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Evaluation of Some Integrated Management Approaches Against Flower Thrips and Pod Borers of Mungbean (vigna Radiata L.)

Md. Altaf Hossain*
Pulses Research Centre, Bangladesh Agricultural Research Institute, Ishurdi, Pabna-6620, Bangladesh

M. A. Sarker
Bangladesh Agricultural Research Institute, Joydebpur, Gazipur-1701, Bangladesh

M. G. Azam
Pulses Research Centre, Bangladesh Agricultural Research Institute, Ishurdi, Pabna-6620, Bangladesh

Abstract/ Executive Summary:

Efficacy and profitability of different management packages comprising white sticky trap, biopesticide and synthetic insecticides were evaluated against flower thrips and pod borers of mungbean at Pulses Research Center, Ishurdi, Pabna, Bangladesh during two consecutive seasons of kharif-1, 2015 & 2016. All the treatments significantly reduced flower infestation by thrips and pod borer infestation. The highest percentage of flower infestation and thrips population reduction was observed in installing white sticky trap + spraying of chlorfenapyr (Intrepid 10 SC) + spraying with emamectin benzoate (Proclaim 5 SG) followed by farmers practice, i.e. spraying imidacloprid (Imitaf 20 SL). Again, the highest pod borer infestation reduction was found in installing white sticky trap + spraying azadirachtin (Bio-neem plus 1EC) + spraying with spinosad (Success 2.5 SC) treated plots followed by installing white sticky trap + spraying chlorfenapyr (Intrepid 10 SC) + spraying with emamectin benzoate (Proclaim 5 SG). The highest grain yield was obtained from installing white sticky trap + spraying chlorfenapyr (Intrepid 10 SC) + spraying with emamectin benzoate (Proclaim 5 SG), but the highest return came from farmers practice (spraying Imidacloprid). This might be due to the higher cost of Intrepid 10 SC and Proclaim 5 SG reduced the return as well as benefit. Therefore, considering the efficacy and benefit, it is seen that the evaluated IPM package could not be profitable against low level infestation of flower thrips and pod borer infestation. It could be profitable that areas where serious out break of flower thrips and pod borer occurs.

Keywords: Mungbean, Flower thrips, Pod borers, Integrated management approaches, Yield.

Location: Pulses Research Center, Ishurdi, Pabna, Bangladesh

Start Date: 00-00-2015

End Date: 00-00-2016

Program Area: Pest Management

Commodity: Insects, Mungbean

Objectives:

Therefore, it is needed to develop bio-rational based integrated management approach to control mungbean pests specially flower thrips and pod borer and save the crop from significant yield loss. Keeping this in view, attempts have been made to evaluate the efficacy of some IPM package and its economics to manage flower thrips and pod borers.

Methodology:

The experiment was conducted at Pulses Research Center, Ishurdi, Pabna, Bangladesh during two consecutive seasons of kharif-I in the years 2015 & 2016. There were four treatments viz. T1, T2 and T3 in the integrated program. The treatments were: T1 = IPM Package 1: Installing white sticky trap + two sprays of azadirachtin (Bio-neem plus 1EC) @ 1ml/l water first at 100% flowering stage and second at 100% podding stage after 7 days + third spraying with spinosad (Success 2.5 SC) @ 1.25 ml/l of water at seed developing stage (7 days after second spray), T2 = IPM Package 2: Installing white sticky trap + two sprays of chlorfenapyr (Intrepid 10 SC) @ 1ml/l water first at 100% flowering stage and second at 100% podding stage after 7 days + third spraying with emamectin benzoate (Proclaim 5 SG) @ 1g/l of water at seed developing stage (7 days after second spray), T3= Farmers’ practice: Three spraying of imidacloprid (Imitaf 20 SL) @ 0.5ml/l of water at 7 days interval starting from 100% flowering stage and T4 = Untreated control (Water spray only). The experiment was laid out in randomized complete block design (RCBD) with four replications. The treatments were randomly allotted in each block. The unit plot size was 4.5m x 4m with a distance of 1.5m between the plots and 1.5m between the replications. The seeds of BARI Mung-6 were sown on 24 March in rows with the spacing of 30 cm in both the years. The unit plot contained 15 rows x 4m. The plant populations were maintained constant by keeping plant to plant distance 7 cm. Urea, triple super phosphate, muriate of potash and boron fertilizers were applied @ 40-90-40-7.5 kg/ha during final land. Two hand weedings were done 12 and 24 days after sowing respectively. White sticky trap was installed (one trap/plot) at flower bud initiation stage and kept it in the field upto harvest. Three sprayings were done, first at 100% flowering stage (35 DAS), second at 100% podding (42 DAS) and third at seed developing stage (49 DAS). The population data for thrips in flowers were collected before spraying and one day after spraying. Thrips population was assessed from 20 opened flowers which were randomly collected from two rows of each side of the plot avoiding border and central four rows. The collected flowers were immediately opened on the white paper board and counted the adult and immature thrips present in the flowers. Central nine rows were kept undisturbed for recording data on grain yield. At maturity, all pods were collected from 10 randomly selected plants from the 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 calculated. The pods of central nine rows of each plot comprising 10.8 m²(4m x 2.7m) area were harvested. The pods were then threshed; grains were cleaned and sun dried. The grains obtained from each plot were converted into kg/ha. The experimental data were analyzed by MSTAT-C software. The per cent infestation data were transformed into square root for statistical analysis. Mean comparisons for treatment parameters were compared by following F-test and Duncan’s Multiple Range Test at 5% level of significance. The marginal benefit cost ratio (MBCR) was calculated on the basis of prevailing market prices of mungbean, cost of white sticky trap and cost of insecticidal spraying. Marginal benefit cost ratio was calculated as follows: Marginal BCR=Benefit over control/Cost of Treatments.

Source of Information: Jahangirnagar University J. Biol. Sci. 7(1): 55-64, 2018 (June)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Therefore, considering overall efficacy and benefit of the evaluated IPM package it could be concluded that farmer’s practice, i.e. spraying of Imidacloprid (Imitaf 20 SL @ 0.5 ml/l) was found profitable in low level infestation of flower thrips and pod borer. Other IPM packages evaluated might be profitable in that situation where severe infestation of flower thrips and pod borer occurs.

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