Field Evaluation of Thiamethoxam against Mustard Aphids in Mustard Crop under North Bihar conditions

Author: B. Sujatha, Sanjay Kumar Sahoo and Gouri Shankar Giri

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Abstract

A field trial was conducted at RPCAU, Pusa, Samastipur, Bihar during the Rabi, 2021-22. Seven treatments were assessed over mustard aphid, Lipaphis erysimi Kaltenbach i.e. thiamethoxam 25% WG at different doses at 12.5, 16.67, 25, 37.5, 50 g a.i. per ha, standard check of dimethoate 30% EC at 200 g a.i. per ha and untreated control (water spray). Among the various doses of thiamethoxam sprayed twice at an interval of 10 days on mustard, Brassica juncea L., treatments T5, T4 and T3 were statistically at par in terms of their effectiveness i.e. 5.95, 6.82 and 8.95 no. of L. erysimi/top 10 cm of terminal shoot. It was followed by T6 (13.29), T2 (15.41), and T1 (18.75). The plots treated with thiamethoxam (50 g a.i. per ha) gave highest yield and B:C ratio and it was in line with the results of thiamethoxam 37.5 and 25 g a.i. per ha.

Keywords

Thiamethoxam, mustard, mustard aphids, field bioefficacy

Conclusion

On brief account of the field evaluation carried out, to cope with the rapidly multiplying aphid population, the insecticidal application would reduce the populations drastically over the control plots. Keeping this in view, firstly we have to follow the practices that would reduce the insecticidal application, and the fact that early sowing would reduce mustard aphid population should be kept in mind while planting. Under unavoidable circumstances like late harvesting of the earlier crop, labour unavailability and tillage practices, even though it is sown lately go for recommended rate of insecticidal applications to avoid judicious usage. Although the highest yield, economics, and lowest aphid population were encountered in plots treated by thiamethoxam 25 WG @ 50 g a.i. per ha followed by 37.5 g a.i. per ha and 25 g a.i. per ha. But, keeping in view of the economic and judicious usage of the insecticides, thiamethoxam 25 WG @ 25 g a.i. per ha could be employed in obtaining good seed yields as well as reducing aphid populations.

References

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How to cite this article

B. Sujatha, Sanjay Kumar Sahoo and Gouri Shankar Giri (2023). Field Evaluation of Thiamethoxam against Mustard Aphids in Mustard Crop under North Bihar conditions. Biological Forum – An International Journal, 15(1): 336-340.