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Eco-friendly Management of Flower Thrips and Pod Borers of Mungbean Through Sesame Intercropping

Md. Altaf Hossain
Pulses Research Centre, BARI, Ishurdi, Pabna

Abstract/ Executive Summary:

Effectiveness of sesame intercropping in mungbean in managing flower thrips and pod borer of mungbean was studied at Pulses Research Centre, Ishurdi, Pabna during kharif-I, 2018. Sesame intercropping in mungbean reduced flower infestation by thrips and pod borer infestation significantly. Among the intercrop treatments, mungbean : sesame at 2:2 row ratio arrangements was found the best in reducing flower thrips and pod borer infestation. Sesame intercropping showed equivalent performance in reducing pod borer infestation as like as insecticide spraying (Imitaf 20 SL @ 0.5 ml/l). Significantly the highest mungbean equivalent yield (2121 kg/ha) and benefit (BCR 2.07) was obtained from mungbean intercrop with sesame at 2:2 row ratio followed by 3:2 row ratios. Intercropping sesame in mungbean provided higher equivalent yield and benefit than sole cropping of mungbean. Hence, sesame intercropping in mungbean might be eco-friendly management approach against flower thrips and pod borers of mungbean providing higher yield and benefit.

Keywords: Sesame, Intercropping, Thrips, Pod borers, Mungbean.

Location: Pulses Research Centre, Ishurdi, Pabna

Start Date: 00-00-2017

End Date: 00-00-2017

Program Area: Farming System

Commodity: Borer, Mungbean, Sesame, Sesame, Sesame, Sesame

Objectives:

To determine the effect of sesame intercropping in suppressing flower thrips and pod borers damage in mungbean.

Methodology:

The experiment was conducted at Pulses Research Center, Ishurdi, Pabna, Bangladesh during kharif-I 2018. There were six treatments viz., T₁ = Sole mungbean, T₂ = Mungbean : sesame (2 : 1 row ratio), T₃= Mungbean : sesame (2 : 2 row ratio), T₄ = Mungbean : sesame (3 :1 row ratio), T₅ = Mungbean : sesame (3 :2 row ratio), T₆ = Sole mungbean with spraying Imitaf 20 SL @ 0.5 ml/l. The experiment was laid out in randomized complete block design with three replications. The treatments were randomly allotted in each block. The unit plot size was 4.8m x 4m with a distance of 1m between the plots and 1.5m between the replications. The seeds of BARI Mung-6 and BARI Til-4 were sown on March 29 in rows with the spacing of 30 cm in each plot. The unit plot contains 16 rows x 4m. The plant populations of mungbean and sesame were maintained constant by keeping plant to plant distance 7 cm and 5 cm, respectively. Urea, triple super phosphate, muriate of potash and boric acid were applied in both sole and intercrop plots @ 40-90-40-7.5 kg/ha during final land preparation. Post sowing flood irrigation was done to provide sufficient soil moisture for seed germination to get optimum plant population in all the treatments. Imidacloprid (Imitaf 20 SL @ 0.5 ml/l) was sprayed three times - first at 100% flowering (33 DAS), second at 100% podding (40 DAS) and third at seed developing stage (47 DAS) of the crop. The population data for thrips in flowers were collected twice, at one day after both first and second spraying. Thrips population was assessed from 20 opened flowers which were randomly collected from two rows of each side of the sole mungbean plot avoiding border and central rows. In case of sesame intercrop plots, thrips population data were collected from middle rows of the plots in between the sesame intercrop. The collected flowers were immediately opened on the white paper board and counted the adult and immature thrips present in the flowers. At the maturity, pods of 10 randomly selected plants from the middle rows of each plot were collected and examined. The bored (infested) and the total numbers of pods were counted and the per cent pod infestation was calculated. The pods of central four rows of each plot comprising 4.8m²(1.2 x 4m) area were harvested in incase of sole crop. In intercrop treatments, whole plot was harvested. The pods of both mungbean and sesame were then threshed; grains were cleaned and sun dried. The grains obtained from each plot were converted into kg/ha. Mungbean equivalent yield was calculated by taking prevailing market prices of the commodity. The experimental data were analyzed by Genstat software. The per cent infestation data were transformed by square root for statistical analysis. Mean comparisons for treatment parameters were compared using Duncan’s Multiple Range Test at 5% level of significance. Returns (Tk/ha) and benefit cost ratio (BCR) were calculated on the basis of prevailing market prices of mungbean, sesame and other material & non material costs.

Source of Information: Annual Research Report, 2017 - 2018, Pulses Research Centre, BARI, Ishurdi, Pabna

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the study it is observed that intercropping sesame in mungbean reduced flower thrips and pod borer infestation significantly. Sesame intercropping in mungbean physically and chemically interfere both flower thrips and pod borers to infest mungbean. Due to frequent rainfall in this cropping season the mungbean plants are thin & flexible, gets excessive vegetative growth with less pod setting and accordingly provided the poor yield. Again due to higher market price of sesame than that of mungbean provided the higher mungbean equivalent yield in sesame intercrop treatments than sole cropping of mungbean. Hence, sesame intercropping in mungbean might be eco-friendly management approach against flower thrips and pod borers of mungbean providing higher yield and benefit profitable yield by managing rainfall enriched unfavourable cropping season to mungbean.

Knowledge Management: Report/Proceedings