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Journal of Entomology and Zoology Studies
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P-ISSN: 2349-6800, E-ISSN: 2320-7078

Journal of Entomology and Zoology Studies

2017, Vol. 5, Issue 6
Observation on the impact of environmental parameters on rice yellow stem borer, Scirpophaga incertulas (Walker) and its natural enemies at Murshidabad, West Bengal, India

Israrul Hoque Mondal, Kaushik Chakraborty

The yellow stem borer (YSB) (walker) is one of the most serious insect pests infesting field rice crop. The relative abundance of different natural enemies in relation to the interaction with the environmental factors and also in relation to the incidence of YSB was studied in view of the three growth stages of kharif rice at Murshidabad, West Bengal, India, during 2016. The incidence of natural enemies was found to vary in relation to the YSB incidence. Collectively, 262.75 lady bird beetles (LBB) ware counted. Numerically Long jawed spider ranked second with 97.30 individuals. This was followed by wolf spider (32.53), lynx spider: LS (19.87), carabid beetle (38.44), damsel fly (33.67), dragon fly (15.28) in descending order. Least was noted for wasp (14.70) population. All of the insect natural enemies had very steady correlation with YSB population. Rank order of relative abundance of natural enemies in kharif rice field. Lady bird beetles (51.06%)> Long jawed spider (18.91%) > Carabid beetle (7.47%)> Damsel fly (6.54%)>Wolf spider (6.32%)>Lynx spider (3.86%) > Dragon fly (2.96%) > Wasps (2.85%). At rice seedling growth stage, incidence of lady bird beetle population (14.21individuals/hill) was lowest. At tillering growth stage, maximum population of LBB population (137.55 individuals/ 5 hill) was noted. Occurrence of wasp populations is lowest in heading stage (2.10 individuals/ 5 hill).YSB population first appeared at 30-35 days after seedling transplanting (DAS). Maximum incidence of YSB was observed at 44 SMW. First trace of dead heart (DH) was noted from 31 SMW. Incidence of DH gradually increases attaining the maximum at about 39 SMW. After 39 SMW no incidence of white head (WH) was noted. Numerically DH was abundant at about 39 SMW. The maximum incidence WH was counted at about 44 SMW. Formation of DH and WH are significantly and positively related to the plant growth stages. Correlation coefficient between different weather parameters and the incidence of DH and WH revealed that, Tvag recoded significant negative correlation with DH (%) and WH (%).
Pages : 1656-1663 | 937 Views | 197 Downloads


Journal of Entomology and Zoology Studies Journal of Entomology and Zoology Studies
How to cite this article:
Israrul Hoque Mondal, Kaushik Chakraborty. Observation on the impact of environmental parameters on rice yellow stem borer, Scirpophaga incertulas (Walker) and its natural enemies at Murshidabad, West Bengal, India. J Entomol Zool Stud 2017;5(6):1656-1663.

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