Combination of Potassium Phosphite and Reduced Doses of Fungicides Encourages Protection against <i>Phytophthora infestans</i> in Potatoes
Late blight caused by the oomycete <i>Phytophthora infestans</i> is considered the biggest threat to potato farming worldwide. For susceptible cultivars, the disease is often managed by frequent applications of fungicides to reduce yield loss. The use of bio-based compounds that interfer...
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MDPI AG
2022-01-01
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| Series: | Agriculture |
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| Online Access: | https://www.mdpi.com/2077-0472/12/2/189 |
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| author | Neda Najdabbasi Seyed Mahyar Mirmajlessi Kevin Dewitte Marika Mänd Sofie Landschoot Geert Haesaert |
| author_facet | Neda Najdabbasi Seyed Mahyar Mirmajlessi Kevin Dewitte Marika Mänd Sofie Landschoot Geert Haesaert |
| author_sort | Neda Najdabbasi |
| collection | DOAJ |
| description | Late blight caused by the oomycete <i>Phytophthora infestans</i> is considered the biggest threat to potato farming worldwide. For susceptible cultivars, the disease is often managed by frequent applications of fungicides to reduce yield loss. The use of bio-based compounds that interfere with biologically active systems is an innovative strategy for improving disease management. In the present work, the control of <i>P. infestans</i> infection on potatoes by potassium phosphite (KPhi) combined with recommended and reduced doses of active ingredients (Ais) from different fungicides was evaluated. The protective effects of different combinations were initially assessed in vivo and subsequently compared with a greenhouse screening. The active ingredients cyazofamid (CFD) and mancozeb (MCB), used at recommended and reduced doses, were less effective at reducing <i>P. infestans</i> infections than when combined with KPhi. In greenhouse trials, CFD, mandipropamid (MPD) and MCB at recommended doses were the most effective treatments when combined with KPhi; meanwhile, the combination of KPhi with azoxystrobin (AZ), benthiavalicarb-isopropyl/mancozeb (ISO/MCB), and CFD at reduced doses exhibited strong protective activity compared to other similar combinations. This decreased the severity of infection by <i>P. infestans</i> up to ~89%. Greenhouse experiments also demonstrated that a combination of KPhi and CFD at both doses caused the highest reduction in disease severity (up to ~90%) within 35 days of infection. In microplot experiments, KPhi delayed the progression of late blight in susceptible potato varieties; therefore, in the combined treatments AUDPC values were significantly lower than those obtained after applications with CFD doses, providing sufficient protection against late blight. Our data suggest that optimizing the formulation with addition of KPhi could result in a lower recommended dose. This would result in a reduction of the active compounds of the fungicides in potato farming. Furthermore, the impact of KPhi on late blight development makes it a potential component for incorporation into an integrated pest management system. |
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| institution | Directory Open Access Journal |
| issn | 2077-0472 |
| language | English |
| last_indexed | 2024-03-09T22:53:27Z |
| publishDate | 2022-01-01 |
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| spelling | doaj.art-a51410b3cd8d4492939c2a55e8054e1d2023-11-23T18:16:05ZengMDPI AGAgriculture2077-04722022-01-0112218910.3390/agriculture12020189Combination of Potassium Phosphite and Reduced Doses of Fungicides Encourages Protection against <i>Phytophthora infestans</i> in PotatoesNeda Najdabbasi0Seyed Mahyar Mirmajlessi1Kevin Dewitte2Marika Mänd3Sofie Landschoot4Geert Haesaert5Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, BelgiumDepartment of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, BelgiumDepartment of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, BelgiumDepartment of Plant Health, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51014 Tartu, EstoniaDepartment of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, BelgiumDepartment of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, BelgiumLate blight caused by the oomycete <i>Phytophthora infestans</i> is considered the biggest threat to potato farming worldwide. For susceptible cultivars, the disease is often managed by frequent applications of fungicides to reduce yield loss. The use of bio-based compounds that interfere with biologically active systems is an innovative strategy for improving disease management. In the present work, the control of <i>P. infestans</i> infection on potatoes by potassium phosphite (KPhi) combined with recommended and reduced doses of active ingredients (Ais) from different fungicides was evaluated. The protective effects of different combinations were initially assessed in vivo and subsequently compared with a greenhouse screening. The active ingredients cyazofamid (CFD) and mancozeb (MCB), used at recommended and reduced doses, were less effective at reducing <i>P. infestans</i> infections than when combined with KPhi. In greenhouse trials, CFD, mandipropamid (MPD) and MCB at recommended doses were the most effective treatments when combined with KPhi; meanwhile, the combination of KPhi with azoxystrobin (AZ), benthiavalicarb-isopropyl/mancozeb (ISO/MCB), and CFD at reduced doses exhibited strong protective activity compared to other similar combinations. This decreased the severity of infection by <i>P. infestans</i> up to ~89%. Greenhouse experiments also demonstrated that a combination of KPhi and CFD at both doses caused the highest reduction in disease severity (up to ~90%) within 35 days of infection. In microplot experiments, KPhi delayed the progression of late blight in susceptible potato varieties; therefore, in the combined treatments AUDPC values were significantly lower than those obtained after applications with CFD doses, providing sufficient protection against late blight. Our data suggest that optimizing the formulation with addition of KPhi could result in a lower recommended dose. This would result in a reduction of the active compounds of the fungicides in potato farming. Furthermore, the impact of KPhi on late blight development makes it a potential component for incorporation into an integrated pest management system.https://www.mdpi.com/2077-0472/12/2/189field experimentfungicide active ingredientslate blight<i>Phytophthora infestans</i>potassium phosphite |
| spellingShingle | Neda Najdabbasi Seyed Mahyar Mirmajlessi Kevin Dewitte Marika Mänd Sofie Landschoot Geert Haesaert Combination of Potassium Phosphite and Reduced Doses of Fungicides Encourages Protection against <i>Phytophthora infestans</i> in Potatoes Agriculture field experiment fungicide active ingredients late blight <i>Phytophthora infestans</i> potassium phosphite |
| title | Combination of Potassium Phosphite and Reduced Doses of Fungicides Encourages Protection against <i>Phytophthora infestans</i> in Potatoes |
| title_full | Combination of Potassium Phosphite and Reduced Doses of Fungicides Encourages Protection against <i>Phytophthora infestans</i> in Potatoes |
| title_fullStr | Combination of Potassium Phosphite and Reduced Doses of Fungicides Encourages Protection against <i>Phytophthora infestans</i> in Potatoes |
| title_full_unstemmed | Combination of Potassium Phosphite and Reduced Doses of Fungicides Encourages Protection against <i>Phytophthora infestans</i> in Potatoes |
| title_short | Combination of Potassium Phosphite and Reduced Doses of Fungicides Encourages Protection against <i>Phytophthora infestans</i> in Potatoes |
| title_sort | combination of potassium phosphite and reduced doses of fungicides encourages protection against i phytophthora infestans i in potatoes |
| topic | field experiment fungicide active ingredients late blight <i>Phytophthora infestans</i> potassium phosphite |
| url | https://www.mdpi.com/2077-0472/12/2/189 |
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