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Efficacy of Some Synthetic Insecticides and Neem Seed Oil for the Management of Thrips of Mungbean Vigna Radiate (l.) Wilezek

M G Azam
Department of Entomology & Horticulture, Hajee Mohammad Danesh Science & Technology University, Dinajpur 5200, Bangladesh

M M H Bhuyain
Department of Entomology & Horticulture, Hajee Mohammad Danesh Science & Technology University, Dinajpur 5200, Bangladesh

M N Uddin
Department of Entomology & Horticulture, Hajee Mohammad Danesh Science & Technology University, Dinajpur 5200, Bangladesh

M T Islam
Department of Entomology & Horticulture, Hajee Mohammad Danesh Science & Technology University, Dinajpur 5200, Bangladesh

K H Kabir
Department of Entomology & Horticulture, Hajee Mohammad Danesh Science & Technology University, Dinajpur 5200, Bangladesh

Abstract/ Executive Summary:

Field study was carried out at Bangladesh Agricultural Research Institute (BARI) farm during March to August 2005 to find out the most appropriate management practices against thrips of mungbean. The experiment consisted of seven treatments of various management practices. It was laid out in Randomized Complete Block Design (RCBD) with four replications. The incidence of this pest was first noticed during vegetative and flowering stage. The infestation rate was highest in reproductive stage. Application of Furadan 5G as a seed treatment gave the maximum yield (950.5 kg/ha). On the other hand, minimum yield was found in control treatment. Two times application of Shobicron 425 EC also gave the satisfactory result but it was not economically viable. Neem oil with Trix gave the significant result in comparison with other treatments and it may be environmentally friendly.

Keywords: Efficacy, Synthetic and botanical insecticides, Megalurothrips distalis, Yield.

Location: Experiment farm of the Entomology Division of Bangladesh Agricultural research Institute (BARI), Gazipur, Bangladesh

Start Date: 00-03-2005

End Date: 00-06-2005

Program Area: Pest Management

Commodity: Mungbean

Objectives:

The present study was undertaken to fulfill the following objectives a) to document the abundance and damage severity of thrips in mungbean, and b) to find out the most economical doses for the management of these pests in mungbean.

Methodology:

Field trials were carried out at the experiment farm of the Entomology Division of Bangladesh Agricultural research Institute (BARI), Gazipur, Bangladesh during March 2005 to June 2005. The experiment consisted of seven treatments of various management practices viz. i) seed treatment by Furadan 5G (Carbofuran) @ 4% before sowing ii) seed treatment by Cruiser 70 WS (Imidaclorpid) @ 4% before sowing iii) neem seed oil @ 10 ml of water + Trix @ 5 ml/L of water at 20 DAS and following spray at an interval of 10 days and continued up to the maturity of the crop iv) spraying of Cymbush 10 EC (Cypermethrin) @ 1 ml/L of water at 20 DAS and at 35 DAS v) spraying of Ekalux 25 EC (Quinalphos) @ 2 ml/L of water at 20 DAS and at 35 DAS vi) Spraying of Shobicron 425 EC (Propenphos + Cypermethrin) @ 20 ml/L of water at 20 DAS and at 35 DAS and vii) control. Insecticides were procured from local market. Neem seed oil was collected from the Division of Entomology, BARI. Furadan, Cruiser, Neem seed oil, Cymbush, Ekalux and Shobicron were sprayed in assigned plots with the dosages by using Knapsack sprayer. At each application the spray mixture was freshly prepared. The experiment was laid out in a Randomized Complete Block Design (RCBD) with four replications in the field. The whole field was divided into four equal blocks having 1 m space between the blocks and each block was again sub-divided into 7 plots (3m × 3m each) as treatment plots with 0.6 m space between them. The spacing was 30 cm between rows and 10 cm between plants. The mungbean seeds (BARI mug-5) were collected from Pulse Research Centre, BARI, Joydebpur, Gazipur. All the seeds were subjected to germination test before sowing. In all cases, the rate of germination was found to be more than 90%. Seeds of mungbean were sown on 8 March, of 2005. After sowing, a light irrigation was given. Subsequent irrigations were applied in all the plots whenever required. Thinning, weeding in the plots was done at regular interval upto the flowering stage. The soil of the experimental land was clay loam texture, pH range 5.2 to 5.7, organic matter 1.12% and belongs to the Grey Terrace soils (AEZ-28). During experimentation maximum and minimum temperature, relative humidity and rainfall were recorded at an interval of 10 days. Ten plants per plot were tagged randomly from 6 inner rows leaving 15 cm from the corner. These plants were used for taking data on thrips. Thrips was counted in situ from five fully unfolded top leaves of the plant. Data was recorded at an interval of 10 days commencing from first incidence and continued up to the maturity of the crop. Overall, percentage of population reduction over control was calculated: The yield data (kg/ha) were recorded form treated and untreated plots. The difference between the seed yield in treated and untreated plots was considered as loss. The avoidable losses or percent increase in yield over untreated control was calculated. All data were analyzed by MSTAT software for analysis of variance (ANOVA). The percent data were transformed into square root wherever needed. Treatment means were separated by applying Least Significant Difference (LSD) test (Gomez and Gomez 1984).

Source of Information: J. bio-sci. 16: 105-108, 2008 ISSN 1023-8654

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The incidence of this pest was first noticed during vegetative and flowering stage. The infestation rate was highest in reproductive stage. Application of Furadan 5G as a seed treatment gave the maximum yield (950.5 kg/ha). On the other hand, minimum yield was found in control treatment. Two times application of Shobicron 425 EC also gave the satisfactory result but it was not economically viable. Neem oil with Trix gave the significant result in comparison with other treatments and it may be environmentally friendly.

Knowledge Management: Journal