Fungicide Sensitivity of Colletotrichum Species Causing Bitter Rot of Apple in the Mid-Atlantic U.S.A

Fungicide Sensitivity of Colletotrichum Species Causing Bitter Rot of Apple in the Mid-Atlantic U.S.A

Apple growers in the Mid-Atlantic region of the U.S.A. have reported increased losses to bitter rot of apple. We tested the hypothesis that this increase is because the Colletotrichum population has developed resistance to commonly used single-mode-of-action (single-MoA) fungicides. We screened 220...

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Veröffentlicht in:Plant disease. - 1997. - 106(2022), 2 vom: 05. Feb., Seite 549-563
1. Verfasser: Martin, Phillip L (VerfasserIn)
Weitere Verfasser: Krawczyk, Teresa, Pierce, Kristen, Thomas, Catherine, Khodadadi, Fatemeh, Aćimović, Srđan G, Peter, Kari A
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:Plant disease
Schlagworte:Journal Article C. fioriniae C. noveboracense C. siamense Colletotrichum chrysophilum EC(25) EC(50) benzovindiflupyr boscalid cyprodinil mehr... difenoconazole fenbuconazole fluazinam fludioxonil fluopyram flutriafol fluxapyroxad fungicide resistance inpyrfluxam isofetamid kresoxim-methyl mefentrifluconazole myclobutanil penthiopyrad pydiflumetofen pyraclostrobin pyrimethanil thiophanate-methyl trifloxystrobin triflumizole Fungicides, Industrial Cytochromes b 9035-37-4
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520 |a Apple growers in the Mid-Atlantic region of the U.S.A. have reported increased losses to bitter rot of apple. We tested the hypothesis that this increase is because the Colletotrichum population has developed resistance to commonly used single-mode-of-action (single-MoA) fungicides. We screened 220 Colletotrichum isolates obtained from 38 apple orchards in the Mid-Atlantic region for resistance to 11 fungicides in Fungicide Resistance Action Committee (FRAC) groups 1, 7, 9, 11, 12, and 29. Eleven (5%) of these isolates were resistant to FRAC group 1 with confirmed β-tubulin E198A mutations, and two (<1%) were also resistant to FRAC group 11 with confirmed cytochrome-b G143A mutations. Such low frequencies of resistant isolates indicate that fungicide resistance is unlikely to be the cause of any regional increase in bitter rot. A subsample of isolates was subsequently tested in vitro for sensitivity to every single-MoA fungicide registered for apple in the Mid-Atlantic U.S.A. (22 fungicides; FRAC groups 1, 3, 7, 9, 11, 12, and 29), and 13 fungicides were tested in field trials. These fungicides varied widely in efficacy both within and between FRAC groups. Comparisons of results from our in vitro tests with results from our field trials and other field trials conducted across the eastern U.S.A. suggested that EC25 values (concentrations that reduce growth by 25%) are better predictors of fungicide efficacy in normal field conditions than EC50 values. We present these results as a guideline for choosing single-MoA fungicides for bitter rot control in the Mid-Atlantic U.S.A 
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650 4 |a C. fioriniae 
650 4 |a C. noveboracense 
650 4 |a C. siamense 
650 4 |a Colletotrichum chrysophilum 
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650 4 |a mefentrifluconazole 
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650 4 |a penthiopyrad 
650 4 |a pydiflumetofen 
650 4 |a pyraclostrobin 
650 4 |a pyrimethanil 
650 4 |a thiophanate-methyl 
650 4 |a trifloxystrobin 
650 4 |a triflumizole 
650 7 |a Fungicides, Industrial  |2 NLM 
650 7 |a Cytochromes b  |2 NLM 
650 7 |a 9035-37-4  |2 NLM 
700 1 |a Krawczyk, Teresa  |e verfasserin  |4 aut 
700 1 |a Pierce, Kristen  |e verfasserin  |4 aut 
700 1 |a Thomas, Catherine  |e verfasserin  |4 aut 
700 1 |a Khodadadi, Fatemeh  |e verfasserin  |4 aut 
700 1 |a Aćimović, Srđan G  |e verfasserin  |4 aut 
700 1 |a Peter, Kari A  |e verfasserin  |4 aut 
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