Efficacy of new brands of Azoxystrobin + Difenoconazole fungicide in the control of cucumber powdery mildew disease

Document Type : Research Paper

Authors

1 Plant Protection Research Department, Yazd Agricultural and Natural Resources Research and Education Center, AREEO, Yazd, Iran

2 2Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

Abstract

Cucumber powdery mildew disease which is caused by Golovinomyces cichoracearum, is one of the most important diseases of cucumber in Iran and world. In this study, the efficacy of two new fungicides, Safir® SC 32.5% and Diforobin SC 32.5%, in the control of cucumber powdery mildew disease were evaluated. Experiments were carried out in Alborz and Tehran provinces in a Randomized Complete Block Design (RCBD) with 9 treatments and 4 replications under greenhouse conditions. Treatments included 0.5, 0.6 and 0.75 ml/L of Safir®; 0.5, 0.75 and 1 ml/L of Diforobin; 0.4 ml/L of tetraconazol (Domark® EC 10%) and 5 g/L of bicarbonate potassium (Kaliban® SL 85%) along with control without any spraying. Foliar applications of fungicides started once after early symptoms appearance and followed up at 5-10 days intervals. Evaluation of the treated plots were done before each spraying and 12 days after last spraying as the disease severity index (DSI). Disease severity was classified using the Horsfall and Barrat scale. Mid-point of disease severity calculated for each plant. The efficacy comparisons revealed that Safir® 0.75 ml/L, Diforobin® 0.75 and 1 ml/L and Domark® 0.4 ml/L as a standard treatment had the same effects due to statistical points and decreased the Area Under the Disease Curve by the 90% compared to unsprayed check treatment. Based on the results, the fungicides Safir® and Diforobin® may be recommended to be used for registration at 0.75 ml/L for 7 to 14-days intervals.

Keywords

References

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© 2021 Copyright by Faculty of Agriculture, University of Tabriz, Tabriz, Iran. This is an open access article under the CC BY NC license (https://creativecommons.org/licenses/by-nc/2.0/)
 
 
 
 
 
 
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Journal of Applied Research in Plant Protection
Volume 10, Issue 2
June 2021
Pages 33-46

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  • Receive Date: 26 April 2021
  • Accept Date: 26 April 2021

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