Influence of cultivar, environmental conditions, and fungicides on development of Phytophthora root rot and wilt on red raspberry

Sapkota, Sanjib; Burlakoti, Rishi R.; Punja, Zamir K.; Gerbrandt, Eric M.

doi:10.1016/j.cropro.2023.106347

Crop Protection

2023

DOI: 10.1016/j.cropro.2023.106347

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Influence of cultivar, environmental conditions, and fungicides on development of Phytophthora root rot and wilt on red raspberry

Sanjib Sapkota

Rishi R. Burlakoti

Zamir K. Punja

et al.

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2024

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Cited by 3 publications

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Fungicide Sensitivity of Phytophthora Isolates from the Washington Red Raspberry Industry

Weiland,

Scagel,

Benedict

et al. 2024

Plant Disease

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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 (1 isolate, 1 field) 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 EC50 values ranging from 3.53 to 100 µg ai/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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Fungicide Sensitivity of Phytophthora Isolates from the Washington Red Raspberry Industry

Weiland,

Scagel,

Benedict

et al. 2024

Plant Disease

View full text Add to dashboard Cite

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Disease epidemiology and management of phytophthora root rot and wilt of red raspberry

Burlakoti,

Sapkota

2024

Acta Hortic.

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Mykobiota sadzonek wybranych roślin jagodowych

Jamiołkowska

2024

Ann. Hortic.

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Polska jest jednym z największych producentów owoców miękkich. Sprzyjają temu warunki klimatyczne i położenie geograficzne naszego kraju. Decydujący wpływ na jakość owoców i prowadzenie uprawy ma zdrowotność sadzonek w szkółce. Ważne jest, aby plantacje były zakładane ze zdrowych sadzonek, a materiał rozmnożeniowy pochodził z kwalifikowanych szkółek. Grzyby i organizmy grzybopodobne stanowią bardzo poważny problem w szkółkach roślin jagodowych. Badania miały na celu określenie składu gatunkowego grzybów zasiedlających ogonki liściowe, podstawę pędu i korzenie sadzonek truskawki, maliny i agrestu przeznaczonych do uprawy towarowej. Badania wykazały, że sadzonkom truskawki zagraża organizm grzybopodobny Phytophthora cactorum oraz grzyby Botrytis cinerea i Colletotrichum acutatum. Najliczniej zasiedlaną przez P. cactorum odmianą truskawki jest ‘Dipred’. Sprawcami zamierania sadzonek malin i agrestu są głównie B. cinerea i Phytophthora spp. Organizm grzybopodobny Phytophthora spp. był licznie izolowany z odmian maliny ‘Polka’, ‘Kwanza’ i ‘Imara’ oraz sadzonek agrestu odmiany ‘Pax’. Ocena składu gatunkowego grzybów zasiedlających sadzonki truskawek, maliny i agrestu pozwoli na podjęcie właściwej ochrony w celu zabezpieczenia plantacji towarowych przed zasiedlaniem groźnymi patogenami grzybowymi.

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Influence of cultivar, environmental conditions, and fungicides on development of Phytophthora root rot and wilt on red raspberry

Cited by 3 publications

References 29 publications

Fungicide Sensitivity of Phytophthora Isolates from the Washington Red Raspberry Industry

Fungicide Sensitivity of Phytophthora Isolates from the Washington Red Raspberry Industry

Disease epidemiology and management of phytophthora root rot and wilt of red raspberry

Mykobiota sadzonek wybranych roślin jagodowych

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