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Determination of Economic Injury Levels of Maruca Virata in Mungbean

Md. Anwar Zahid
Scientific Officer
ARS, Burirhat, Rangpur

Md. Hafiz Ullah
Principal Scientific Officer
ARS, Burirhat, Rangpur

Abstract/ Executive Summary:

The damage potential and economic thereshold levels of Maruca virata larvae on mungbean were worked out at ARS, BARI, Burirhat, Rangpur during rabi 2005-2006. On an average single larva per m row reduced the yield to the extent of 154 kg/ha and 106 kg/ha in 2005 and 2006 cropping season, respectively. The ratio of the value of yield saved to the cost of insecticide application at one larva per m row in 2005 was 1.45 and same in 2006 was 1.34. EIL for Maruca virata were determined as 1.0 and 1.16 larvae per m row in 2005 & 2006 respectively. ET value was determined from EILs and these were found to be at 0.75 and 0.87 larvae per m row in 2005 & 2006 respectively. On the basis of means of two years the EIL and ETL value of Maruca virata were 1.3 & 0.81 larvae per m row respectively

Keywords: Economic injury levels, Maruca virata, mungbean

Location: ARS, Burirhat, Rangpur

Start Date: 25-11-2006

End Date: 15-02-2007

Program Area: Pest Management

Commodity: Mungbean

Objectives:

To find out the economic injury level of Maruca virata infesting mungbean

Methodology:

The experiment was conducted at ARS, Burirhat, Rangpur during rabi seasons of 2004-05 and 2005-2006. 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 and maintaining row to row distance. The experiment was laid out in RCBD. The second or third instar larvae were used for this purpose. The plants of one meter row length was covered with nylon mesh cages of 1.0 × 0.5 ×1.0m size before flowering to avoid natural infestation. The larvae were released once at the time of flowering and subsequently at 15 days interval to maintain constant population throughout. Pupae and pre-pupal stages of larvae from the previous release were collected at the time of next release. The population density was maintained till the pod maturation stage. The number of total and damaged pods and weight of grains from all the covered plants of each cage were worked out. Yield data were converted into kg/ha. Yield losses due to different treatments were derived by deduction the yield in the respective treatment from the yield of control.. The value of yield loss was determined according to the wholesale market price of mungbean grains prevailing at Rangpur 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: Annual Report 2006-2007, Entomology Division, BARI , Gazipur

Article Link (Online Journal):

Funding Source:

1.	Budget: 10000.00

Total Budget (Tk.) : 10000.00

Achievement/Findings:

EIL for Maruca virata in mungbean were determined as 1.0 and 1.16 larvae per m row in 2005 & 2006 respectively. ET value was determined from EILs and these were found to be at 0.75 and 0.87 larvae per m row in 2005 & 2006 respectively. On the basis of means of two years the EIL and ETL value of Maruca virata were 1.3 & 0.81 larvae per m row respectively

Knowledge Management: Report/Proceedings