Determination of Economic Injury Level of Mustard Aphid Lipaphis erysimi (Kalt.) on Mustard

The present study was conducted during rabi, 2021-22 and 2022-23 at the Regional Agricultural Research Station, Polasa, Jagtial to determine the EIL of mustard aphid on mustard crop. The results related to the seed yield of mustard under differential load of aphids and the calculation of EIL showed that with increasing aphid infestation levels, the seed yield of mustard decreased gradually. The highest seed yield of 3.61 q/ha was obtained in the control treatment (no aphids were released) during 2021-22. Similarly highest seed yield of 3.88 quintals per hectare was obtained in the control treatment (no aphids were released) during 2022-23. The economic injury level of L. erysimi was worked out to be 42 and 38 aphids per 10 cm central apical shoot during 2021-22 and 2022-23, respectively.