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Evaluation of Some Integrated Management Packages Against Flower Thrips and Pod Borers of Mungbean (2019--2020)

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

Abstract/ Executive Summary:

Effectiveness of integrated management approaches using a blue sticky trap, bio and synthetic insecticides were evaluated against flower thrips and pod borers of mungbean at Pulses Research Centre, Ishurdi, Pabna, Bangladesh during Kharif I 2020. All of the management packages significantly reduced flower infestation, thrips population and pod borer infestation in mungbean. The highest percentage of reduction of flower infestation and thrips population was observed in the IPM package 3: (Installing blue sticky trap + two sprayings of chlorfenapyr (Intrepid 10 EC) @ 1 ml/l at 100% flowering and 100% podding stage + third spraying with Emamectin Benzoate (Proclaim 5 SG) @ 1 g/l at seed developing stage) followed by farmers practice. But the highest pod borer infestation reduction was found in IPM package 2 followed by IPM package 3, IPM package 1 and farmers practice. The highest yield and accordingly additional return come from IPM package 2: (Installing blue sticky trap + two sprayings of Bio-Chamak (Celastrus angulatus !% EW) @ 2.5 ml/l at 100% flowering and 100% podding stage + third spraying with spinosad (Success 2.5 EC) @ 1.2 ml/l at seed developing stage) followed by farmers practice and IPM package 1. But the highest benefit (MBCR 3.39) comes from recommended practice (Farmers practice). This might be due to the higher cost of IPM components brought down the profit margin and showed a lower MBCR than that of recommended practice (farmer’s practice). Although IPM packages under this study are not financially profitable as a recommended practice but considering environment friendliness, the IPM package 2: (Installing blue sticky trap + two sprayings of Bio-Chamak (Celastrus angulatus !% EW) @ 2.5 ml/l at 100% flowering and 100% podding stage + third spraying with spinosad (Success 2.5 EC) @ 1.2 ml/l at seed developing stage) would be the best package for controlling flower thrips and pod borers of mungbean with higher yield in the insects prone cropping areas without harming the ecosystem.

Keywords: IPM , Synthetic insecticides, Pod borers, Mungbean

Location: Pulses Research Centre, Ishurdi, Pabna

Start Date: 00-00-2019

End Date: 00-00-2020

Program Area: Pest Management

Commodity: Insects, Mungbean, Insecticide

Objectives:

An attempt has been made to developing and evaluate a safe and effective integrated management package using the blue sticky trap, bio, and synthetic insecticides.

Methodology:

The experiment was conducted at Pulses Research Centre, Ishurdi, Pabna, Bangladesh during Kharif-I, 2020. Installing blue sticky trap and application of bio & synthetic insecticides considered as treatments of the experiment which were: T₁ = IPM Package-1: Installing blue sticky trap + two spraying of Biotrine (Matrine 0.5% AS) @ 1.4 ml/l, first spray at 100% flowering stage and second spray after 7 days interval at peak flowering and 100% podding stage + third spraying with spinosad (Success 2.5 EC) @ 1.2 ml/l after 7 days of second spray at seed developing stage, T₂ = IPM Package-2: Installing blue sticky trap + two spraying of Bio-chamak (Celastrus angulatus 1% EW)) @ 2.5 ml/l, first, spray at 100% flowering stage and second spray after 7 days the interval at peak flowering and podding stage + third spraying with spinosad (Success 2.5 EC) @ 1.2 ml/l at seed developing stage (7 days after the second spray), T₃ = IPM package-3: Installing blue sticky trap + two spraying of chlorfenapyr (Intrepid 10 EC) @ 1 ml/l, first, spray at 100% flowering stage and second spray after 7 days at peak flowering and podding stage + third spraying with Emamectin Benzoate (Proclaim 5 g) @ 1 g/l at seed developing stage ( 7 days after the second spray), T₄= Recommended practice: Three spraying of imidachloprid (Imitaf 20 SL) @ 0.5 ml/l of water at 100% flowering, 100% podding and seed developing stage of the crop and T₅= Untreated control. The experiment was laid out in randomized complete block design with three dispersed replications. The treatments were randomly allotted in each block. The seeds of BARI Mung-6 were sown on March 24, 2020, in rows with a spacing of 30 cm. The unit plot size was 6m x 4m. Urea, triple superphosphate, muriate of potash, and boric acid were applied in the 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. The populations of the plant were maintained constant by keeping plant to plant distance of 7 cm. Blue sticky traps were installed (one trap/plot) at the flower bud initiation stage and kept in the field up to harvest. Treatment-wise bio & synthetic insecticides were sprayed first at 100% flowering stage and second and third spray were done after 7 days interval at 100 % podding stage and seed developing stage, respectively. The flower infestation and flower thrips population data were collected before every spray application and after 24 hrs of each spraying. Thrips population was assessed from 20 opened flowers randomly collected from four rows of each side of the plot avoiding border and central ten rows. The collected flowers were immediately opened on the white paper board and counted the adult and immature thrips present in the flowers were. Central ten rows were kept undisturbed for recording yield data. At maturity, all the 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 percent pod infestation was determined.

The pods of the central ten rows of each plot were harvested. The pods were then threshed; grains were cleaned and dried in the bright sunshine. The grain yield was obtained from the central four rows of each plot was converted into per hectare. The experimental data were analyzed by Statistics 10 software. The percent infestation data were transformed by square root for statistical analysis. Mean comparisons for treatment parameters were compared using the LSD All-Pairwise Comparisons Test at a 5% level of significance. The marginal benefit-cost ratio (MBCR) was calculated on the basis of prevailing market prices of mungbean and the cost of blue sticky trap and insecticidal spraying. Marginal benefit-cost ratio

Source of Information: Annual Research Report 2019--2020, Pulses Research Centre, RARS, BARI, Ishurdi, Pabna

Article Link (Online Journal):

Funding Source:

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Achievement/Findings:

The highest percentage of reduction of flower infestation and thrips population was observed in the IPM package 3: (Installing blue sticky trap + two spraying of chlorfenapyr (Intrepid 10 EC) @ 1 ml/l at 100% flowering and 100% podding stage + third spraying with Emamectin Benzoate (Proclaim 5 SG) @ 1 g/l at seed developing stage) followed by farmers practice. But the highest pod borer infestation reduction was found in IPM package 2 followed by IPM package 3, IPM package 1, and farmers practice. The highest yield and accordingly additional return come from IPM package 2: (Installing blue sticky trap + two spraying of Bio-Chamak (Celastrus angulatus !% EW) @ 2.5 ml/l at 100% flowering and 100% podding stage + third spraying with spinosad (Success 2.5 EC) @ 1.2 ml/l at seed developing stage) followed by farmers practice and IPM package 1. But the highest benefit (MBCR 3.39) comes from recommended practice (Farmers practice). This might be due to the higher cost of IPM components brought down the profit margin and showed a lower MBCR than that of recommended practice (farmer’s practice).

Although IPM packages under this study are not financially profitable as a recommended practice but considering environment friendliness, the IPM package 2: (Installing blue sticky trap + two spraying of Bio-Chamak (Celastrus angulatus !% EW) @ 2.5 ml/l at 100% flowering and 100% podding stage + third spraying with spinosad (Success 2.5 EC) @ 1.2 ml/l at seed developing stage) would be the best package for controlling flower thrips and pod borers of mungbean with higher yield in the insects prone cropping areas without harming the ecosystem.

Knowledge Management: Report/Proceedings