Article
Plant Sciences
Yigal Elad, Dor Barnea, Dalia Rav-David, Uri Yermiyahu
Summary: The study found that spraying CaCl2, MgCl2, KCl, and K2SO4 can reduce the occurrence of cucumber powdery mildew. There is a significant negative correlation between salt concentrations and disease severity. Chloride salts are more effective than sulfate salts. Cucumbers at different growth stages have different nutrient requirements, and spraying treatments are more effective than fertigation treatments.
Article
Plant Sciences
Michael G. Palmer, Gerald J. Holmes
Summary: Field observations indicate reduced fungicide sensitivity in field populations of Podosphaera aphanis, the causal agent of strawberry powdery mildew (SPM). This study characterizes the sensitivity of 19 P. aphanis isolates to common fungicides used against SPM in California, revealing resistance to most fungicides and the first ever reported resistance to penthiopyrad and quinoxyfen worldwide in P. aphanis.
Article
Agronomy
Odile Carisse, Mamadou Lamine Fall
Summary: This study developed a risk prediction model for strawberry powdery mildew using CART models, considering factors such as inoculum, resistance, and weather conditions. The model showed good sensitivity, specificity, and accuracy in training and validation datasets, providing a useful tool for farmers to manage the disease effectively.
Article
Plant Sciences
Thomas Heaven, Helen M. M. Cockerton, Xiangming Xu, Matthew Goddard, Andrew D. D. Armitage
Summary: This study presents the first genome assembly for Podosphaera aphanis, the causal agent of powdery mildew on strawberry. The assembled genome consists of 12,357 contigs and has 17,239 predicted genes encoding 17,328 proteins. This annotated genome provides a molecular resource for investigating host-pathogen interactions in the strawberry powdery mildew pathosystem.
Review
Microbiology
Nisrine Bakhat, Alejandra Vielba-Fernandez, Isabel Padilla-Roji, Jesus Martinez-Cruz, Alvaro Polonio, Dolores Fernandez-Ortuno, Alejandro Perez-Garcia
Summary: Fungal pathogens pose a growing threat to crop production worldwide, and chitin-induced immunity plays a crucial role in plant defense against these pathogens. However, fungi have developed various strategies to evade chitin-triggered immunity, including the secretion of effector proteins that modify or degrade chitin oligomers. This review provides an overview of chitin-triggered immune signaling and the mechanisms employed by fungi to suppress it, using powdery mildew fungi as an example.
Article
Agriculture, Multidisciplinary
Florian Wulf, Jana Podhorna, Martina Bandte, Malgorzata Rybak, Carmen Buettner
Summary: Alternative strategies are needed in plant protection due to political and environmental conditions. This study found that foliar application of hydrogen peroxide and Equisetum arvense extract can reduce foliar diseases in cut roses without negative effects on plant growth and flower production.
JOURNAL OF PLANT DISEASES AND PROTECTION
(2023)
Article
Plant Sciences
Alvaro Polonio, Dolores Fernandez-Ortuno, Antonio de Vicente, Alejandro Perez-Garcia
Summary: PHEC27213 is a novel fungal LPMO that catalyzes chitooligosaccharides, contributing to the suppression of plant immunity during haustorium development. This protein has the potential to prevent the activation of chitin-triggered immunity, representing a new mechanism in fungal pathogens to manipulate host immunity.
MOLECULAR PLANT PATHOLOGY
(2021)
Article
Plant Sciences
Belachew Asalf, Rodrigo B. Onofre, David M. Gadoury, Natalia A. Peres, Arne Stensvand
Summary: This study found that using pulsed water mist can effectively suppress powdery mildew in strawberry, with similar effect to multiple fungicide treatments. Additionally, rapid drying of the water mist can effectively suppress powdery mildew without increasing other fungal pathogens that might benefit from water films.
Article
Agronomy
Radhakrishna Shetty, Birgit Jensen, Dale Shelton, Kirsten Jorgensen, Pai Pedas, Hans Jorgen Lyngs Jorgensena
Summary: Silicon application in miniature potted roses can decrease powdery mildew severity by increasing callose and hydrogen peroxide accumulation, as well as hypersensitive cell responses. Inhibition of these responses led to increased disease severity in silicon-treated plants, indicating the importance of callose and H2O2 activation in defense against the pathogen. Additionally, enhanced photosynthesis in silicon-treated plants further strengthened the plant's resistance.
PEST MANAGEMENT SCIENCE
(2021)
Article
Plant Sciences
Shuwu Zhang, Jia Liu, Bingliang Xu, Jingjiang Zhou
Summary: The study demonstrated that the Sixing F-1 cultivar showed stronger resistance to P. xanthii infection compared to the Jin(12) F-1 cultivar. This resistance mechanism may involve activating and enhancing the activity and gene expression of the phenylpropanoids pathway, ROS scavenging defense enzymes, and signaling pathway marker gene expression in C. pepo cultivars to prevent pathogen infection and improve plant disease resistance.
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Seunghwan Kim, Sathiyamoorthy Subramaniyam, Myunghee Jung, Eun-A Oh, Tae Ho Kim, Jeong-Gu Kim
Summary: Cucurbitaceae family consists of approximately 33 common fruits and vegetables, making it an important worldwide crop family. However, the resistance of pathogens to pesticides and fungicides has become a growing issue in cultivation practices. This study characterized the genome of the fungal pathogen Podosphaera xanthii, providing a valuable resource for future research on its host-specific pathogenesis.
MOLECULAR PLANT-MICROBE INTERACTIONS
(2021)
Article
Biotechnology & Applied Microbiology
Fazhong Yang, Chunhua Wu, Guolei Zhu, Qi Yang, Kejian Wang, Yunxian Li
Summary: We investigated the changes in transcriptomics and metabolomics in Rosa chinensis after infection with Podosphaera pannosa and treatment with exogenous salicylic acid (SA) separately. The response of roses to mildew infection was similar to SA treatment. Through omics analysis, it was found that R. chinensis consistently responded to both P. pannosa and SA induction through MAPK cascades, plant-pathogen interaction pathway activation, and R genes expression. Furthermore, triterpenoid biosynthesis, glutathione metabolism, and linoleic acid metabolism were significantly enriched. The levels of certain triterpenoids were up-regulated, indicating their involvement in resistance to P. pannosa. The contents of salicylic acid beta-D-glucoside, methyl salicylate, and methyl jasmonate also increased significantly due to both P. pannosa infection and SA treatment.
Article
Plant Sciences
Briana J. Claassen, Sierra N. Wolfenbarger, David H. Gent
Summary: Understanding the physical mode of action of fungicides can improve their effectiveness in controlling diseases. Greenhouse and field studies on hop powdery mildew show that preventive applications of fluopyram and flutriafol are most effective, while fluopyram or fluopyram + trifloxystrobin can suppress mildew development regardless of application timing.
Article
Agronomy
Haonan Cui, Chao Fan, Zhuo Ding, Xuezheng Wang, Lili Tang, Yingdong Bi, Feishi Luan, Peng Gao
Summary: In this study, two genes for resistance to Podosphaera xanthii race 1 in melon were identified. Through the analysis of the disease-resistant MR-1 melon cultivar, two candidate genes related to powdery mildew resistance were found. These findings provide new genetic resources and markers for marker-assisted breeding for powdery mildew resistance in melon.
THEORETICAL AND APPLIED GENETICS
(2022)
Article
Plant Sciences
David A. Strickland, Sara M. Villani, Kerik D. Cox
Summary: Powdery mildew, caused by Podosphaera leucotricha, is a common disease in apple trees that affects tree vigor and market yield. Chemical control using demethylation inhibitor (DMI) fungicides is the primary method for managing this disease. This study aimed to determine the best practices for using DMI fungicides to control apple powdery mildew in New York State. The results showed that flutriafol and myclobutanil were the most effective fungicides, while mefentrifluconazole was comparable to difenoconazole. Spraying the fungicides between petal fall and first cover resulted in the lowest incidence of powdery mildew. Additionally, the previous season's application of DMI fungicides had an impact on the incidence of secondary powdery mildew.