Population Dynamics of Aphid, Hyadaphis coriandri Das Infesting Fennel with Relation to Biotic and Abiotic Factors

Author: Heera Kumari, S.K. Khinchi, Sheetal Kumawat, Pappu Lal Dalal, Suman Choudhary and Arti Sharma

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Abstract

The present investigation on “Population dynamics of aphid, Hyadaphis coriandri Das infesting fennel with relation to biotic and abiotic factors” was carried out under field conditions at Research Farm, Department of Agronomy, College of Agriculture, Sri Karan Narendra Agricultural University, Jobner during Rabi season, 2021-22. The presence of fennel aphid was observed from the 3rd Standard Meteorological Week (SMW) and persisted until the 13th SMW, with its peak occurring during the 9thSMW in fennel crops. At the same time, higher population of Coccinella septempunctata was noted between the 4th SMW and 9th SMW, displaying a notably strong positive correlation with the aphid population in the fennel crop. The aphid population exhibited a significant correlation with maximum temperature, while minimum temperature, average relative humidity, and rainfall displayed insignificant effects. None of the weather parameters showed a significant correlation with C. septempunctata.

Keywords

Fennel, aphid, Hyadaphis coriandri, Population dynamics, Coccinella septempunctata

Conclusion

The presence of H. coriandri commenced in the third week of January (3rd SMW) and persisted until the fourth week of March (13thSMW), with numbers ranging from 0.20 to 58 aphids per plant. The highest population of H. coriandri (58 aphids per plant) was noted during the fourth week of February (9thSMW). There was a relatively higher population of coccinellid predators (ranging from 1.4 to 8.24 coccinellids per plant) observed from the fourth week of January to the third week of March, peaking during the fourth week of February. Analysis of the correlation between H. coriandri and C. septumpuctata demonstrated a significant positive relationship. However, the variables of maximum and minimum temperatures, average relative humidity, and rainfall did not exert a significant impact on C. septumpuctata. Among these variables, only maximum temperature significantly influenced the population of H. coriandri, while minimum temperature, average relative humidity, and rainfall did not show significant effects on its population.

References

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How to cite this article

Heera Kumari, S.K. Khinchi, Sheetal Kumawat, Pappu Lal Dalal, Suman Choudhary and Arti Sharma (2023). Population Dynamics of Aphid, Hyadaphis coriandri Das Infesting Fennel with Relation to Biotic and Abiotic Factors. Biological Forum – An International Journal, 15(10): 1086-1089.