Fungicide trials for the control of Erysiphe polygoni causal agent of powdery mildew on sugar beets in Idaho

2011 ◽  
Author(s):  
Oliver T. Neher ◽  
Tamara Keeth
Keyword(s):  
Powdery Mildew ◽  
Causal Agent ◽  
Sugar Beets ◽  
Erysiphe Polygoni

scholarly journals Occurrence of the Perfect Stage of Powdery Mildew of Sugar Beets in Southern Montana in 2003

Plant Disease ◽  
2005 ◽  
Vol 89 (12) ◽  
pp. 1362-1362
Author(s):  
B. Jacobsen ◽  
M. R. Johnston ◽  
H. C. Weltzien
Keyword(s):  
Powdery Mildew ◽  
Sugar Beet ◽  
Genetic Recombination ◽  
Its Region ◽  
The United States ◽  
Long Distance ◽  
Separate Species ◽  
Sugar Beets ◽  
Perfect Stage ◽  
Erysiphe Polygoni

Wide spread powdery mildew infections on sugar beets were observed at the Southern Agricultural Experiment Station in Huntley, MT during September, 2003. Throughout the area, lower leaves were frequently heavily covered by the vegetative stage of the fungus with plants at the edge of the field having clearly visible abundant mature (black) and immature (brown) globose ascocarps on the leaf surfaces and stems. The fruiting structures had mostly branched appendages and were imbedded in the superficial mycelium. Their diameter ranged from 70 to 100 μm. Each ascocarp contained five to eight asci with one to four ascospores (mostly three) per ascus. Elliptical ascospores were hyaline and measured 20 to 25 μm long and 12 to 20 μm wide. On the basis of the descriptions given for isolates from Idaho and Colorado (1) and the usage of Erysiphe polygoni DC for powdery mildew on sugar beet in the United States, this isolate may be classified as E. polygoni DC. However, measurements taken show that ascocarps, asci, and ascospores also fall within the range of E. betae (Vanha) Weltz. as described by Weltzien (2). We strongly suggest that these species be compared by using rDNA analysis of the ITS region to determine whether they are separate species. If survival of the ascocarps and the viability and pathogenicity of the ascospores can be confirmed, epidemics of sugar beet powdery mildew could be understood as local and regional events that are not dependant on long distance dispersal of conidiospores. The occurrence of the perfect stage also could lead to the more frequent appearance of new races through genetic recombination. References: (1) J. J Gallian and L. E. Hanson. Plant Dis. 87:200, 2003. (2) H. C. Weltzien. Phytopathol. Z. 47:123, 1963.

Identification of a major locus conferring resistance to powdery mildew (Erysiphe polygoni DC) in mungbean (Vigna radiata L. Wilczek) by QTL analysis

Genome ◽  
2003 ◽  
Vol 46 (5) ◽  
pp. 738-744 ◽  
Author(s):  
M E Humphry ◽  
T Magner ◽  
C L McIntyre ◽  
E A.B Aitken ◽  
C J Liu
Keyword(s):  
Powdery Mildew ◽  
Linkage Map ◽  
Qtl Analysis ◽  
Vigna Radiata ◽  
Mapping Population ◽  
Susceptible Variety ◽  
Resistance Response ◽  
Causal Organism ◽  
Major Locus ◽  
Erysiphe Polygoni

A major locus conferring resistance to the causal organism of powdery mildew, Erysiphe polygoni DC, in mungbean (Vigna radiata L. Wilczek) was identified using QTL analysis with a population of 147 recombinant inbred individuals. The population was derived from a cross between 'Berken', a highly susceptible variety, and ATF 3640, a highly resistant line. To test for response to powdery mildew, F7 and F8 lines were inoculated by dispersing decaying mungbean leaves with residual conidia of E. polygoni amongst the young plants to create an artificial epidemic and assayed in a glasshouse facility. To generate a linkage map, 322 RFLP clones were tested against the two parents and 51 of these were selected to screen the mapping population. The 51 probes generated 52 mapped loci, which were used to construct a linkage map spanning 350 cM of the mungbean genome over 10 linkage groups. Using these markers, a single locus was identified that explained up to a maximum of 86% of the total variation in the resistance response to the pathogen.Key words: mungbean, powdery mildew, Erysiphe polygoni, QTL, molecular markers.

scholarly journals Bright-Field and Fluorescence Microscopic Study of Development of Erysiphe polygoni in Susceptible and Resistant Bigleaf Hydrangea

Plant Disease ◽  
2009 ◽  
Vol 93 (2) ◽  
pp. 130-134 ◽  
Author(s):  
Yonghao Li ◽  
Mark T. Windham ◽  
Robert N. Trigiano ◽  
Sandra M. Reed ◽  
James M. Spiers ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Hyphal Growth ◽  
Early Response ◽  
Resistance Mechanisms ◽  
Colony Development ◽  
Susceptible Cultivar ◽  
Bright Field ◽  
Erysiphe Polygoni ◽  
Infected Cells ◽  
Germ Tubes

Temporal development of Erysiphe polygoni and responses of bigleaf hydrangeas (Hydrangea macrophylla) to the fungal attack were investigated using bright-field and fluorescence microscopy. Conidia germinated 2 h after inoculation (HAI) and formed primary appressoria at the tip of the primary germ tubes within 4 HAI. Secondary germ tubes were initiated from primary appressoria or other parts of conidia 12 HAI. Hyphae developed through elongation of secondary germ tubes, and paired lateral appressoria were formed along hyphae within 2 days after inoculation (DAI). Conidiophores and conidia were formed 5 DAI. In the susceptible cultivar Nikko Blue and the resistant cultivar Veitchii, the fungus established a parasitic relationship, which was indicated by the formation of haustoria under primary appressoria and development of secondary germ tubes at 1 DAI. A hypersensitive response (HR) and accumulation of callose were detected in both resistant and susceptible cultivars at 3 DAI. Resistance to powdery mildew in Veitchii was evident by manifestation of early accumulation of callose, relatively high percentage of necrotic infected cells, and restricted colony development compared to the susceptible cultivar Nikko Blue. Restricting hyphal growth and sporulation by early response of callose accumulation and HR are important resistance mechanisms that could be used in screening hydrangeas for resistance to powdery mildew.

scholarly journals First Report of Powdery Mildew Caused by Erysiphe polygoni on Rumex obtusifolius in Korea

Plant Disease ◽  
2019 ◽  
Vol 103 (5) ◽  
pp. 1043-1043
Author(s):  
S. H. Hong ◽  
Y. H. Lee ◽  
Y. J. Choi ◽  
H. D. Shin
Keyword(s):  
Powdery Mildew ◽  
First Report ◽  
Rumex Obtusifolius ◽  
Erysiphe Polygoni

scholarly journals Deciphering the modes of action of Golubevia sp., an antagonist against the causal agent of powdery mildew in wheat, using an mRNA-based systems approach

2021 ◽  
Vol 152 ◽  
pp. 104446
Author(s):  
Lina Russ ◽  
Carin Lombaers-van der Plas ◽  
Juan David Castillo-Russi ◽  
Carolien Zijlstra ◽  
Jürgen Köhl
Keyword(s):  
Powdery Mildew ◽  
Systems Approach ◽  
Causal Agent ◽  
Modes Of Action
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