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Evaluation of Different Management Packages Against Flower Thrips and Pod Borers of Mungbean (vigna Radiata L.)

MD. ALTAF HOSSAIN
Pulses Research Centre, RARS, BARI, Ishurdi, Pabna

Abstract/ Executive Summary:

Efficacy and profitability of different management packages comprising white sticky trap, bio-pesticide and synthetic insecticides were evaluated against flower thrips and pod borers of mungbean at Pulses Research Center, Ishurdi, Pabna, Bangladesh during kharif-1 2016. All the treatments reduced flower infestation by thrips and pod borer infestation significantly. The highest percentage of flower infestation and thrips population reduction was observed in by installing white sticky trap + spraying of chlorfenapyr (Intrepid 10 SC) + spraying with emamectin benzoate (Proclaim 5 SG) followed by farmers practice (spraying imidacloprid). Again, the highest pod borer infestation reduction was found in by 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 come from farmers practice (spraying imidacloprid). This might be due to the higher cost of Intrepid 10 SC and Proclaim 5 SG reduced the return and 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 borer, IPM, Marginal benefit cost ratio

Location: The experiment was conducted at Pulses Research Center, Ishurdi, Pabna,

Start Date: 00-00-2016

End Date: 00-00-2016

Program Area: Pest Management

Commodity: Borer, Mungbean

Objectives:

It is needed to develop bio-rational based 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 kharif-I 2016. The treatments were: T₁ = IPM Package 1: Planting site sanitation + installing white sticky trap + two sprays of azadirachtin (Bio-neem plus 1EC) @ 1ml/l water first at 100% flowering stage and second at after 7 days (100% podding stage) + 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: Planting site sanitation + installing white sticky trap + two sprays of chlorfenapyr (Intrepid 10 SC) @ 1ml/l water first at 100% flowering stage and second at after 7 days (100% podding stage) + 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, 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 March 30 in rows with the spacing of 30 cm. The unit plot contains 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 was applied @ 40-90-40-7.5 kg/ha during final land. White sticky trap was installed (one trap/plot) at flower bud initiation stage and kept it in the field upto harvest. Three sprays 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 yield data. At the maturity, all 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 calculated. The pods of central ten 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 by square root for statistical analysis. Mean comparisons for treatment parameters were compared using 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

Source of Information: Annual Research Report - 2015 - 2016, Pulses Research Centre, RARS, BARI, Ishurdi, Pabna

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From this study it is seen that spraying of chlorfenapyr (Intrepid 10 SC) @ 1 ml/l and imidacloprid (Imitaf 20 SL) @ 0.5 ml/l showed equally the best efficacy in reducing flower infestation and thrips population. Spraying of azadirachtin (Bio-neem plus 1EC) showed less efficacy in reducing flower infestation and thrips population compared to chlorfenapyr and imidachloprid. Spraying of spinosad (Success 2.5 SC) @ 1.25 ml/l showed best efficacy in reducing pod borer infestation followed by emamectin benzoate (Proclaim 5 SG). 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) found profitable in low level infestation of flower thrips and pod borer. Evaluated other IPM package might be profitable in that situation where severe infestation of flower thrips and pod borer occurs. For calculating income and benefit the following market prices were used: Mungbean = Tk. 50/kg, White sticky trap = Tk. 15/trap, 50 trap/ha, Bio-neem plus 1 EC = Tk. 3000/litre, Success 2.5 SC = Tk. 2600/litre, Intrepid 10 SC = Tk. 2000/litre, Proclaim 5 SG = Tk. 4500/kg and Imitaf 20 SL = Tk. 2100/litre. Labour wage for spraying insecticides = Tk. 300/day/labourer (8 hours day).

Knowledge Management: Report/Proceedings