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International Journal of
Biology Research
ARCHIVES
VOL. 3, ISSUE 2 (2018)
Host preference and population dynamics of a major pest, Leptocorisa acuta (Thunb.), for their ecological management
Authors
Souren Dutta, Nayan Roy
Abstract
Rice, Oryza sativa L., is the most important staple food crop for more than two thirds of the population of India and more than 65 per cent of the world population. In this modern era with increasing human population there is a need to increase rice production per unit of land through sustainable strategies. In fact, a number of insect pests are reported to ravage the rice fields throughout the world. Today spraying of different broad spectrum synthetic chemical insecticides or few botanicals are the general practices for the control of such pests in the field without considering their sustainability. So, there is a need to control or manage populations of these pests through ecologically, environmentally and economically sustainable strategies. Life table study is a central theme in ecological research to understand the temporal and spatial patterns in population dynamics of any pest for their sustainable management. Host phytoconstituents regulate the growth and survival of herbivorous insects. The host preference test of rice bug, Leptocorisa acuta (Thunb.) in relation with phytochemical regime of rice (R) [Oryza sativa L.; Family: Poaceae, cv. Jamini (IET-12133)] and non-rice weeds (NRW) [Cyperus rotundus, Family: Cyperaceae (NRW1) and Echinochloa colona, Family: Poaceae (NRW2)] were conducted in the laboratory condition. The different population growth parameters like higher intrinsic (rm) and finite (λ) rate of increase of L. acuta on R and NRW (NRW1 and NRW2) were significantly differed (P< 0.005) from each other and can be arranged as NRW2>R>NRW1 and reverse (NRW2<R<NRW1) in generation time (Tc) and doubling time (DT). These differences were due to better nutritional quality relative to anti-nutritional factors in the respective host plants. Thus, by knowing the host quality one can NRW2 host as a trap plant around the rice agro ecosystem to make sustainable ecological management of this pest (L. acuta) population or other such pests in near future.
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Pages:31-39
How to cite this article:
Souren Dutta, Nayan Roy "Host preference and population dynamics of a major pest, <em>Leptocorisa acuta </em>(Thunb.), for their ecological management". International Journal of Biology Research, Vol 3, Issue 2, 2018, Pages 31-39
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