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Cultural and Physiological studies on Alternaria alternata causing Blight of Marigold

Author: Archana, A. M., Lokesha, M. S., Mahesh, Y. S., A. M. Shirol and Ashoka, N.

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Abstract

Cultural and physiological studies on Alternaria alternata were studied at the Laboratory of Department of Plant Pathology, College of Horticulture, Bagalkot during 2018-2019. Marigold ranks first among the loose flowers in India. But, due to the increase in area, the crop is gradually becoming susceptible to many fungal and bacterial diseases mainly leaf blight which, affect the yield of the crop. The Potato Dextrose Agar (PDA) medium was used to maintain the pure culture isolated from infected marigold leaf and identified as Alternaria alternata (Fr.) Keissler. The cultural studies were conducted to know the effect of growth and sporulation in different media among them A. Alternata gave maximum mycelial growth (86.67) on the 8th day after incubation in a Potato dextrose agar (PDA) medium with better sporulation. Among liquid media, potato dextrose broth was observed most supportive for its growth. The various response of A. Alternata to different levels of temperature and pH showed

Keywords

Culture, morphology, physiology, Alternaria alternata.

Conclusion

In the present study, Alternaria alternata was isolated from the infected marigold crop. Twelve different media were used to observe the growth and sporulation. Potato dextrose media was found best for growth and sporulation. Maximum growth was found at 6.0 pH of media followed by 7.0 and temperature of 30 °C was found congenial for the pathogen growth. The present study will be helpful in the research being carried out by different workers studying this pathogen to understand its congenial condition for host-pathogen interaction.

References

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How to cite this article

Archana, A. M., Lokesha, M. S., Mahesh, Y. S., A. M. Shirol and Ashoka, N. (2022). Cultural and Physiological studies on Alternaria alternata causing blight of marigold. Biological Forum – An International Journal, 14(1): 1269-1273.