Pseudoperonospora cubensis in China: Its sensitivity to and control by oxathiapiprolin

Miao, Jianqiang; Dong, Xianggui; Chi, Yuandong; Lin, Dong; Chen, Furu; Du, Yongle; Liu, Pengfei; Liu, Xili

doi:10.1016/j.pestbp.2018.03.009

Cited by 24 publications

(40 citation statements)

References 19 publications

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“…The acceptable daily intake (ADI) for oxathiapiprolin is 0.14 mg per kg bw per day, and the ADI for its metabolite IN-E8S72 is 1.157 mg per kg bw per day [17]. However, data presented by different researchers indicate that oxathiapiprolin is a high-risk fungicide that requires careful use in the field to avoid resistance [26][27][28][29]. The Codex Alimentarius Commission (CAC) has established maximum residue limits (MRLs) for oxathiapiprolin in different agro-products, and these range from 0.01 to 0.9 mg/kg, representative MRLs are 0.01, 0.04, 0.7, and 0.9 mg/kg in potatoes, garlic, head cabbage, and grapes, respectively.…”

Section: Introductionmentioning

confidence: 99%

Enantioselective residue analysis of oxathiapiprolin and its metabolite in tea and other crops by ultra‐high performance liquid chromatography–tandem mass spectrometry

Zhang

Sun

Wang

et al. 2020

J of Separation Science

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Oxathiapiprolin is the first chiral piperidinyl thiazole isoxazoline fungicide developed to control downy mildew and other diseases, and there were no prior reports on its enantiomeric residue. In this study, a modified quick, easy, cheap, effective, rugged, and safe extraction and purification method followed by ultrahigh performance liquid chromatography-tandem mass spectrometry determination was first developed and validated for the residue analysis of oxathiapiprolin enantiomers and its metabolite IN-E8S72 in green tea and other crops. Oxathiapiprolin enantiomers and IN-E8S72 were separated on a chiral Lux Cellulose-3 column with the use of 0.1% formic acid in acetonitrile and 5 mmol/L ammonium acetate in water as mobile phases. IN-E8S72 was eluted first, followed by (−)oxathiapiprolin, and then (+)-oxathiapiprolin. The recoveries ranged from 53.3 to 125.3% with relative standard deviations ranging from 1.4 to 16.0%. The limits of quantification for (−)-oxathiapiprolin and (+)-oxathiapiprolin were 0.005 mg/kg in romaine lettuce, head cabbage, potato, grape, and garlic, 0.01 mg/kg in soybean and pea, and 0.025 mg/kg in green tea and dry pepper. The limits of quantification of IN-E8S72 were twice those of (−)-oxathiapiprolin. Screening results with real market samples indicated that there was no enantiomeric excess in the oxathiapiprolin residue in romaine lettuce.

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Section: Introductionmentioning

confidence: 99%

Enantioselective residue analysis of oxathiapiprolin and its metabolite in tea and other crops by ultra‐high performance liquid chromatography–tandem mass spectrometry

Zhang

Sun

Wang

et al. 2020

J of Separation Science

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“…Downy mildew is known to be one of the most destructive diseases of cucumber crop, threatening its production and causing significantly economic losses. The obligate biotrophic oomycete P. cubensis is responsible for this disease and it has been reported in over 70 countries [1]. According to researches, 100% decrease of production yield can occur without the use of fungicides in young cucumber plants, while if fungicides are applied one week after the symptoms appearance, yield is reduced at about 50% [2].…”

Section: Introductionmentioning

confidence: 99%

“…In order to control P. cubensis spread, a lot of fungicides are used worldwide, however, the oomycetes develop resistance to them quite quickly [1]. Therefore, to reduce the use of chemicals, research interest has been focused on alternatives such as enhancement of the plant immunity [3].…”

Section: Introductionmentioning

confidence: 99%

The impact of potassium on downy mildew of cucumber and its leaf/soil nutritional status.

Papadaki¹,

Papazoglou²,

Ladomenou³

et al. 2019

SDRP-JPS

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Background: The interaction of plant nutrition and disease development has been well documented. Potassium (K) application has been widely recognized to decrease disease incidence in many host plants. However, contradictory reports about its impact on plant diseases have been ascertained therefore further research is needed for each host-pathogen system. The objective of the present study was to examine the effect of K levels on downy mildew severity and assess their impact on soil and nutritional status of cucumber plants. Methods: K (200-700 mg L-1) was applied to plants grown in pots under greenhouse conditions through fertigation, according to a randomized block design with four replicates. Nitrogen (N) and phosphorus (P) were given to plants at stable concentrations. The cucumber leaves were inoculated with a zoospore suspension of Pseudoperonospora cubensis, the causal agent of downy mildew. Leaf and lesion area as well as nutrients in plant tissues and soil were determined. Results: Plants treated with 300 and 400 mg L-1 of K demonstrated the lowest downy mildew severity. Above these rates, K supply led to downy mildew increase in cucumber leaves. The cubic regression curve can be fitted to the disease progress for downy mildew, irrespective of K doses. Leaf and soil nutrient content appeared to affect infection and leaf size. Reduced concentration of soil NH 4-N was noticed in fertigation levels of 300 and 400 mg L-1 K and the lowest Mn content appeared in leaves of cucumber plants grown in 400 mg L-1 K. Conclusion: The suppression effect of K on downy mildew had an optimum limit and beyond this, disease spread was observed. K enrichment of soil via potassium nitrate fertilizer could be considered as an efficient method for the control of downy mildew of cucumber plants.

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“…It stops mycelial growth and inhibits further lesion expansion, and inhibits spore production. It phenotypically shows translaminar and acropetally systemic movement, protecting treated leaves and new leaves as they emerge and grow [ 2 , 4 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Oxathiapiprolin solo was evaluated in the field for control of the major oomycete diseases of grapes, potatoes, and vegetables. It demonstrated outstanding control of potato late blight, grape downy mildew, cucumber downy mildew and crown and root rot of peppers [ 2 , 10 ]. Soil-directed applications of OXPT alone or in alternation with mefenoxam, effectively reduced black shank of tobacco [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

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

2018

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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.

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Pseudoperonospora cubensis in China: Its sensitivity to and control by oxathiapiprolin

Cited by 24 publications

References 19 publications

Enantioselective residue analysis of oxathiapiprolin and its metabolite in tea and other crops by ultra‐high performance liquid chromatography–tandem mass spectrometry

Enantioselective residue analysis of oxathiapiprolin and its metabolite in tea and other crops by ultra‐high performance liquid chromatography–tandem mass spectrometry

The impact of potassium on downy mildew of cucumber and its leaf/soil nutritional status.

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

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