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Abundance and Incidence of Pollinator Visitors on Different Cotton Varieties

H.M.S. Azad
Regional Cotton Research Station, Dinajpur, Bangladesh

M.R. Amin
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

S.M.A. Hossain
Regional Cotton Research Station, Dinajpur, Bangladesh

D.A. Tithi
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Abstract/ Executive Summary:

Abundance and incidence of pollinator visitors on cotton varieties CB9, CB10 and SR05 were studied under threshold sprayed of chemical insecticides and non-sprayed conditions at Regional Cotton Research Station, Dinajpur, Bangladesh. The pollinator visitors on different cotton varieties constituted 12 species of which 5 are in two families of Hymenoptera, 5 are in two families of Lepidoptera and 2 in two families of Diptera. The major pollinator honeybee and bumblebee incidence were statistically similar on the studied cotton varieties both in threshold sprayed and non-sprayed condition.

Keywords: Abundance, Incidence, Cotton, Pollinator, Variety

Location: Regional Cotton Research Station, Dinajpur, Bangladesh

Start Date: 00-08-2008

End Date: 00-11-2008

Program Area: Variety and Species

Commodity: Cotton

Objectives:

1. To know the present status of insect pollinators associated with three cotton varieties.

Methodology:

The experiment was conducted in the Regional Cotton Research Station, Dinajpur, Bangladesh during August to November, 2008. The land was prepared at field condition by deep ploughing and harrowing followed by laddering. The field layout was done after final land preparation and the experiment was conducted in randomized complete block design. The plot size was 5.4 m x 5.0 m and the spacing between block to block and plot to plot was 1.5 and 1.0 m respectively. Seeds of CB9, CB10 and SR05 varieties were sown in rows on 3rd August with a spacing 45 cm from plant to plant and 90 cm from row to row. Each variety was cultivated following ETL based insecticide sprayed and non-sprayed conditions following three replications. Intercultural operations such as mulching, weeding and irrigation etc were done whenever necessary and fertilizers were applied according to the recommemded doses of Cotton Development Board of Bangladesh. In the ETL based plots, Decis 2.5 EC, Ripcord 10 EC and Relothrin 25 EC were sprayed following their recommanded doses for controlling chewing insects. Whereas Asataf 75 SP, Imitaf 20 SL and Actara 25 WG were applied for controlling sucking pests. Pollinator abundance was recorded by weekly observation of the plots. Incidence of the major pollinators was estimated by weekly scouting. In each scouting 5 plants were randomly selected from each replication. Plants were examined for honey bee and bumblebee. A scouting form was used during estimation of the incidence. Data of the major pollinator incidence were analyzed by analysis of variance (ANOVA) and the mean values were separated by Duncan’s Multiple Range Test (DMRT).

Source of Information: J. Agrofor. Environ. 4 (1): 75-76, 2010; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

This study showed that only hover fly and house fly were the most common Diptarans in the cotton field. Hoverflies are vital pollinator of crops were found in this study. Results of this study showed that cultivated varieties did not affect the incidence of pollinators both in ETL based insecticide sprayed and non-sprayed conditions. However, the incidence was lower in ETL based insecticide sprayed field compared to non-sprayed field, and the species abundance was alarming compared to world perspective.

Knowledge Management: Journal