scholarly journals EFEITO DE DIFERENTES FUNGICIDAS NO CONTROLE DE FERRUGEM E OÍDIO NAS CULTIVARES "CARIOCA" E "GOIANO PRECOCE" DE FEIJOEIRO COMUM

1994 ◽  
Vol 24 (2) ◽  
pp. 261-264
Author(s):  
Ricardo Silveiro Balardin
Keyword(s):  
Erysiphe Polygoni ◽  
Uromyces Phaseoli

RESUMO Este experimento foi conduzido com o objetivo de avaliar a eficiência do Tiofanato Metílico, Chorotalonil e Tiofanato Metílico + Clorothalonil no controle de ferrugem (Uromyces phaseoli) e oídio (Erysiphe polygoni) nas cultivares "Carioca" e "Goiano Precoce" de feijoeiro comum. O delineamento experimental foi o de blocos ao acaso com oito tratamentos e quatro repetições. A aplicação dos fungicidas foi feita com atomizador do tipo costal e volume de calda de 300 litros/hectare. Os estádios da cultura em que foram realizadas as aplicações foram V4 (terceira folha trifoliolada), R5 (pré-floração) e R8 (enchimento de vagens). Os parâmetros utilizados para avaliação foram o rendimento de grãos e severidade das doenças. A aplicação de fungicidas possibilitou uma redução acentuada na severidade das doenças e um aumento no rendimento de grãos.

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.

WATER RELATIONS OF ASEXUAL SPORES OF SPHAEROTHECA MACULARIS (WALLR. EX. FR.) COOKE AND ERYSIPHE POLYGONI DC.

1965 ◽  
Vol 11 (3) ◽  
pp. 531-538 ◽  
Author(s):  
J. S. Jhooty ◽  
W. E. McKeen
Keyword(s):  
Relative Humidity ◽  
Water Content ◽  
Osmotic Pressure ◽  
Water Relations ◽  
Erysiphe Polygoni ◽  
Significant Change ◽  
Sphaerotheca Macularis ◽  
Glass Surfaces

The conidia of Sphaerotheca macularis germinate best at a relative humidity (R.H.) of 99 and 100% on glass surfaces, and germination does not occur if the R.H. is below 93%. Conidia of Erysiphe polygoni DC. germinate at 3% R.H. The water content of conidia of S. macularis and E. polygoni is 53 and 69% respectively. The osmotic pressure of S. macularis conidia is about 18 atm and their density varies from 1.10 to 1.11 g/ml. There is no significant change in the diameter and length of the conidia during germination.

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
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