Population Dynamics of Shoot and Fruit Borer, Leucinodes orbonalis Guenee infesting Brinjal and its Natural Enemy, Trathala flavo-orbitalis in context with Weather Parameters at Bhubaneswar, Odisha

Author: P.K. Prusti, M.K. Tripathy, R. Mohapatra, P. Tripathy and R. Bhola

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Abstract

A field experiment was carried out in the research farm of Department of Entomology, OUAT, Bhubaneswar during 2021-22 to study the population fluctuation of shoot and fruit borer of brinjal and its natural enemy Trathala flavo-orbitalis. The results revealed that the infestation of shoot and fruit borer recorded two distinct peaks in different growing seasons of study period, 2021-22. During summer 2021,rabi 2021-22 and kharif 2022, the peaks of larval intensity were recorded on18th (8.73 larvae/Plant/week) and 24th (7.17 larvae/Plant/week) SMW, 12th (5.54 larvae/Plant/week) and 17th (6.86 larvae/Plant/week) SMW and 36th (7.72 larvae/Plant/week) and 42nd (6.48 larvae/Plant/week) SMW respectively. All the temperature factors (maximum, minimum and average) were found to be positively correlated with the population density and infestation of this pest during the three seasons of study period. Morning relative humidity was found to have a negative influence. During summer 2021, wind velocity (Correlation coefficient=0.764) and pan evaporation (r=0.663) showed significant positive correlation with pheromone trap catch. The parasitisation of natural enemy, T.flavo-orbitalis had significant positive correlation with all temperature factors during rabi season and non- significant positive correlation during summer and kharif seasons. Also, during summer, morning relative humidity showed significant negative correlation (r=-0.594) with parasitisation whereas afternoon relative humidity had positive significant correlation (r=0.668) during rabi season. Pan evaporation was found to be positively correlated (0.680) during rabi, 2021-22. Among the studied weather parameters, temperature, relative humidity and pan evaporation had maximum contribution towards the population of brinjal shoot and fruit borer.

Keywords

Brinjal Shoot and Fruit borer, Bhubaneswar, Weather parameters, Population dynamics, Trathala flavo-orbitalis

Conclusion

The correlation studies revealed that the damage by Leucinodes orbonalis showed positive correlation with maximum temperature, minimum temperature and average temperature while negative correlation with morning relative humidity. The wind velocity and evaporation showed positive association whereas rainfall has non-significant impact on incidence of shoot and fruit borer of brinjal. As concerned to correlation of weather parameters with parasitisation by Trathala flavo-orbitalis, all the temperature factors had positive correlation. The coefficient of determination for fruit damage percent (weight basis) was found to be 0.456 to 0.958 which indicates that the climatic factors together were able to explain the impact of 45.60 to 95.80 % in different seasons of study period, 2021-22.

References

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How to cite this article

P.K. Prusti, M.K. Tripathy, R. Mohapatra, P. Tripathy and R. Bhola (2023). Population Dynamics of Shoot and Fruit Borer, Leucinodes orbonalis Guenee infesting Brinjal and its Natural Enemy, Trathala flavo-orbitalis in context with Weather Parameters at Bhubaneswar, Odisha. Biological Forum – An International Journal, 15(10): 1686-1693.