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V. Ratnakar

Publications (8)

Assessment of Insecticide Resistance, Biological Characteristics, and Detoxification Enzyme Activity in Rice Brown Planthopper (Nilaparvata lugens) from the Gangavathi Region, India

V. Ratnakar, V. Jhansi Lakshmi, Y. Swathi, Satendra K. Mangrauthia, S. Srinivasnaik & C. Srinivas · Journal of Advances in Biology & Biotechnology · 2026

The brown planthopper, Nilaparvata lugens (Stål), is a major insect pest of rice, and its management is increasingly constrained by insecticide resistance. This study assessed insecticide susceptibility, detoxification enzyme activity, and biological characteristics in a Gangavat...

Open access Research Article 10.9734/jabb/2026/v29i84268

Morphometrics of Brown Planthopper, Nilaparvata lugens (Stål) Populations Collected from Different Locations of India

V. Ratnakar, V. Jhansi Lakshmi, C. Srinivas, R. Jagadeeshwar & Satendra K Mangrauthia · Journal of Experimental Agriculture International · 2025

Morphometrics -the quantitative analysis of form-serves as a powerful tool in this context. It involves precise measurements of various body parts and is widely used in systematics to study morphogenesis, population structure, and the effects of environmental stress on organisms,...

Open access Research Article 10.9734/jeai/2025/v47i73619

An on Farm Trail and Front Line Demonstration on Management of Pod Borer Complex in Pigeon Pea

V. Ratnakar, G. Veeranna, B. Shiva, K. Anand Singh, P. Jagan Mohan Rao & P. Raghurami Reddy · International Research Journal of Pure and Applied Chemistry · 2020

The study was undertaken on management of pod borer complex in redgram, Cajanus cajan by erecting of pheromone traps for monitoring of Helicoverpa armigera @ 4/ac. Spraying azardiractin 1500 ppm @ 5ml/ l, two sprays with 10 days interval during flower initiation stage. Spaying of...

Open access Research Article 10.9734/irjpac/2020/v21i2230296

Assessment of Integrated Pest Management Modules against Fall Army Worm and Its Economic Impact in Maize

V. Lakshmi Narayanamma, V. Ratnakar, M. Ram Prasad, B. Shiva, R. Vishwatej, G. Veeranna & R. Uma Reddy · International Journal of Environment and Climate Change · 2023

Aim: The present study was undertaken to assess the IPM modules and their economic impact against Fall Armyworm in maize through on farm trail (OFT). Place and Duration of Study: The present study was carried out in the farmers’ fields of Bhadradri Kothagudem district of Telangan...

Open access Research Article 10.9734/ijecc/2023/v13i102949

Emerging Invasive Agricultural Insect Pests in India: Occurrence, Economic Impact, and Sustainable Management Strategies

S. Srinivasnaik, S. Omprakash, V. Ratnakar, Y. Swathi & S. Malathi · Journal of Advances in Biology & Biotechnology · 2026

The introduction and establishment of invasive insect pests have become an increasing concern for Indian agriculture because of expanding global trade, movement of planting materials, changing climatic conditions, and intensified cropping systems. India’s diverse agro-climatic re...

Open access Research Article 10.9734/jabb/2026/v29i84253

Screening of Rice Germplasm Accessions for Resistance to Brown Plant Hopper (Nilaparvata lugens Stal.)

D Harshitha, T. Srikanth, V. Ratnakar & P. Madhukar · Journal of Experimental Agriculture International · 2024

An investigation was executed with twenty-nine rice germplasm accessions to identify the source of resistance to Brown planthopper, Nilaparvata lugens (Stal.) during Rabi 2024 at RARS, Jagtial under glasshouse conditions. These rice germplasm accessions were screened following th...

Open access Research Article 10.9734/jeai/2024/v46i82721

Genetic Variability, Heritability, and Genetic Advance for Yield and Milling Quality Traits in Rice (Oryza sativa L.) Germplasm

Muneeb Ahmed Naushad, K. Rajendra Prasad, B. Srinivas, V. Ratnakar & Y. Hari · International Journal of Plant & Soil Science · 2026

Genetic variability is the foundation of effective selection in crop improvement. Fifty rice germplasm lines were evaluated during the kharif season of 2025 at the Regional Agricultural Research Station, Polasa, Jagtial, Telangana, India, using a randomised block design with two...

Open access Research Article 10.9734/ijpss/2026/v38i86221

Field Screening of Sesame Genotypes against Leaf Webber and Capsule Borer (Antigastra catalaunalis Dup.) and Gall Fly (Aspondylia sesami Felt)

Y. Swathi, S. Omprakasah, N. Balram, B. Padmaja & V. Ratnakar · Journal of Experimental Agriculture International · 2025

Field screening of sesame (Sesame indicum L.) germplasm with forty three genotypes including susceptible and resistant checks were screened to know about reaction pattern against the leaf webber and capsule borer (Antigastra catalaunalis Dup) and gall fly (Aspondylia sesami Felt)...

Open access Research Article 10.9734/jeai/2025/v47i123928