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Effect of Botanicals and Synthetic Insecticide on Okra Jassid, Amrasca Devastans

M. K. Alam
Department of Entomology, Bangladesh Agricultural University Mymensingh-2202 Bangladesh

M. Mala
Lecturer
Department of Entomology, Patuakhali Science & Technology University, Dumki, Patuakhali-8602

K. S. Islam
Professor
Department of Entomology, Bangladesh Agricultural University Mymensingh-2202 Bangladesh

M. Jahan
Department of Entomology, Bangladesh Agricultural University Mymensingh-2202 Bangladesh

Abstract/ Executive Summary:

Experiments were carried out in the Field Laboratory of Entomology, Bangladesh Agricultural University, Mymensingh, during February to May, 2008 to investigate the population abundance and to determine the efficacy of three botanical oils (Neem, Mahogani, Karanja) and one synthetic insecticide (Admire 200 SL) against Okra Jassid, Amrasca devastans. The Jassid was first noticed in early March just 7 days after germination and attacked the crop seriously. The highest mean number of Jassid leaf^-1 (34) was found in April, 2008. In evaluating the effectiveness of the insecticide and botanical oils to control Okra Jassid, three times applications were made at 7 days interval. The Jassid population varied significantly with the application of insecticide and botanicals. Admire 200 SL give the best result among the treatment. Out of three botanicals Karanja repelled 93.33%, where as Mahogoni and Neem repelled 86.66 and 63.33%.The effectivity of botanicals and synthetic insecticides was found in the following order: Admire 200 SL> Karajan oil >Mahogani oil >Neem oil.

Keywords: Okra Jassid, Synthetic insecticide, Plant oil, Toxicity, Repellency

Location: The Entomology Field Laboratory of Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 00-02-2008

End Date: 00-05-2008

Program Area: Pest Management

Commodity: Insects, Extract (plant, seed)

Objectives:

To investigate the incidence of Okra Jassid, A. devastans, and to determine the efficacy of some indigenous plants oil such as neem, ( Aiadirachla indica, Karanja, (Pongania pinnata) and Mahogany, (Swietenia mahogani) oil against Okra Jassid and one insecticide Admire 200 SL.

Methodology:

For convenience of the study, three experiments were conducted. The first one comprised to investigate the population of Okra Jassid from control plots. Second one comprised of the application of insecticide (Admire 200 SL) and three botanical oils (Neem, karanja and Mahogani) for control of Okra Jassid. The third one was repellent effect of the botanicals. The first 2 experiments were conducted in the field laboratory and the 3^rd one was conducted in the IPM Laboratory, Department of Entomology Bangladesh Agricultural University, Mymensingh (BAU). Neem oil, Mahogani oil, Karanja oil and Admire 200 SL were collected from Department of Entomology, BAU, Mymensingh. From these plant oils and insecticides different concentrations were prepared with water (1.0, 2.0 and 3.0% each of Neem, Mahogani and Karanja oil and 0.6, 1.2 and 2.4% of Admire). The BARI Okra-1 Seeds were collected from BARI, Gazipur, and sown in the experimental plots at the rate of 54 seeds plot^-1 (three seeds pit^-1and 18 pits plot^-1). Seed were shown on 24^thFebruary, 2008. The plant spacing was 60 × 35 cm. The experiments consisting of 4 treatments combinations and were laid out in the Randomized Complete Block Design (RCBD). The entire experimental field was divided into 4 blocks. The each experimental block was divided into 3 plots. Each treatment was replicated three times. The test treatments comprised of insecticide (Admire 200 SL), and three botanicals (Neem, karanja and Mahogoni oil) and untreated control. The botanical treatments were done on each plot at 7 days interval and the chemical treatment thereafter. The recorded data were complied and tabulated for statistical analysis. Analysis of variance was done with the help of computer package MSTAT. The mean differences among the treatments were adjudged as per test with Duncan's Multiple Range Test (DMRT) and Least Significant Difference (LSD) when necessary.

Source of Information: Progress. Agric. 21(1 & 2): 1–7, 2010 ISSN 1017-8139

Article Link (Online Journal): http://www.banglajol.info/index.php/PA/article/view/16743/11779

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Jassid infestation varied in different growth stages of Okra plants and hampered okra production severely. The chemical insecticide Admire 200 SL was the most effective against Okra Jassid. Botanical oils were effective to some extent and among the botanical oils Karanja oil was the most effective against Okra Jassid. It should be advised to use Admire 200 SL for controlling Okra Jassid when the population of Jassid is very high. The botanicals could be applied when the Jassid population is low in the field. The botanicals are environment friendly and effective though not as Admire 200 SL. If botanicals are applied from the very beginning the population could be kept below economic injury level which is an important point of IPM

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