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Management of Mango Hopper, Idioscopus Clypealis, Using Chemical Insecticides and Neem Oil

S. M. Adnan
Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

M. M. Uddin
Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

M. J. Alam
Bangladesh Institute of Nuclear Agriculture, Mymensingh 2202, Bangladesh

M. S. Islam
Bangladesh Institute of Nuclear Agriculture, Mymensingh 2202, Bangladesh

M. A. Kashem
Bangladesh Institute of Nuclear Agriculture, Mymensingh 2202, Bangladesh

M. Y. Rafii
Institute of Tropical Agriculture (ITA), University Putra Malaysia, 43400 Serdang, Selangor, Malaysia

M. A. Latif
Department of Crop Science, Faculty of Agriculture, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia; /Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted in Field Laboratory, Department of Entomology at Bangladesh Agricultural University, Mymensingh, during 2013 to manage the mango hopper, Idioscopus clypealis L, using three chemical insecticides, Imidacloprid (0.3%), Endosulfan (0.5%), and Cypermethrin (0.4%), and natural Neem oil (3%) with three replications of each. All the treatments were significantly effective in managing mango hopper in comparison to the control. Imidacloprid showed the highest efficacy in percentage of reduction of hopper population (92.50 ± 9.02) at 72 hours after treatment in case of 2nd spray. It also showed the highest overall percentage of reduction (88.59 ± 8.64) of hopper population and less toxicity to natural enemies including green ant, spider, and lacewing of mango hopper. In case of biopesticide, azadirachtin based Neem oil was found effective against mango hopper as 48.35, 60.15, and 56.54% reduction after 24, 72, and 168 hours of spraying, respectively, which was comparable with Cypermethrin as there was no statistically significant difference after 168 hours of spray. Natural enemies were also higher after 1st and 2nd spray in case of Neem oil.

Keywords: Mango Hopper, Chemical insecticides, Neem oil

Location: Entomology Field Laboratory at Bangladesh Agricultural University, Mymensingh.

Start Date: 00-00-2013

End Date:

Program Area: Pest Management

Commodity: Mango

Objectives:

The present research was undertaken to manage mango hopper, I. clypealis (Lethierry), using three nonpersistence chemical insecticides, namely, Imidacloprid, Endosulfan, Cypermethrin, and natural product Neem oil as well as to assess their toxic effects on natural enemies of mango hopper.

Methodology:

The experiment was conducted in the Entomology Field Laboratory at Bangladesh Agricultural University, Mymensingh. The experiment was performed following randomized complete block design (RCBD) having five treatments including control with three replications of each treatment. Five inflorescences from five different branches of the same tree were selected alternatively from top, middle, and bottom and were sprayed with each treatment. Selection of inflorescence was done as modified method developed. The treatments were three insecticides, namely, Imidacloprid, Endosulfan, Cypermethrin, and natural Neem oil. A control treatment was always maintained with three replications. Insecticides were sprayed as recommended dose and Neem oil was used as 3% concentration. Application of treatments and collection of data were done before 10 a.m. Data were counted on the number of hopper per inflorescence. Pretreatment data were taken just before and post treatment data were recorded after 24, 72, and 168 hours of spraying. The percentage reduction of insect population was computed using Henderson-Tilton’s formula, that is, % efficacy = [1−Ta/Ca×Cb/Tb] × 100 [6], where, Tb is the infestation in the treated plot before treatment, Ta is the infestation in the treated plot after treatment, Cb is the infestation in the control plot before treatment, and Ca is the infestation in the control plot after treatment.

Data were analyzed following ANOVA using statistical package SPSS (version 14.0). Significant differences among the means of different treatments were tested using Duncan multiple range test (DMRT). Efficacy of insecticides and Neem oil were tested on the basis of percentage reduction of hopper population. Along with this, effects of selected insecticides and Neem oil on natural enemies were assessed by taking pretreatment data just before spray and posttreatment data at 24 HAT of 1st, 2nd, and 3rd spray.

Source of Information: The Scientific World Journal, Volume 2014 (2014), Article ID 709614, 5 pages

Article Link (Online Journal): http://www.hindawi.com/journals/tswj/2014/709614/

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Chemical insecticides, Imidacloprid (0.3%), Endosulfan (0.5%), Cypermethrin (0.4%), and Neem oil (3%) were effective in managing mango hopper in comparison to the control. Imidacloprid showed the highest efficacy in percentage of reduction of hopper population at 72 hours after treatment in case of 2nd spray. It also showed the highest overall percentage of reduction of hopper population and less toxicity to natural enemies of mango hopper. In case of biopesticide, azadirachtin based Neem oil was found effective against Mango hopper as 48.35, 60.15, and 56.54% reduction after 24, 72, and 168 hours, respectively. The population of natural enemies was also found higher in case of Neem oil even after 1st and 2nd spray. So, it could be concluded that sole dependency on conventional insecticides may easily be modified by incorporating Neem oil as an environment friendly management program for mango hopper.

Knowledge Management: Journal