Gerami, E., Azimi, H., Beiki, F. (2019). Evaluation of the Efficacy of ametoctradin + dimethomorph (Orvego® SC 525) and mandipropamid + difenoconazole (Carial Star® SC 500) Fungicides against Cucumber Downy Mildew Disease, Caused by Pseudoperonospora cubensis. , 6(1), 26-37. doi: 10.22092/jppps.2019.122151
E. Gerami; H. Azimi; F. Beiki. "Evaluation of the Efficacy of ametoctradin + dimethomorph (Orvego® SC 525) and mandipropamid + difenoconazole (Carial Star® SC 500) Fungicides against Cucumber Downy Mildew Disease, Caused by Pseudoperonospora cubensis". , 6, 1, 2019, 26-37. doi: 10.22092/jppps.2019.122151
Gerami, E., Azimi, H., Beiki, F. (2019). 'Evaluation of the Efficacy of ametoctradin + dimethomorph (Orvego® SC 525) and mandipropamid + difenoconazole (Carial Star® SC 500) Fungicides against Cucumber Downy Mildew Disease, Caused by Pseudoperonospora cubensis', , 6(1), pp. 26-37. doi: 10.22092/jppps.2019.122151
Gerami, E., Azimi, H., Beiki, F. Evaluation of the Efficacy of ametoctradin + dimethomorph (Orvego® SC 525) and mandipropamid + difenoconazole (Carial Star® SC 500) Fungicides against Cucumber Downy Mildew Disease, Caused by Pseudoperonospora cubensis. , 2019; 6(1): 26-37. doi: 10.22092/jppps.2019.122151

Evaluation of the Efficacy of ametoctradin + dimethomorph (Orvego® SC 525) and mandipropamid + difenoconazole (Carial Star® SC 500) Fungicides against Cucumber Downy Mildew Disease, Caused by Pseudoperonospora cubensis

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Volume 6, Issue 1 - Serial Number 11, August 2019, Pages 26-37    PDF (671 K)
Document Type: Research Paper
DOI: 10.22092/jppps.2019.122151
Authors
E. Gerami1; H. Azimi* 2; F. Beiki3
1Azad University
2IRIPP
3. Laboratory of Amol, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Mazandaran Province, Iran.
Abstract
Downy mildew, caused by Pseudoperonospora cubensis, is one of the most destructive pathogen to cucumber specially cultivated in the greenhouses. Experiments were performed to evaluate new fungicides for the control of cucumber downy mildew in Tehran and Mazandaran provinces in a RCBD with 10 treatments and 4 replications. Treatments included 0.6, 0.7 and 0.8 ml/L-1 of ametoctradin+dimethomorph (OrvegoSC 525) and 0.5, 0.6 and 0.7 ml/L-1 of mandipropamid+difenoconazole (Carial-StarSC 500) as target fungicides, propamocarb hydrochloride+fluopicolide (Infinito SC 68.75) 2 ml/L-1 and cyazofamid (Ranman SC 40) 0.5 ml/L-1 as standard fungicides, non-treated and water treatment controls. Foliar applications started upon appearance of symptoms and followed up with 7 days intervals. Plants were evaluated when the disease severity reached to 9 based on Thomas et al. scale in water treatment. Results revealed that the doses of 0.7, and 0.8 ml/L-1 of Orvego and 0.7 ml/L-1 of Carial-Star decreased disease severity by 80.3, 84.7, and 77.2% respectively compared with the water treatment. The efficacy of Infinito and Ranman were 66 and 72.8% respectively and were placed in the same statistical group as Orvego with the dose of 0.6 ml/L-1 and efficacy of 68.4%. Carial-Star at the doses of 0.5 and 0.6 ml/L-1 showed disease control up to 53.8 and 61.6%. Results indicate that Orvego and Carial-Star can be recommended with the dose of 0.7 ml/L-1 to be used every 7-10 days intervals. However, Orvego with the dose of 0.6 ml/L-1 is could also be recommended in order to reduce pesticide use.
Keywords
chemical control; cyazofamid; cucurbits; downy mildew; fluopicolide; propamocarb
References
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