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Diversity of Insects in Okra Agro-ecosystem at Gazipur in Bangladesh

Md Ruhul Amin
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Khushi Tripura
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Md Ramiz Uddin Miah
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Emrul Kayesh
Department of Agronomy Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Md Arifur
Department of Agronomy Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Abstract/ Executive Summary:

Diversity and occurrence of insect pest, predator and pollinator associated with okra Abelmoschus esculentus L. were observed at Gazipur in Bangladesh during May to September 2016. Insects in the okra agro-ecosystem belonged to 29 species, in 24 families under 10 different taxonomic orders. The pest, predator and pollinator insect species revealed the highest occurrence in the order Hemiptera, Coleoptera and Lepidoptera, respectively. The relative abundance of the insect pest varied from 0.9 to 35.7%, predator from 1.7 to 26.0% and pollinator from 2.7 to 34.8%. Among the pests, aphid, white fly, and okra shoot and fruit borer were found as major pests. The aphid, ant and lemon butter fly depicted maximum abundance as pest, predator and pollinator, respectively.

Keywords: Abelmoschus esculentus, Insect, Pest, Predator, Pollinator

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh

Start Date: 00-05-2016

End Date: 00-09-2016

Program Area: Conservation and Biodiversity

Commodity: Insects, Okra

Objectives:

In the present study diversity and occurrence of the insect pest, predator and pollinator prevailing in okra agro-ecosystem illustrating their relative abundance was observed.

Methodology:

The study was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh during May to September 2016. The site is located at 25°25′ North latitude and 89°5′ East longitude, which is in the middle of Bangladesh. Annual mean maximum and minimum temperatures, relative humidity and rainfall in o the study area are 36.0 and 12.7 C, 65.8% and 237.6 cm, respectively. Cultivation of okra: Seeds of okra Abelmoschus esculentus variety BARI OKRA-1 were sown on 26 May 2016 in 35 × 40 m plot. The spacing from plant to plant was 40 cm and from line to line was 50 cm. Regular intercultural operations such as weeding, irrigation etc were done on the basis of need and insect pest management was not adopted. Fertilizers were applied at the rate of 90-30-60-15 kg/ha N, P, K, and S as urea, triple super phosphate (TSP), muriate of potash (MoP) and gypsum, respectively (Ahmed et al 2013). Half of urea and all other fertilizers were used as basal. Remaining urea was applied around okra plant as top dress in two equal split rd th at 3 and 5 weeks after sowing followed by irrigation. Insect collection, identification and categorization: Insects were captured using sweeping net having 30 cm diameter ring and 1.5 mm mesh, and attached with a 2 m long rod. A vacuum suction sampler was also used to capture very small insects. Insects were collected at weekly interval from seedling to last harvest of okra. Every collection date, both sweep net and vacuum suction sampling were done 30 times. The collected insects were brought from the experimental field to the Entomology Laboratory of BSMRAU and stored in a freezer for a few hours to kill, then mounted on points, dried and morphotyped. For identification, the insects were compared with the specimens in a labeled collection and compared with pictures or descriptions. The identified insects were categorized as pest, predator and pollinator and their relative abundance were calculated. Statistical analysis: Chi statistic was applied to find out significant difference in the occurrence of insect species in different taxonomic orders. All the analyses were performed using IBM SPSS 21.0 (IBM SPSS statistics 21, Georgia, USA).

Source of Information: Indian Journal of Ecology (2019) 46(1): 214-216

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study revealed that various insect species belonged to different orders were pest, predator and pollinator in the okra agro-ecosystem in Bangladesh, and their occurrence differed significantly.

Knowledge Management: Journal