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Susceptibility of Three Biocontrol Agents of Brinjal Insect Pests to Seven Selected Insecticides

A. Awal
Upazilla Agriculture Officer, DAE, Arihazar, Narayanganj, Bangladesh

M. M. Rahman
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

M. Z. Alam
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

M. M. H. Khan*
Department of Entomology, Patuakhali Science and Technology University Dumki, Patuakhali, Bangladesh

Abstract/ Executive Summary:

Susceptibility of three biological control agents of Brinjal insect pests to seven selected insecticides were evaluated. Lowest mortality (6.67%) of Camponotus compressus was found in Bactoil and Nimbicidene 0.03 EC treated brinjal and the highest mortality (100%) was recorded from Necstar-50 EC and Booster-10 EC treatments. The lowest mortality of Micraspis crocera Muls was recorded from Bactoil (3.67%) treatment while the highest mortality of Micraspis crocera Muls was found in Necstar-50 EC (100.00%) and Booster-10 EC (100.00%) treated brinjal. In case of Trathala emergence from infested shoot, the highest percentage (22.22%) was observed in the untreated control plots and lowest emergence was in Necstar-50 EC (2.22%) and Proclaim-5 SG (3.33%) treated brinjal shoots. In case of the infested fruit specimen, the highest (22.22%). Trathala emergence was found in the untreated control plots followed by the plots treated with Bactoil (18.89 %) and Nimbicidene 0.03 EC (17.78 %) while the lowest was in Necstar-50 EC (1.11%) and Booster-10 EC (2.22 %) treated brinjal fruits. Compatibility factor was highest for Bactoil (13.94, 25.33 and 27.92 with C. compressus, M. crocera and Trathala, respectively) and was lowest for Booster-10 EC (0.86, 0.86 and 4.30 with C. compressus, M. crocera and Trathala, respectively). Therefore Bactoil, Nimbicidene 0.03 EC and Tracer-45 SC were found to be the most compatible insecticides for controlling the Brinjal shoot and fruit boruss.

Keywords: Brinjal, Biological control agents, Insecticides, Compatibility, Insect pest

Location: Insecticide Toxicology Laboratory of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur

Start Date: 00-06-2009

End Date: 00-09-2009

Program Area: Pest Management

Commodity: Insecticide, Brinjal

Objectives:

The present study was undertaken to know the mortality rates of biological control agents of brinjal insect pest by exposing them to insecticides under laboratory condition and to identify the safer ecofriendly or more compatible insecticide (s) with the biological control agents.

Methodology:

Experiment was conducted at Insecticide Toxicology Laboratory of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during June to September 2009. Seven insecticides used for the experiment were Bactoil @ 2 ml/l of water, Nimbicidene 0.03 EC @ 4 ml/l of water, Tracer-45 SC @ 0.4 ml/l of water, Helicide @ 0.50 ml/l of water, Proclaim-5 SG @ 1 g/l of water, Necstar-50 EC @ 1 ml/l of water and Booster-10 EC @ 1 ml/l of water. The tested biocontrol agents were two predators viz., black ant (Camponotus compressus) and lady bird beetle (Micraspis crocera Muls) and one parasitoid Trathala sp. Test dose were prepared by diluting a definite amount of each of the insecticides separately in water in a 200 ml volumetric flask. The predators were exposed to the insecticide doses mentioned above by spraying in a 12 cm Petri desh and were covered with a netted cloth. They were supplied with water soaked cotton ball and necessary number of aphids as food. Three replicates and a control were maintained at 30±1⁰C and 70±3% R.H. Mortality counts were made after 24 and 48 hours of exposure. Insects showed abnormal body symptoms such as body contraction, cessation of feeding and paralysis were counted as dead. Abbott’s corrections were done wherever necessary (Abbott, 1925). In case of the parasitoid (Trathala sp.) percentage parasitism was assessed by collecting data from infested shoots and fruits of treated and untreated brinjal plants and simulating the difference in emergence of the parasitoids. The percent mortality of black ant or ladybird bettle was calculated according to the following formula: % Mortality = (Number of dead/Total number) × 100. Mortality data were corrected by Abbott's (1925) formula as follows: % Corrected mortality= {(Treatment mortality - Control)/ (100-control mortality)} × 100. The percent parasitism was calculated according to Mills' (1997) formula: Percent parasitism = Number of adult parasitoid emerged/ (Number of host adult insects + Number of adult parasitoid) × 100. Compatibility factor = Percent mortality of brinjal shoot and fruit borer/ Percent mortality of C. compressus and M. crocera and Trathala.

Source of Information: Jahangirnagar University J. Biol. Sci. 6(2): 75-81, 2017 (December)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From this experiment, it can be concluded that Bactoil, Nimbicidene 0.03 EC and Tracer45 SC (Spinosad) are less toxic to biological control agents such as, C. compressus, M. crocera and Trathala. Thus on overall basis Bactoil, Nimbicidene 0.03 EC and Tracer-45 SC could be used as the most compatible pesticides for controlling BSFB.

Knowledge Management: Journal