Journal of Environmental Biology

Seasonal variation in population and biochemical contents of brown planthopper, Nilaparvata lugens (Stål)

S. Narayana¹, S. Chander²*, S. Doddachowdappa³, S. Sabtharishi³ and P. Divekar⁴

¹Department of Entomology and Agricultural Zoology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221 005, India

²ICAR-National Research Centre for Integrated Pest Management, IARI, New Delhi-110 012, India

³Division of Entomology, ICAR-Indian Agricultural Research Institute, New Delhi-110 012, India

⁴Division of crop protection, ICAR-Indian Institute Vegetable Research, Varanasi-221 305, India

*Corresponding Author Email : schanderthakur@gmail.com

Received: 17.05.2021                                                                                Revised: 12.08.2021                                                                   Accepted: 31.08.2021

Abstract

Aim: The present study was undertaken on population dynamics and estimation of protein, water-soluble carbohydrates and glycogen contents in the brown planthopper, Nilaparvata lugens to explore their migratory behaviour.

Methodology: Brown planthopper populations were monitored and collected using sweep nets from 23^rd standard meteorological week (SMW) to 47^th SMW during 2017 and 2018 rainy seasons to understand population dynamics of the pest. The protein, water-soluble carbohydrates and glycogen contents were estimated from the pest samples collected during 36^th to 44^th SMW in 2017 and 2018 rainy seasons.

Results: Brown planthopper population were not observed in rice farm during 23rd SMW to 28^th SMW during two years of study. However, macropterous form of the pest first appeared in the farm during 29^th SMW and peaked during 43^rd SMW. Thereafter, population declined and disappeared after 47^th SMW during both the years. Water-soluble carbohydrates and glycogen contents varied significantly different weeks which remained low during 36^th-39^th SMW, however, increased gradually towards the end of the rainy season 2017 and 2018. On the other hand, protein content significantly varied among different weeks unlike the trend of water-soluble carbohydrates and glycogen.

Interpretation: The study revealed the absence of brown plant hopper during summer season preceding rainy season, and the accumulation of bio-chemical compounds towards the end of rainy season under Delhi environment is perhaps suggestive of migration of the pest from unknown areas during rainy season to Delhi and likely preparedness of the pest for emigration to safer areas from Delhi, respectively.       

Key words: Brown planthopper, Glycogen, Macropterous, Migration, Protein, Water-soluble carbohydrates

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