Efficacy of Nutrient Supplementation in Managing Groundnut Late Leaf Spot Disease Incidence through Root Feeding

Author: Vineela D.R.S., Patibanda A.K., Prasanna Kumari V., Sreekanth B. and Nafeez Umar S.K.

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Abstract

Groundnut late leaf spot disease, being an endemic foliar disease requires constant vigilance as well as frequent fungicide applications in order to sustain production. Excess fungicide usage owing to drift losses adds chemical load to environment emphasizing eco-friendly management strategy. Mineral nutrition as an effective alternative disease management strategy had wide scope but it is highly specific to plant as well as pathogen. In order to learn nutrients role in groundnut late leaf spot disease management, four nutrients K, S, Mg and Cu were selected and were studied by hydroponic sand culture using artificial inoculation with conidial suspension (@ 1 × 106 conidia/ ml) at 20 DAS and 35 DAS. 100 per cent Hoagland and Arnon (1950) nutrient solution was taken as base (control), twice or thrice the strength of respective nutrient over 100 per cent nutrient solution as treatments and were compared with chemical treated seeds sown in 100 per cent nutrient solution (tebuconazole 0.1%) as fungicidal check. CuSO4 at thrice strength resulted in phyto-toxicity and hence deleted as treatment. CuSO4 twice the strength had similar affect as fungicidal check (6.33 and 9.67 days) in delaying incubation (6.33 days) and latent periods (8.67 days) while KNO¬3 thrice the strength, MgSO4 thrice the strength has similar effect as fungicidal check (2.00/ leaf and 1.00 mm) with respect to lesion number (3.00/leaf) and lesion diameter (1.00 mm) resulting in lesser AUDPC values as fungicidal check compared to absolute control (4 days incubation period, 7.33 days latent period, 10.33 lesions/leaf, 2.50 mm diameter). SOD and POD enzyme activities showed similar trend corresponding to incubation period and latent period when comparing antioxidant enzyme activity of nutrient supplemented treatments with fungicidal check indicating that adequate amount of nutrient supplementation to plants offers tolerance to fungal infection through altered antioxidant enzyme activity.

Keywords

Anti oxidant enzyme, Groundnut, Late leaf spot disease, Mineral nutrition, POD, SOD

Conclusion

Fungicidal check, KNO3 thrice the strength, MgSO4 thrice the strength and CuSO4 twice the strength showed similar range of per cent reduction of late leaf spot lesion number over control and lesser AUDPC values compared to control. SOD and POD enzyme activities showed similar trend corresponding to incubation period and latent period when comparing antioxidant enzyme activity of nutrient supplemented treatments with fungicidal check indicating that adequate amount of nutrient supplementation to plants offers tolerance to fungal infection through altered antioxidant enzyme activity.

References

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How to cite this article

Vineela D.R.S., Patibanda A.K., Prasanna Kumari V., Sreekanth B. and Nafeez Umar S.K. (2023). Efficacy of Nutrient Supplementation in Managing Groundnut Late Leaf Spot Disease Incidence through Root Feeding. Biological Forum – An International Journal, 15(9): 123-130.