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Abundance of Insect Pests and Beneficial Arthropod Species in Insecticides Free Brinjal Field

Dr. Abdul Awal
Upazila Agriculture Officer
DAE, Laxmichari, Khagrachari, Bangladesh

Abstract/ Executive Summary:

Two field experiments were conducted during two consecutive cropping seasons, summer (April to September 2009) and winter (November 2009 to May 2010) to study the abundance of insect pests and beneficial arthropod species in insecticides free brinjal field. Twenty six arthropod species were observed through visual search method during summer 2009 out of which 18 were insect pests species (from 14 families under 8 orders) and 8 were natural enemies (from 8 families under 6 orders). The brinjal shoot and fruit borer (Leucinodes orbonalis Guenee), jassid (Amrasca biguttula biguttula Ishida), white fly (Bemicia tabaci Gennadius), aphid (Aphis gossypii Glover), epilachna beetle (Henosepilachna vigintioctopunctata Fabricius), thrips (Thrips tabaci Lindeman), mealybug (Coccidohystrix insolitus Green) were found as common insect pests of brinjal in the field. Among the natural enemies, black ant (Camponotus compressus Fabricius), ladybird beetle (Micraspis crocea Mulsant), spiders (Lycosidae), carabid beetle (Ophionea nigrofasciata Schmidt-Gobel), Bracon sp., Trichogramma spp., and Trathala sp. were common. Twenty one species of surface dwelling arthropods were caught in pitfall trap method of which 12 were insect pest species (from 11 families under 8 orders) and 9 were natural enemies (from 9 families under 5 orders). Formicidae was the most abundant family among them.

Keywords: Abundance, Beneficial arthropods, Brinjal, Insect pest

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

Start Date: 01-04-2009

End Date: 31-05-2010

Program Area: Pest Management

Commodity: Brinjal

Objectives:

To study the abundance of insect pests and beneficial arthropod species in insecticides free brinjal field.

Methodology:

The experiment was laid out in randomized complete block design (RCBD) with three replications in the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during two consecutive seasons, summer (April to September 2009) and winter (November 2009 to May 2010). The whole field was divided into 3 blocks of equal size having space of 2 meters between blocks and 1.5 meters between plots. The unit plot size was 3m x 3m accommodating 15 pits per plot. The distance between rows was 1m and that of plants was 60 cm. The application of manures and chemical fertilizers was followed by the method described by Rashid (1993). Seeds of brinjal variety BARI brinjal-8 were collected from the Horticultural Research Center (HRC) of Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur. A small seed bed measuring 5 m x 1 m was prepared and seeds were sown in the nursery bed at Experimental field of the Department Entomology, BSMRAU, on 6 March 2009 for summer season and on 7 October 2009 for winter season. A total of 360 seedlings having 35 days old were planted in 24 plots @ 15 seedlings per plot with spacing row to row 1.00 m and seedling to seedling 60 cm. Weeding in the plots was done whenever necessary.

Data collection The counting of individual was performed by using visual search, sweep net and pitfall trap. The normal seasonal fluctuations and the population dynamics of arthropods were recorded from pesticides free plots of brinjal. The samples were labeled and stored until sorting, counting and finally were identified. Traps were set at 15 days intervals throughout the cropping season and insects and beneficial arthropods were collected and counted separately from each plot. The individuals of each sample were counted by family.

Source of Information: J. Patuakhali Sci. and Tech. Univ. 2013, 4(1): 129-136

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Information obtained from this study would be very helpful to design an integrated pest management program against BSFB of brinjal crop.

Knowledge Management: Journal