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Comparative Efficacy of Different Botanicals and Chemical Insecticides for Controlling Rice Stem Borer

A. K. Majlish
Department of Entomology, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

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

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

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

Abstract/ Executive Summary:

An experiment was carried out in the field laboratory, Department of Entomology, Bangladesh Agricultural University to find out the efficacy of different botanicals and chemical insecticides against rice stem borer during the period from July to December 2013. The treatments included Neem oil, Mahogany oil, combination of Neem and Mahogany oil, Bishkatali leaf extract, Lantana leaf extract, combination of Bishkatali and Lantana leaf extract, Convoy 25EC, Biesterthoate 40EC, Biesteren 5G and Diatone 10G. The efficacies of treatments were evaluated based on the percent dead heart and white head resulted by rice stem borer infestation at vegetative and reproductive stages, respectively. The efficacies of treatments were varied significantly against the rice stem borers. Among the selected botanicals, Neem + Mahogany oil followed by Bishkatali leaf extract performed best and Bishkatali + Lantana followed by Lantana leaf extract and leaf extract were least effective to reduce dead heart as well as white head at different counting. Similarly, combination of Neem and Mahogany oil gave the maximum yield among the selected botanicals. Diatone 10G showed the best performance to reduce percent dead and white head among the selected chemical insecticides and gave maximum yield among different chemical insecticides. On the other hand, Convoy 25EC was the least effective to control dead heart and white head infestation with yield. Therefore, Neem + Mahogony oil and Diatone 10G were the best to control rice stem borer and to increase the yield of rice grain.

Keywords: Efficacy, Botanical, Chemical insecticide, Control, Rice, Stem borer

Location: Department of Entomology, BAU, Mymensingh

Start Date: 00-07-2013

End Date: 00-12-2013

Program Area: Pest Management

Commodity: Extract (plant, seed), Insecticide

Objectives:

The present research was carried out to evaluate the efficacy of different botanicals and chemical insecticides against the infestation caused by rice stem borer and find out the effect of different botanicals and chemical insecticides on the rice yield.

Methodology:

The experiments were conducted in the Entomology Field Laboratory, Department of Entomology, Bangladesh Agricultural University, Mymensingh during the period of July to December 2013. At first the land (123.75 m²) was prepared by ploughing and cross ploughing followed by laddering. All stubbles and weeds were removed carefully. The land was divided into 3 blocks and each block was divided into 11 plots of 2 m² maintaining 0.5 m spacing in between two plots and 0.25 m from border to facilitate different intercultural operations.10 treatments and a control were laid out in a Randomized Complete Block Design (RCBD) with 3 replications of each.Rice variety, BR11 was used for the experiment and seedlings were collected from the Central Farming System of BAU. After transplanting, all recommended agronomic practices along with fertilizers were applied. For the preparation of Lantana (Lantana camara) and Bishkatali (Polygonum hydropiper) extract, leaves were cut into small pieces and mixed with 2% formalin solution and were extracted using an electric mixer. On the other hand, Neem and Mahogany oil were collected from Mati Corporation Ltd, Uttara, Dhaka. These oils were diluted as required with adding water and 1 mg detergent was mixed in each one liter solution. The treatments were applied with the help of a hand-operated sprayer at 10 days interval started at 45 days of transplanting for counting dead heart and at 10 days after panicle initiation for counting white head. Care was taken to avoid spray drift on adjacent plants. The spraying was done in such a way that the spray droplet did not coalesce and drain down in the soils and whole plot was thoroughly covered by spray material. After spraying each treatment with designed dose, the sprayer was washed and cleaned properly. The control plots were not sprayed with anything. All of the treatments were applied for three times, two applications were done at the tillering stage and the last application was done at the panicle initiation stage. Before each application total number of dead heart (at vegetative stage), white heads (at reproductive stage) and total number of tillers were counted for each plot. Pre-treatment data were also recorded before application of botanicals and synthetic insecticides for better understanding. The percentage dead hearts and white heads were computed by using the Abbott’s (1925) formula.

Data for yield per plot were also recorded after harvesting of rice. The recorded data were compiled and tabulated for statistical analysis. Analysis of variance was done with the help of computer package MSTAT-C. 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: J. Bangladesh Agril. Univ. 13(2): 183–189, 2015 ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the present study it was observed that the application of botanicals and chemical insecticides showed significant performance in reducing dead heart, white head and increasing of yield of rice in comparison to untreated control. Among the botanicals mixture of neem oil and mahogany oil and among the chemical insecticide Diatone 10G provided the best efficacy in reducing the stem borer infestation and increasing rice yield. On the basis of reduced borer infestation and high yield neem oil & mahogany oil could be recommended as alternative of the insecticides in successful management of rice stem borer.

Knowledge Management: Journal