Seasonal Incidence of Insect Pests on Kalanamak Rice in Relation to Weather Parameters
Yuvraj B. Patil
Department of Entomology, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
Shweta Patel *
Crop Research Station, Masodha, Acharya Narendra Deva University of Agriculture and Technology, Ayodhya, Uttar Pradesh, India.
Umesh Chandra
College of Agriculture, Colonel Ganj, Gonda, 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, Azamgarh, Uttar Pradesh, India.
Manish K. Maurya
College of Agriculture, Colonelganj, Gonda, Acharya Narendra Deva University of Agriculture and Technology, Gonda, Uttar Pradesh, India.
Sanjay Kumar
Crop Research Station, Masodha, Acharya Narendra Deva University of Agriculture and Technology, Ayodhya, Uttar Pradesh, India.
K. K. Maurya
Department of Agricultural Statistics, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, Uttar Pradesh, India.
*Author to whom correspondence should be addressed.
Abstract
Kalanamak rice is a traditional aromatic rice variety of eastern Uttar Pradesh whose cultivation is affected by several insect pests. A field experiment was conducted during Kharif 2024 at the Crop Research Station, Masodha, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya, to assess the seasonal incidence of major insect pests on Pusa Narendra Kalanamak-1 and their relationships with weather parameters. Six pest groups were recorded: yellow stem borer (Scirpophaga incertulas), leaf folder (Cnaphalocrocis medinalis), gundhi bug (Leptocorisa acuta), green leafhopper (Nephotettix virescens), brown planthopper (Nilaparvata lugens), and grasshoppers. Yellow stem borer dead-heart incidence peaked at 9.44% in the 39th standard meteorological week (SMW), whereas white-ear-head incidence reached 8.44% in the 44th SMW. Leaf folder reached its maximum in the 38th SMW, green leafhopper in the 37th SMW, grasshopper in the 39th SMW, gundhi bug in the 40th SMW, and brown planthopper in the 44th SMW. Correlation analysis showed strong negative associations of white-ear-head incidence with minimum temperature (r = −0.907) and rainfall (r = −0.817), while green leafhopper incidence was negatively correlated with maximum temperature (r = −0.484). Most other weather–pest correlations were non-significant. The findings demonstrate pest-specific seasonal patterns and support weather-informed field surveillance and timely pest-management interventions in Kalanamak rice.
Keywords: Kalanamak rice, yellow stem borer, leaf folder, gundhi bug, population dynamics, weather parameters