Assessing the Effectiveness of New Fungicides Against Potato Late Blight Disease (Phytophthora Infestans)

Year : 2026 | Volume : 15 | Issue : 01 | Page : 28 38
    By

    H Rahman,

  • A Akter,

  • M M Rahman,

  • M M Islam,

  • R Momotaz,

  • T H Tabassum,

  • M Nazneen,

  • Salma Sarker,

Abstract

An experiment was conducted in the field of the Plant Pathology Division, Regional Agricultural Research Station (RARS), Bangladesh Agricultural Research Institute (BARI), Jamalpur, Bangladesh during the rabi season of 2024–2025 to determine the appropriate chemical fungicide for controlling late blight disease of potato. The evaluation included twenty-five new fungicides approved by the Pesticide Technical Advisory Committee (PTAC), Bangladesh, along with a standard control (Ridomil Gold MZ 68 WG) and an untreated control under natural inoculum pressure. The efficacy of the new fungicides ranged from 9.74–98.82%, where Pimazelin 72 WP fungicide (T₂) showed the lowest efficacy, while the highest efficacy was observed with Parizeb 80 WP fungicide (T₁₂), followed by Ninja 56 SC (T₁₀) (97.37%), Zam Gold 50 WP (T₁₁) (96.06%), Mix-Salin 72 WP (T₂₁) (92.51%), and Xtramil 720 WP (T₉) (90.82%), respectively. More than 95% disease suppression was observed with sprays of Ninja 56 SC (T₁₀), Zam Gold 50 WP (T₁₁), and Oracol 70 WP (T₁₂). On the other hand, Xtramil 720 WP (T₉) and Mix-Salin 72 WP (T₂₁) suppressed the disease by 90.82% and 92.51%, respectively. Over 80% disease suppression was achieved with the application of Dynil 70 WDG (T₁₄), Xtramil 720 WP (T₁₅), Xtramil 720 WP (T₁₆), and Akita 75 WP (T₁₉). Among the fungicides, Ninja 56 SC (T₁₀), Zam Gold 50 WP (T₁₁), and Oracol 70 WP (T₁₂) were the most effective in managing late blight disease of potato, while Amagold 72 WP (T₇), Xtramil 720 WP (T₉), Ninja 56 SC (T₁₀), and Akita 75 WP (T₁₉) produced higher tuber yields (>20 t/ha). A correlation analysis among the parameters revealed a strong positive association between disease severity (%) and disease occurrence (%). The efficacy of new fungicides (%), average individual tuber weight (g), cutworm-infested tubers (%), scab-infected tubers (%), and tuber yield (t/ha) were all negatively correlated with disease incidence (%). Thus, lower tuber yield was obtained when late blight disease severely affected potato crops.

Keywords: Correlation, disease incidence, disease severity, efficacy of new fungicide, Late blight disease, phytophthora infestans, potato, yield (t/ha)

[This article belongs to Research & Reviews : Journal of Agricultural Science and Technology ]

How to cite this article:
H Rahman, A Akter, M M Rahman, M M Islam, R Momotaz, T H Tabassum, M Nazneen, Salma Sarker. Assessing the Effectiveness of New Fungicides Against Potato Late Blight Disease (Phytophthora Infestans). Research & Reviews : Journal of Agricultural Science and Technology. 2026; 15(01):28-38.
How to cite this URL:
H Rahman, A Akter, M M Rahman, M M Islam, R Momotaz, T H Tabassum, M Nazneen, Salma Sarker. Assessing the Effectiveness of New Fungicides Against Potato Late Blight Disease (Phytophthora Infestans). Research & Reviews : Journal of Agricultural Science and Technology. 2026; 15(01):28-38. Available from: https://journals.stmjournals.com/rrjoast/article=2026/view=236591


References

1. Lutaladio NB, Castaldi L. Potato: the hidden treasure. J Food Compos Anal. 2009;22(6):491–493.
2. Wellman FL. Neotropical phytopathology problems. In: Wellman FL, editor. Tropical American Plant Disease. 1st ed. New Jersey (USA): Scarecrow Press; 1972. p. 1–982.
3. Majeed A, Chaudhry Z, Muhammad Z. Changes in foliar glycoalkaloids levels of potato (Solanum tuberosum) triggered by late blight disease severity. Int J Agric Biol. 2014;16:609–613.
4. R Core Team. R: A language and environment for statistical computing. Vienna (Austria): R Foundation for Statistical Computing; 2025.
5. Rahman MM, Dey TK, Ali MA, Khalequzzaman KM, Hussain MA. Control of late blight disease of potato by using new fungicides. Int J Sustain Crop Prod. 2008;3(2):10–15.
6. Reddy BA, Sreenath DAR, Devappa V. Field efficacy of new fungicide molecules against late blight of potato in southern Karnataka. In: Proceedings of the 3rd International Symposium on Phytophthora: Taxonomy, Genomics, Pathogenicity, Resistance, and Disease Management. 1st ed. Bengaluru (India): University of Agricultural Sciences; 2015. p. 1–54.
7. Kavya B. Studies on the late blight disease of potato (Solanum tuberosum L.) [MSc (Agri) thesis]. Bengaluru (India): University of Agricultural Sciences; 2016.
8. Harisha YN. Studies on management of late blight disease of potato caused by Phytophthora infestans (Mont.) de Bary [thesis]. Bengaluru (India): University of Agricultural Sciences; 2017.
9. Stevic M, Pavlovic B, Tanovic B. Efficacy of fungicides with different modes of action in raspberry spur blight (Didymella applanata) control. Pestic Phytomed (Belgrade). 2017;32(1):25–32.
10. Ahmad S, Khan MA, Sahi ST. Impact of environmental factors on the development of potato late blight and its management. J Phytopathol. 2023;171(4):185–194.
11. Miller JS, Hamm PB. Evaluation of fungicides for the control of powdery scab on potatoes. Plant Dis. 2024;108(2):412–420.
12. Thompson RL, Davis AL. Relationships between tuber size and susceptibility to soil-borne pests in Solanum tuberosum. Agric Ecosyst Environ. 2022;330:107–115.
13. Garcia-Blanco M, Peters RD. Correlation studies in potato breeding for resistance to common scab and tuber quality. Am J Potato Res. 2023;100(3):245–258.
14. Kumar V, Singh BP. Genetic correlations and path coefficient analysis for yield and its components in potato. Indian J Genet Plant Breed. 2025;85(1):72–79.

Regular Issue Subscription Original Research
Volume 15
Issue 01
Received 14/11/2025
Accepted 02/01/2025
Published 06/02/2026
Publication Time 84 Days
144

Login


My IP

PlumX Metrics