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Influence of Inoculum Density of Alternaria brassicae on Development of Alternaria leaf Spot in Cauliflower

Author: Mummineni Sunitha and P.K. Jha

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Abstract

Cauliflower belongs to the family Brassicaceae and is one of the most important winter vegetable after cabbage in terms of area and production across the globe. Alternaria leaf spot is the most destructive disease of cauliflower crop at vegetable curd stage and seed setting stage. It has been attributed to cause 30-50% losses and in most severe cases, the losses in yield may reach up to 98% in seed crop. The pathogen Alternaria brassicae was found to produce typical symptoms of the disease as small, irregular brown spots with concentric rings, also surrounded by yellow chlorotic halo. Severely affected seedlings showed dark brown spots with damping off symptoms. During the present investigation, different inoculum levels of the pathogen- Alternaria brassicae were evaluated to assess their effect on development of Alternaria leaf spot disease on cauliflower. The lowest Percent Disease Index (7.41%) was noticed with 5g of inoculum load whereas 40g of inoculum load caused maximum disease development with Percent Disease Index (50.81%).

Keywords

Alternaria brassicae, Cauliflower, Disease severity, Inoculum load, Percent Disease Index

Conclusion

The current research finding showed the effect of various inoculum level of the Alternaria brassicae on the development of Alternaria leaf spot on cauliflower. The disease development was markedly influenced by the concentration of inoculum as evident from increasing intensity of disease with increase in the inoculum load. Soil application of 40g inoculum of pathogen caused maximum disease development (50.81%) under pot condition. Thus, inoculum level largely determine the quantum of disease development. Thus, the present finding will be helpful in predicting the disease development based on availability of inoculum level, thereby deciding the management strategy to prevent the disease development.

References

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How to cite this article

Mummineni Sunitha and P.K. Jha (2023). Influence of Inoculum Density of Alternaria brassicae on Development of Alternaria leaf Spot in Cauliflower. Biological Forum – An International Journal, 15(9): 588-591.