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The Fungicide and Variety Integration Effect on Late Blight (Phytophthora infestans) Disease of Potato (Solanum tuberosum L.) in Western Amhara Region, Ethiopia

Gebremariam Asaye


Merkuz Abera


Adane Tesfaye

Gebremariam Asaye 1

Merkuz Abera 2 Adane Tesfaye 2 

  1. Adet Agricultural Research Center, Amhara Regional Agricultural Research Institute, Bahir Dar, Ethiopia. 1

  2. College of Agriculture and Environmental Sciences, Bahir Dar University, Bahir Dar, Ethiopia. 2

Pages: 15-29

DOI: 10.18488/journal.70.2020.71.15.29

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Article History:

Received: 21 August, 2019
Revised: 26 September, 2019
Accepted: 28 October, 2019
Published: 10 December, 2019


Potato is suffered by many abiotic and biotic factors. Among biotic factors late blight disease (LBD) is the most important. The study was conducted during 2017 at Adet and Debre-Tabor to determine and evaluate the combination effect of varieties and fungicides, to reduce LBD intensities and increase yield. Four potato varieties and three fungicides with untreated check were used in factorial randomized complete block design with three replications. Lowest disease severity 11.11% was obtained from Belete and Gudene at Adet and Belete at Debre-Tabor. Similarly, the lowest AUDPC (9.33 and 89.83 %-days) were expressed from Gudene + Saboxyl 72% at Adet and Debre-Tabor, respectively, whereas, the maximum PSI and AUDPC were obtained from untreated plots. In average up to 359.81% yield increases were recorded from Abalo + Saboxyl 72% WP. The highest marginal rates of return (2,886.50 % and 3,786.35%) were obtained from Saboxyl 72% treated plots of Abalo & Guassa at Debre-Tabor and Adet, respectively. Therefore, an application of Saboxyl 72% with different varieties was effective at both locations to reduce the yield loss of potato and could be recommended to manage LBD. The combination of Saboxyl 72% with Gudene, Belete and Guassa were highly hinder LBD development at both locations. Even though, its yielding capacity was relatively lower Gudene could be recommended for production without fungicide. Variety Belete and Guassa could be recommended for production in combination with Saboxyl 72%, since they have best performance with relatively lower disease reaction at Adet and Debre-Tabor, respectively.
Contribution/ Originality
This study contributes in the existing literature to fill the gap of the current state of knowledge of late blight disease management of potato. This study is one of very few studies which have investigated potato late blight disease management in Western Amhara Region Ethiopia.


Disease, Fungicide, Gudene, Phytophthora infestans, potato, Saboxyl, Severity, Solanum tuberosum.



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This research is funded by Amhara Regional Agricultural Research Institute and Adet Agricultural Research Center.

Competing Interests:

The authors declare that they have no competing interests.


The authors’ thanks national potato Research programs for providing potato varieties for this study and we also acknowledge.

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