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Field Performance and Economic Analysis of Some Commonly Used Insecticides Against Tea Mosquito Bug, Helopeltis Theivora W.

M. AHMED
Chief Scientific Officer
Entomology Division, Bangladesh Tea Research Institute (BTRC), Srimangal-3210, Moulvibazar, Bangladesh.

S. K. PAUL
Scientific Officer
Entomology Division, Bangladesh Tea Research Institute (BTRC), Srimangal-3210, Moulvibazar, Bangladesh.

M. S. A. MAMUN
Scientific Officer
Entomology Division, Bangladesh Tea Research Institute (BTRC), Srimangal-3210, Moulvibazar, Bangladesh.

Abstract/ Executive Summary:

A study was undertaken to evaluate the field performance and economic analysis of some commonly used insecticides against Tea mosquito bug, Helopeltis theivora Waterhouse at Bangladesh Tea Research Institute (BTRI), Srimangal, Moulvibazar. Six different insecticides–Thiodan 35EC (Endosulfan), Ripcord 10EC (Cypermethrin), Decis 2.5EC (Deltamethrin), Dimethion 40EC (Dimethoate), Metasystox 25EC (Oxydemeton), and Malathion 57EC (Malathion) were applied in the plots as recommended dose of BTRI. The shoot infestation reduction as well as yield response of all the insecticides treated plots were superior over the control but there was no significant difference among the insecticidal treatments. Better field performance against Helopeltis was found in Malathion 57 EC treated plots in respect to shoot infestation reduction over control (87.09%). Per hectare yield (1910.33 kg) as well as per hectare net return (Tk. 300927.80) were also higher in Malathion 57EC treated plots. The highest marginal rate of return (2580.57%) was obtained by spraying Metasystox 25EC over control followed by Ripcord IOEC (1710.87%) and other insecticides. The most economically acceptable insecticide against tea mosquito bug was Metasystox.

Keywords: Field performance, Economic analysis, Insecticides, Tea, Helopeltis theivora.

Location: Bangladesh Tea Research Institute (BTR1), Srimangal, Moulvibazar

Start Date: 00-04-2009

End Date: 00-11-2009

Program Area: Pest Management

Commodity: Insects

Objectives:

To evaluate the performance of some commonly used insecticides against tea mosquito bug.
To determine the most economically viable insecticide for controlling this pest.

Methodology:

The study was carried out in the main farm of Bangladesh Tea Research Institute (BTRI), Srimangal, Moulvibazar during the cropping period from April to November 2009. Seven treatments in a Randomized Completely Block Design (RCBD) were in seven plots each of 10m × 5m having 50 bushes per plot. Each treatment was replicated three times. Six treatments were the six insecticides with a recommended dose along with a control without insecticide were used . The insecticides were sprayed with CP 15 Knapsack sprayer mixing with 500 l/ha of water. The insecticides were applied six times as foliar spray for the control of Helopeltis during the cropping season. The first spray was done on the 4th of April, 3rd spray on 4th July, and 15th spray on 4th of October 2009 followed by a spray at 21 days after each of these dates. Other agronomic practices i.e., plucking round, pruning frequency, weeding were done by the farm management at 7 days, 4 years, 90 days interval, respectively, and mulching was done during dry period. An acute infestation was noticed at initial stage of study. It is recommended that if 10% pluckable shoots are infested only then insecticides should be applied (Ahmed et al., 1998). Therefore, the first application of the insecticides was made at this time. Pretreatment data was taken before spraying of chemicals. Post-treatment data, such as % shoot infestation as well as total shoot weight were recorded at weekly interval from each plot. Yield of the respective treatment plots were converted into yield per hectare. The per cent shoot infestation and shoot infestation reduction over control for each treatment were calculated. Only variable costs (costs of insecticides per hectare) of different insecticides were considered for these treatments and the rest of the costs were considered to be constant. Variable costs are those costs which vary proportionately with saleable produce. The economic analysis by using partial budgeting technique (Perri et al., 1988) was carried out to find out the economically viable insecticide against tea mosquito bug. The data were statistically analyzed by Randomized Complete Block Design (RCBD) using MSTAT statistical software in a microcomputer. The means were separated by Duncan’s Multiple Range Test (DMRT).

Source of Information: Bangladesh J. Agril. Res. 36(3) : 449-454, September 2011, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Shoot infestation reduction as well as tea yield were significantly higher with no significant difference among the plots treated with other insecticides than that of untreated control. From the economic point of view, Metasystox 25EC showed the highest marginal rate of return compared to all other insecticides. So, Metasystox 25EC @ 0.50 1/ha is the most economically acceptable insecticide for controlling tea mosquito bug.

Knowledge Management: Journal