Evaluation of different concentrations of Miavis® Duo 75 (SC 200) in the control of tomato powdery mildew under field conditions

Document Type : Research Paper

Authors

1 Plant Diseases Research Department, Iranian Research Institute of Plant Protection, AREEO, Tehran, Iran

2 Plant Protection Research Department, Khorasan Razavi, Agricultural and Natural Resources Research and Education Center, AREEO, Mashhad, Iran.

3 Plant Diseases Research Department, Iranian Research Institute of Plant Protection, AREEO, Tehran, Iran.

Abstract

The present study aimed to find out the minimum effective concentration of Miravis Duo®75 (SC 200) fungicide for preventing the progress of tomato powdery mildew disease caused by Leveillula taurica, in comparison with Signum® fungicide under field conditions. Two experiments were performed in Karaj and Mashad using Randomized Complete Block Design (RCBD) with five treatments and four replications. Treatments were three concentarions of Miravis Duo® (700, 1000 and 1200 ml/ha), Signum® (500 g/ha) as reference fungicide and water spraying as the control. Foliar spraying of experimental plots was started as the first disease symptoms appeared and repeated four times at 11 days intervals. The effect of treatments was assessed before each spraying by estimating the percentage of plant foliage covered by powdery mildew for five randomly selected plants in each replication. Analysis of variance of data in both locations showed that the effect of treatments on disease severity index (DSI) and the Area Under Disease Progress Curve (AUDPC) were significantly different (P≤ 0.01). Also in both locations, there were significant differences between 700 ml/ha of Miravis Duo® and the other two Miravis Duo® concentrations of this fungicide (1000 and 1200 ml/ha) as well as Signum® fungicide, in reducing DSI , although  there were not statistically significant difference between  1000 and 1200 ml/ha concentrations.  The efficiency of 1000 and 1200 ml/ha concentrations were 59% and 65.5% respectively compared to the control, which were not significantly different with Signum®. Therefore the minimum effective dose of Miravis Duo ® fungicide for controling tomato powdery mildew is 1000 ml/ha which recommended alternatively with other registered fungicides.

Keywords

References

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Journal of Applied Research in Plant Protection
Volume 13, Issue 1
April 2024
Pages 1-12

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History

  • Receive Date: 11 April 2023
  • Revise Date: 14 September 2023
  • Accept Date: 17 September 2023

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