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240312s2024 xx |||||o 00| ||eng c |
| 024 |
7 |
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|a 10.1094/PDIS-12-23-2641-RE
|2 doi
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|a eng
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| 100 |
1 |
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|a Weiland, Jerry E
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Fungicide Sensitivity of Phytophthora Isolates from the Washington Red Raspberry Industry
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| 264 |
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|c 2024
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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| 500 |
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|a Date Completed 15.07.2024
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|a Date Revised 15.07.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Phytophthora rubi is an important pathogen causing Phytophthora root rot of red raspberries worldwide. Management of this disease is partially achieved with fungicides, but efficacy has been low, and growers are concerned about fungicide resistance. To determine whether fungicide resistance is developing, Phytophthora species were isolated from 26 raspberry fields with root rot, identified, and evaluated for sensitivity to four fungicides: mefenoxam, phosphorous acid, oxathiapiprolin, and dimethomorph. The majority of the recovered 152 Phytophthora isolates were P. rubi (143 isolates, 25 fields), with P. megasperma (8 isolates, 2 fields) and P. gonapodyides (1isolate, 1field) being found much less frequently. These results confirm P. rubi as the dominant species affecting the Washington red raspberry industry. Almost all tested isolates were sensitive to all four fungicide chemistries, although three isolates were less sensitive to mefenoxam, with effective concentration for 50% growth inhibition (EC50) values ranging from 3.53 to 100 μg active ingredient/ml. No resistance was detected against current fungicide label rates. However, other reasons were identified for why fungicides have been ineffective. Label rates vary widely by brand, and most fungicides are applied in the fall when P. rubi is inactive. In addition, some phosphorous acid products are only labeled for foliar applications, which have been shown to be less effective than soil applications in other agricultural systems. Efficacy trials are needed to compare foliar and soil fungicide applications at different times of the year for their ability to control Phytophthora root rot in red raspberry production fields
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4 |
|a Journal Article
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4 |
|a Phytophthora root rot
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| 650 |
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4 |
|a fungicide resistance
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| 650 |
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4 |
|a mefenoxam
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| 650 |
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4 |
|a phosphite
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| 650 |
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4 |
|a phosphorous acid
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| 650 |
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7 |
|a Fungicides, Industrial
|2 NLM
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| 650 |
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7 |
|a mefenoxam
|2 NLM
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| 650 |
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7 |
|a F1Q54ONN4H
|2 NLM
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| 650 |
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7 |
|a Alanine
|2 NLM
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| 650 |
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7 |
|a OF5P57N2ZX
|2 NLM
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| 700 |
1 |
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|a Scagel, Carolyn F
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Benedict, Chris
|e verfasserin
|4 aut
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| 700 |
1 |
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|a DeVetter, Lisa Wasko
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Beck, Bryan R
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Plant disease
|d 1997
|g 108(2024), 7 vom: 01. Juli, Seite 2104-2110
|w (DE-627)NLM098181742
|x 0191-2917
|7 nnns
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|g volume:108
|g year:2024
|g number:7
|g day:01
|g month:07
|g pages:2104-2110
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| 856 |
4 |
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|u http://dx.doi.org/10.1094/PDIS-12-23-2641-RE
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