Efficacy and Economics of Different Insecticides against Yellow Stem Borer, Scirpophaga incertulas (Walker), in Kalanamak Rice
Yuvraj B. Patil *
College of Agriculture, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
Shweta Patel *
Crop Research Station, Masodha, Ayodhya, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
Vijay Laxmi Rai
College of Agriculture, Kotwa, Azamgarh, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
S. K. S. Rajpoot
Zonal Agriculture Sub-Station, Badibagh, Gazipur, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
S. N. Rahul
College of Agriculture, Kotwa, Azamgarh, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
Manish K. Maurya
College of Agriculture, Colonel Ganj, Gonda, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
Sanjay Kumar
Crop Research Station, Masodha, Ayodhya, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
*Author to whom correspondence should be addressed.
Abstract
Yellow stem borer (Scirpophaga incertulas Walker) causes vegetative-stage injury in rice, including in Kalanamak varieties grown in eastern Uttar Pradesh. A field experiment was conducted during the 2024 kharif season at the Crop Research Station, Masodha, Ayodhya, to compare seven insecticidal formulations with an untreated control in Pusa Narendra Kalanamak-1 rice. Treatments were arranged in a randomised block design with three replications, and dead-heart incidence was recorded before and at 5, 10 and 15 days after each of two sprays. Across the three post-spray observations, chlorantraniliprole 18.5% SC had the lowest arithmetic mean dead-heart incidence after the first (3.24%) and second (3.40%) sprays, compared with 9.07% and 7.33%, respectively, in untreated plots. At 15 days after the second spray, the corresponding values were 2.97% and 7.78%. Chlorantraniliprole-treated plots also had the highest reported grain yield (41.50 q ha⁻¹), compared with 24.10 q ha⁻¹ in the control, and the highest calculated incremental net-return-to-treatment-cost ratio (15.57:1) at the stated grain price and treatment expenditures. These treatment-level summaries indicate favourable performance under the conditions studied; dose documentation, statistical inference and broader environmental outcomes were not established by the available summaries.
Keywords: Aromatic rice, chlorantraniliprole, dead heart, incremental net return, insecticide efficacy, Scirpophaga incertulas