system.

Knowledge Management: Report/Proceedings