Survey, Host Range Studies and Germplasm Screening Against Early Blight Disease of Potato caused by Alternaria solani

Author: Manjamma D., Prasad P.S., H. Amarananjundeswara, Manjunath Hubballi and Chandrashekhar G.S.

Download PDF

Abstract

Potato (Solanum tuberosum L.) belongs to the family solanaceae is the most important crop among the vegetables. The crop stands prime position in the economy of poor and marginal farmers and plays a vital role in nutritional security by producing more bio-mass per unit area as compared to wheat, rice and maize in a short period of time. An investigation was carried out for roving survey was undertaken during 2018 to estimate the severity of early blight of potato in major potato growing districts of Southern Karnataka viz., Hassan and Chikkamagaluru during kharif and Kolar and Chikkaballapura districts in rabi 2018. The host range studies of solanaceous crops like tomato, capsicum, chilli and brinjal were inoculated artificially with spore suspension of the Alternaria solani. The natural incidence of early blight was recorded on different twenty potato germplasm grown in field conditions at Horticulture Research and Extension Centre, Hassan and artificial inoculation was done in polyhouse condition at College of Horticulture, Bengaluru during 2018-19. The early blight disease severity in potato was ranged between 5.13 to 30.33 per cent in all the districts. The host range studies of solanaceous crops like tomato, capsicum, chilli and brinjal were inoculated artificially with spore suspension of the Alternaria solani. The results indicated that Alternaria solani was effectively act as pathogen and infect all solanaceous crops. Besides, more disease symptoms were found on the tomato crop followed by capsicum and less symptoms were observed on brinjal and chilli. The screening of potato germplasms to find the resistance source against early blight of potato. The results related to both field and polyhouse screening revealed that, among the twenty germplasms screened none of them showed immune response. Only seven genotypes were noticed resistant reaction viz., CP-3352, CP-3377, CP-3376, CP-3318, CP-3337, CP-3322 and CP-3175. Whereas, six genotypes were showed moderately resistant viz., CP-3393, CP-3421, CP-3382, CP-3325, CP-3421 and CP-3210. But, four genotypes were moderately susceptible viz., CP-3420, CP-3083, CP-3415 and CP-3361. Whereas, three genotypes were showed susceptible reaction viz., CP-3395, CP-3112 and CP-3397. However, none of the genotypes were found to be highly susceptible

Keywords

Germplasm, Alternaria solani, Polyhouse, Host range and Screening

Conclusion

A roving survey was carried out to know the status of early blight diseases severity in Southern Karnataka. The severity of early blight was found higher in Mulabagilu taluk with disease severity of 29.92 per cent followed by Kolar (21.60%) and Shidlaghatta (20.52%) of Kolar and Chikkballapura districts, respectively. Host range studies of solanaceous crops revealed that, more and early symptoms were exhibited in tomato plants with maximum PDI of about 8.51 per cent after 7 days of inoculation. Among the twenty genotypes screened, no genotypes were showed immune response to early blight disease. Only seven genotypes indicated resistant reaction viz., CP-3352, CP-3377, CP-3376, CP-3318, CP-3337, CP-3322 and CP-3175. Whereas, three genotypes were showed susceptible reaction viz., CP-3395, CP-3112 and CP-3397 and none of the genotypes were found to be highly susceptible. Hence, some of resistant and moderately resistant germplasms can be exploited in the breeding programme and recommended to the farming community as resistant sources for effective management of early blight disease of potato

References

-

How to cite this article

Manjamma D., Prasad P.S., H. Amarananjundeswara, Manjunath Hubballi and Chandrashekhar G.S. (2024). Survey, Host Range studies and Germplasm Screening Against Early Blight Disease of Potato caused by Alternaria solani. Biological Forum – An International Journal, 16(10): 130-134