Study the Weather Parameters Affecting Amplitude Fluctuation in the Population Dynamics of Ocimum Leaf Folder, Orphanostigma abruptelis on Sweet Basil in Bihar

Author: Amit Kumar, Manoj Kumar and Heenashree Mansion

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Abstract

The present investigation was studied in Kharif 2021 in the field of Herbal Garden, Hi-tech unit of Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur) Bihar. In the course of research, the study of seasonal incidence of ocimum leaf folder, O. abruptalis on sweet basil revealed that the larval population exhibited significant a non-significant relationship with Standard Meteorological Week (SMW). The incidence of ocimum leaf folder were observed from 39th SMW which was (2.33 larvae/ 5 plants) while the peak population of this pest was recorded at 47th SMW (11.00 larvae/ 5 plants) afterwards the population of leaf folder started gradually decreasing by maturity of the sweet basil crop. The correlation studies with leaf folder population in relation with weather parameters where larva of ocimum leaf folder were negatively non- significant correlated (-0.14NS) with maximum temperature whereas positively non-significant correlated (0.53NS) with minimum temperature, while positive and non-significant correlation (0.48NS) with morning relative humidity whereas negatively significant correlation (-0.59*) with evening relative humidity and non-significant & negatively correlated (-0.39NS) with rainfall. This study provides basic knowledge about the incidence and damage caused by this pest, and its behavior towards abiotic factors.

Keywords

Sweet basil, Leaf folder, Orphanostigma abruptelis. Population dynamics

Conclusion

On the basis of present investigation conducted on sweet basil, it may be concluded that the seasonal incidence of ocimum leaf folder was gradually increasing and it’s reached to peak which was recorded (11.00 larvae/5 plants) in 47th SMW. The data on correlation between the mean population of leaf folder and weather factors were calculated by considering maximum temperature (°C), minimum temperature (°C), morning and evening relative humidity, respectively which observed the leaf folder were showed (-0.14NS), (0.53NS), (0.48NS), (-59*) negatively non-significant with maximum temperature and positively non-significant correlation with minimum temperature while positively non-significant and negatively significant correlation with morning and evening relative humidity, respectively. The correlation between rainfall (mm) and mean population of leaf folder was negatively non-significant(-0.39NS). Correlation coefficient of leaf folder with weather factors showed 64 % variation (R2= 0.64).

References

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How to cite this article

Amit Kumar, Manoj Kumar and Heenashree Mansion (2023). Study the Weather Parameters Affecting Amplitude Fluctuation in the Population Dynamics of Ocimum Leaf Folder, Orphanostigma abruptelis on Sweet Basil in Bihar. Biological Forum – An International Journal, 15(9): 74-79.