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Effect of Weeding on the Incidence of Flower Thrips and Pod Borers of Mungbean (vigna Radiata L.) (2017--2018)

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

Abstract/ Executive Summary:

Effect of weeding on flower thrips and pod borer infestation in mungbean was studied at Pulses Research Centre, Ishurdi, Pabna during Kharif-I, 2018. Weeding in mungbean showed a significant effect against flower thrips and pod borer infestation. No weeding plots received less percentage of flower infestation by thrips than that of the plots weeded at one or two times. On the other hand, weeded plots received less percentage of pod borer infestation than that of no weeding plots. So, it is seen that weeding in mungbean received lower pod borer infestation but higher flower thrips infestation and the reverse was true in case of no weeding. Weeding showed a very remarkable effect in a yield increase of mungbean. Only weeding in mungbean increased up to 154.72% higher yield over no weeding plots but the higher cost of weeding failed to provide remarkable benefit. The highest benefit (MBCR 3.19) obtained from no weeding with insecticide (Imitaf 20 SL @ 0.5 ml/l) spraying followed by single weeding at 12 days after sowing (MBCR 1.88).

Keywords: Benefit-cost ratio, Mungbean, Pod borer, Thrips infestation, Weeding

Location: Pulses Research Centre, Ishurdi, Pabna

Start Date: 00-00-2018

End Date: 00-00-2018

Program Area: Pest Management

Commodity: Insects, Weed management, Mungbean

Objectives:

The present study has been taken to finding out the influence of weeding on the incidence of flower thrips and pod borer and its impact on the yield of mungbean

Methodology:

The experiment was conducted at Pulses Research Center, Ishurdi, Pabna, Bangladesh during Kharif-I 2018. The treatments were: T₁ = No weeding (Untreated control), T₂ = Spading and hand weeding at 12 DAS (days after sowing), T₃= Spading and hand weeding at 24 DAS, T₄ = Spading and hand weeding at (12 + 24) DAS, T₅ = T₄ + three times spraying of insecticide (Imitaf 20 SL) and T₆= No weeding + three times spraying of insecticide (Imitaf 20 SL). 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 3m x 4m with a distance of 1m 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 10 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 boric acid were applied @ 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 the seed developing stage (47 DAS) of the crop. Flower infestation by thrips and its population data were collected before insecticide 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 four rows were kept undisturbed for recording yield data. 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 percent pod infestation was calculated. The pods of central four rows of each plot comprising a 4.8m²(1.2 x 4m) 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 Genstat software. The percent infestation data were transformed by square root for statistical analysis. Mean comparisons for treatment parameters were compared using Duncan’s Multiple Range Test at a 5% level of significance. The marginal benefit-cost ratio (MBCR) was calculated on the basis of prevailing market prices of mungbean, cost of weeding and insecticidal spraying. The marginal benefit-cost ratio was calculated

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

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the study, it is seen that weeding showed a significant effect against flower thrips and pod borer infestation as well as the yield of mungbean. Weed repels the flower thrips resulted in less flower infestation in no weeding plots of mungbean than that of weeding ones. Again, weeding creates an unfavourable microclimate for pod borer exerted less pod infestation than that of no weeding plots. Hence, it is observed that weeding favours to increase the thrips infestation in the flowers but disfavours the pod borer infestation and the reverse was true in case of no weeding plots. Only weeding increases a significant percentage of yield increase (81.13 to 154.72%) over no weeding but could not give reasonable benefit because of a higher cost of hand weeding. No weeding with three times spraying of imidacloprid (Imitaf 20 SL@ 0.5 ml/l) provided the highest benefit of taka 2.19 followed by one time weeding at 12 DAS. If we developed environment-friendly cost-effective chemical weed management technology that would be very profitable for higher production of summer mungbean.

Knowledge Management: Report/Proceedings