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Forecasting of Lipaphis erysimi on oilseed Brassicas in India—a case study |
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| Authors: | C Chattopadhyay R Agrawal Amrender Kumar YP Singh SK Roy SA Khan LM Bhar NVK Chakravarthy A Srivastava BS Patel B Srivastava CP Singh SC Mehta |
| Institution: | aNational Research Centre on Rapeseed-Mustard (ICAR), Sewar, Bharatpur 321303, India bIndian Agricultural Statistics Research Institute (ICAR), New Delhi 110012, India cPulses and Oilseeds Research Station, Ranibagan, Berhampur 742101, WB, India dBidhan Chandra Krishi Viswavidyalaya, Mohanpur 741252, WB, India eIndian Agricultural Research Institute (ICAR), New Delhi 110012, India fOilseeds Research Station, C.S.K. Himachal Pradesh Krishi Viswavidyalaya, Kangra 176001, HP, India gGujarat Agricultural University, S.K. Nagar 385506, Gujarat, India hAgricultural Research Station, Rajasthan Agricultural University, Sriganganagar 335001, Rajasthan, India iG.B. Pant University of Agriculture and Technology, Pantnagar 263145, Uttaranchal, India |
| Abstract: | Experiments at Bharatpur, Pantnagar, Berhampur, Mohanpur, New Delhi, S.K. Nagar, Kangra and Sriganganagar, India were sown with oilseed Brassica cultivars Varuna and an important cultivar for the area on 10 dates at weekly intervals. Data of experiments conducted previously at Hisar and Ludhiana as available in reports were also used for the study. Mustard aphid (Lipaphis erysimi) appearance on inflorescences of the plants was positively correlated to a maximum temperature between 20–29 °C in the preceding week and also to a morning relative humidity (RH) >92% and daily mean RH of >75%. Long hours of leaf wetness and minimum temperature >5 °C also favoured aphid infestation. Regional and cultivar specific models were developed to predict the crop age at which the mustard aphid first appears on the crop, the peak number of aphids and the crop age at peak number at least 1 week ahead of first appearance of the pest on the crop. These will allow growers to apply insecticides in a more timely and effective manner. Here we report only the models that were found effective based on validation in the 2 years. |
| Keywords: | Lipaphis erysimi Brassica Weather Prediction models Forecast Crop age India |
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