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Determination of Economic Injury Levels of Maruca Vitrata in Mungbean

M. A. ZAHID
Agriculture Research Station, BARI, Burirhat, Rangpur, Bangladesh

M. M. ISLAM
Rangpur Dinajpur Rural Service (RDRS), Rangpur, Bangladesh

M. R. BEGUM
Regional Agriculture Research Station, BARI, Ishurdi, Pabna, Bangladesh

Abstract/ Executive Summary:

Maruca vitrata is considered to be one of the major pests of mungbean. The damage potential and economic threshold levels of Maruca vitrata larvae on mungbean were worked out at ARS, BARI, Burirhat, Rangpur during rabi 2005-2006 and 2006-2007. On an average single larva per m row reduced the yield to the extent of 154 kg/ha and 106 kg/ha in 2005-2006 and 2006-2007 cropping seasons, respectively. The ratio of the value of yield saved to the cost of insecticide application at one larva per m row in 2005-2006 was 1.45 and same in 2006-2007 was 1.34. EIL for Maruca vitrata were determined as 1.0 and 1.16 larvae per m row in 2005-2006 & 2006-2007 respectively. ET value was determined from EILs and those were found to be at 0.75 and 0.87 larvae per m row in 2005-2006 & 2006-2007 respectively. On the basis of means of two years the EIL and ETL values of Maruca vitrata were 1.08 & 0.81 larvae per m row, respectively.

Keywords: ETL, EIL, Maruca vitrata, Mungbean

Location: Burirhat, Rangpur

Start Date: 00-00-2005

End Date: 00-00-2007

Program Area: Pest Management

Commodity: Mungbean

Objectives:

The present research work was undertaken to determination the EIL of M. vitrata.

Methodology:

The experiment was conducted at ARS, Burirhat, Rangpur during rabi seasons of 2005-2006 and 2006-2007. The methods of artificial infestation by different levels of larval population were followed to establish the economic injury levels of M. vitrata. The EIL was determined based on the benefit cost ratio as suggested by Farrington (1977). There were six treatments consisted of six different larval density i.e. 0, 1, 2, 3, 4 and 5 larvae per m row length, released at flowering stage of the crop. Seeds were sown in row, maintaining row to row distance. The experiment was laid out in Randomized Complete Block Design (RCBD). The plants of one meter row length was covered with nylon mesh cages of 1.0 × 0.5 ×1.0 m size before flowering to avoid natural infestation. The cages were designed in such a way that they did not interrupt ventilation and aeration to the growing plants inside. The bottom edges of the cages were inserted into the soil in all sides to check the escape or entry of larvae. These nylon net cages were erected on bamboo sticks fixed in four corners. The second or third instar larvae were released once at the time of flowering and subsequently at 15 days interval to maintain constant population till the maturation stage of the pod. Pupae and prepupal stages of larvae from the previous release were collected at the time of next release. The number of total and damaged pods and weight of grains from all the covered plants of each cage were recorded. Relationship between the larval density and the percentage of pod damage was worked out by correlation co-efficient and regression equations. Yield data were converted into kg/ha. Yield losses due to different treatments were derived by deducting the yield of the respective treatment from the yield of control (where no larvae were released). The value of yield loss was determined according to the wholesale market price of mungbean grains prevailing at Rangpur just after harvest during the season. Eighty percent of the yield loss was considered to be avoided with insecticidal treatment, hence was taken as avoidable loss or yield saved. Benefit cost ratio (BCR) was worked out as the ratio of the value of yield saved to the cost of insecticidal application. Cypermethrin @ 0.02% was considered for calculating the cost of insecticidal application. Finally, the economic injury level for pod borer larvae was calculated by fitting regression equation Y = a+bx, between larval population levels and BCR. The larval density corresponding to unit benefit cost ratio was the economic injury level and economic threshold level was set at 75% of EIL (Pedigo, 1991).

Source of Information: J Agric Rural Dev 6(1&2), 91-97, June 2008 ISSN 1810-1860

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

On the basis of means of two years the EIL and ETL values of Maruca vitrata were 1.08 & 0.81 larvae per m row, respectively. Results of the present study showed that the control measures should be initiated when the Maruca vitrata larval population reaches one larva per m row length in mungbean plants in order to prevent the population in reaching economic injury levels.

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