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Development of Insecticide Application Schedule for Management of Flower Thrips and Pod Borer in Mungbean (vigna Radiata L.)

MD. ALTAF HOSSAIN
Principal Scientific Officer
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute (BARI), Ishurdi 6620, Pabna, Bangladesh.

Abstract/ Executive Summary:

The experiments were conducted to develop insecticide (Imidachlorpid, Imitaf 20SL at 0.5 ml/l) application schedule for the effective management of thrips and pod borer attacking mungbean during kharif-I season of 2010 and 2011. In both the years, suppression of thrips population and pod borer infestation were higher in double sprayed treatment than single spraying. Single spraying at 35 DAS (100% flowering) and 42 DAS (100% podding stage) suppressed flower infestation by thrips upto 86 and 93%, respectively, during 2010 and 100 & 96%, respectively, during 2011. Double spraying at 42 DAS (100% podding) and 49 DAS (seed developing stage) reduced more pod borer infestation as much as 81-83%. In kharif-I 2010, significantly the highest yield (1798 kg/ha) and MBCR (4.67) were obtained from the plots sprayed twice with Imidachlorpid at 42 DAS (100% podding) and 49 DAS (seed developing stage) but in kharif-I 2011, significantly the highest yield (1457 kg/ha) and MBCR (5.75) were obtained from the plots sprayed twice with Imidachlorpid at 35 DAS (100% flowering) and 42 DAS (100% podding stage). The double spray schedule appeared to be more effective than single spraying against pod borer. But single spray at 42 DAS (100% podding stage) appeared as more effective against flower thrips.

Keywords: Insecticide application schedule, Thrips, Pod borer, Management, Mungbean

Location: Ishurdi, Pabna

Start Date: 00-00-2010

End Date: 00-00-2011

Program Area: Pest Management

Commodity: Mungbean

Objectives:

To develop an insecticide (Imidachlorpid, Imitaf 20SL) application schedule for the effective and economic management of thrips and pod borer attacking mungbean.
To ensure economic production.

Methodology:

The experiments were conducted at Pulses Research Center, Ishurdi, Pabna, Bangladesh during kharif-I, 2010 and 2011. There were 6 treatments of Imidachlorpid (Imitaf 20SL) spraying at 0.5 ml/l at different growth stages of mungbean viz., 1. Spraying at 35 DAS (at 100% flowering stage), 2. Spraying at 42 DAS (100% podding stage), 3. Spraying at 49 DAS (at seed developing stage), 4. Spraying at (35 + 42) DAS (at 100% flowering and 100% podding stage), 5. Spraying at (42 and 49) DAS (100% podding and seed developing stage) and 6. Untreated control. The experiments were laid out in RCB design with three replicates. The treatment was randomly distributed in each replicate. The unit plot size was 3m x 4m with a distance of 100 cm between the plots and 150 cm between the replicates. The seeds of BARI Mung-6 were sown in March 25, 2010 and March 20, 2011 in rows with the spacing of 30 cm. The BARI Mung-6 is the most popular short duration variety which covers majority of the areas in Bangladesh. It initiates flowering at 30 days after sowing (DAS) and 100% flowering at 35 DAS, 100% podding at 42 DAS, seed developing at 49 DAS and ripening at 55 DAS. The populations of the plant were maintained constant by keeping plant to plant distance of 7 cm. NPK fertilizers @ 20-40-20 kg/ha in the form of urea, triple super phosphate and muriate of potash were applied during final land preparation. Imidachlorpid (Imitaf 20SL) was sprayed at 0.5 ml/litre according to the growth stages as described under five treatments. Normal intercultural operations were done. The data on the population of thrips (Megalurothrips distalis) were collected before and after 24 hours of each spraying. Thrips population was assessed from 20 opened flowers randomly collected from both side of two rows in each plot avoiding border rows and central four rows. The collected flowers were immediately opened on the white paper board and counted the thrips. Central four rows were kept undisturbed for recording yield data. At maturity, all the pods were collected from 10 randomly selected plants from central four rows of each plot and examined. The infested (bored) and total numbers of pods were counted and the per cent pod infestation was determined.The pods of central four rows of each plot comprising 4.8m2 (1.2m x 4m) area were harvested. The pods were then threshed, grains were cleaned and dried in the bright sunshine. The grain yield obtained from each plot was converted into per hectare. The experimental data were analyzed by MSTAT-C software. The per cent data were transformed by square root transformation for statistical analysis. Treatment mean were compared using Duncan’s Multiple Range Test . The marginal benefit cost ratio (MBCR) was calculated on the basis of prevailing market price of mungbean, Imidachloprid and spraying cost. Marginal benefit cost ratio was calculated as follows: MBCR= (Benefit over control/Cost of treatment).

Source of Information: Bangladesh J. Agril. Res. 38(1): 19-28, March 2013, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the above discussion, it was found that single spray of Imidachloprid (Imitaf 20SL) at 0.5 ml/l reduced flower infestation and thrips population and double spraying on pod borer infestation significantly. Double spraying had longer insecticidal action and was more effective than single spraying. Single spraying at 42 DAS (100% podding) and double spraying at 42 DAS (100% podding) and 49 DAS (seed developing stage) provided the highest yield and MBCR against pod borer infestation. For managing thrips and pod borer in mungbean field effectively and to get the highest yield and benefit the above spray schedule might be useful.

Knowledge Management: Journal