Seasonal Incidence of Onion Thrips (Thrips tabaci) and the Abundance of Its Natural Enemies

Author: R.S. Meena, Puneet Kumar and Kritika Sahu

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Abstract

The present study was carried out in the Entomological research field of vegetable Research Farm, Institute of Agricultural Science, BHU Varanasi, during the Rabi season 2021-2022. The occurrence of coccinellids was observed from 50th SMW (1.28 beetle/plant) when maximum temperature, minimum temperature, rainfall, morning relative humidity, evening relative humidity, and wind speed were recorded as 24.6ºC, 8.6ºC, 94%, 44%, and 0.5 km/hr, respectively. The coccinellid population ranged from 0.82 lowest population (4th SMW) to 3.56 highest population (6th SMW) beetles/plant on onion. The correlation between thrips population on onion with evening RH (r=- 0.209) and rainfall (r= 0.229) shows negatively significant and morning RH (r=-0.529) negatively significant whereas, maximum temperature (r= 0.504), wind velocity (r=0.719), sunshine hours (r=0.634) and evaporation (r=0.823) were shown as positively significant

Keywords

Antioxidant, Carbendazim, evaporation etc

Conclusion

Thrips first appeared in the 50th SW, with 4.64 thrip/plant. The population fluctuated and peaked at 24.86 thrips/plant in the 8th SW. The population of ladybird beetle was recorded in 50TH SW with 1.28 beetle per plant. The population fluctuated and peaked at 3.56 beetle/plant in the 6TH SW. The population of Thrips tabaci was negatively correlated with rainfall and evening RH. but positive and non-significant correlated with minimum temperature. However, the thrips population shows a positive and significant correlation with maximum temperature, wind velocity, sunshine hours, and evaporation. The population of ladybird beetle shows a negative significant correlation with maximum and minimum temperature and evaporation. However, negative non-significant correlation with rainfall, wind, and sunshine

References

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How to cite this article

R.S. Meena, Puneet Kumar and Kritika Sahu (2024). Seasonal Incidence of Onion Thrips (Thrips tabaci) and the Abundance of Its Natural Enemies. Biological Forum – An International Journal, 16(3): 88-91