EMS and UV irradiation induce unstable resistance against CAA fungicides in Bremia lactucae

Rubin, Avia E.; Werdiger, Ayelet-Chen; Blum, Mathias; Gisi, U.; Sierotzki, Helge; Hermann, D.; Cohen, Yigal

doi:10.1007/s10658-010-9698-6

Cited by 3 publications

(1 citation statement)

References 9 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We currently attempt to produce OXPT-resistant mutants of P . infestans in the laboratory by employing the methods we used before to produce mutants resistant to MPD and MFX [ 21 – 23 ]. Testing the usefulness of the above OXPT mixtures against OXPT-resistant mutants will be our next challenge.…”

Section: Discussionmentioning

confidence: 99%

Oxathiapiprolin-based fungicides provide enhanced control of tomato late blight induced by mefenoxam-insensitive Phytophthora infestans

2018

Self Cite

View full text Add to dashboard Cite

Oxathiapiprolin is a new fungicide with extremely high efficacy against oomycete plant pathogens. Solo components oxathiapiprolin (OXPT), chlorothalonil (CHT), azoxystrobin (AZ), mandipropamid (MPD), and mefenoxam (MFX) were compared with each other and with four oxathiapiprolin pre-packed fungicidal mixtures, OXPT+CHT 1+66.7, OXPT+AZ 1+10.3, OXPT+MPD 1+8.3, and OXPT+MFX 1+3 (weight active ingredient ratio), for control efficacy of late blight induced by MFX-insensitive Phytophthora infestans strains in tomato in growth chambers and the field. Mixtures performed better than all partner fungicides alone, except OXPT. Of the four mixtures, OXPT+MFX outperformed, with the highest preventive, curative, translaminar, and systemic efficacies. In the field, OXPT+MFX was superior to other fungicides in controlling late blight epidemics induced by MFX-insensitive isolates. Its deployment in the field will combat the dominating MFX-insensitive isolates, reduce the selection pressure imposed on P. infestans and delay the buildup of subpopulations resistant to oxathiapiprolin.

show abstract

Section: Discussionmentioning

confidence: 99%

Oxathiapiprolin-based fungicides provide enhanced control of tomato late blight induced by mefenoxam-insensitive Phytophthora infestans

2018

Self Cite

View full text Add to dashboard Cite

show abstract

Mating type and sexual reproduction of Pseudoperonospora cubensis, the downy mildew agent of cucurbits

Cohen

Rubin

2011

Eur J Plant Pathol

Self Cite

View full text Add to dashboard Cite

The oomycete Pseudoperonospora cubensis is a leaf pathogen causing severe damage to members of the Cucurbitaceae, especially cucumber and melon. It propagates clonally by sporangia. Oospores of P. cubensis were previously observed in nature but their formation in the laboratory was never reported nor their germination or infection. Here we report on the sexual reproduction of P. cubensis under controlled conditions in the laboratory. When field isolates were inoculated singly onto detached leaves of cucurbits in growth chambers no oospores were produced. However, when pairs of selected isolates were mixed and inoculated onto detached leaves, oospores were formed in the mesophyll within 6-11 days, suggesting that P. cubensis is heterothallic, having two opposite mating types, A1 and A2. Isolates belonging to pathotype 3 were all A1 whereas isolates belonging to the new pathotype 6 were either A1 or A2. Oospores were spherical,~40 μm in diameter, hyaline to red-brown in color. Oospores were produced regularly, in large numbers, in Cucumis sativum and Cucumis melo, very seldom and in very small numbers in Cucurbita pepo, Cucurbita maxima and Citrullus lanatus, and not in Cucurbita moschata. Oospores were formed at 12.5-21°C but not at 25°C. Under moisture-saturated atmosphere oospores were also produced in leaves of intact plants. Oospores inoculated onto detached leaves in growth chambers produced F1 downy mildew lesions at 6-21 days after inoculation, many in Cucumis sativum, Cucumis melo and Cucurbita moschata, very few in Cucurbita pepo or Citrullus lanatus, and none in Cucurbita maxima. This report shows that P. cubensis is heterothallic, having A1 and A2 mating types which can cross and enable sexual reproduction in cucurbits. A preliminary report on part of the results has been published earlier.

show abstract

Fungicide Resistance: Progress in Understanding Mechanism, Monitoring, and Management

et al. 2023

View full text Add to dashboard Cite

Fungicide treatments are often essential for maintaining healthy crops and to achieve reliable and high-quality yields. However, continued use of fungicides with the same modes of action can lead to development of fungicide resistance, which has emerged in various plant pathogens and is a serious threat to effective crop protection. Exploration of resistance mechanisms is critical for resistance monitoring and management. This brief review summarizes advances during the past five decades in understanding the molecular resistance mechanisms of plant pathogenic fungi and oomycetes to major classes of fungicides, including benzimidazoles, myosin inhibitors, sterol demethylation inhibitors, quinone outside inhibitors, succinate dehydrogenase inhibitors, anilinopyrimidines, carboxylic acid amides, and oxysterol-binding protein homolog inhibitors. Based on known resistance mechanisms, PCR and loop-mediated isothermal amplification-based approaches have been developed to allow high-throughput monitoring and early/rapid detection of emerging resistance. Classical principles in fungicide resistance management are also summarized, including using different modes of action of fungicides, limiting the number of applications of the chemicals with site-specific modes of action, and avoidance of their eradicant use. Future studies on novel strategies of disease management, including development of epigenetics- and RNA-based fungicides, will provide valuable knowledge for management of fungicide resistance.

show abstract

EMS and UV irradiation induce unstable resistance against CAA fungicides in Bremia lactucae

Cited by 3 publications

References 9 publications

Oxathiapiprolin-based fungicides provide enhanced control of tomato late blight induced by mefenoxam-insensitive Phytophthora infestans

Oxathiapiprolin-based fungicides provide enhanced control of tomato late blight induced by mefenoxam-insensitive Phytophthora infestans

Mating type and sexual reproduction of Pseudoperonospora cubensis, the downy mildew agent of cucurbits

Fungicide Resistance: Progress in Understanding Mechanism, Monitoring, and Management

Contact Info

Product

Resources

About