scholarly journals Avaliação de danos causados por >i/i< no feijoeiro

2019 ◽  
Author(s):  
Marilene Tenguan Iamauti
Keyword(s):  
Uromyces Appendiculatus

scholarly journals Fungicidal Efficacy of Drying Plant Oils in Green Beans against Bean Rust (Uromyces appendiculatus)

Plants ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 143
Author(s):  
Vera Breiing ◽  
Jennifer Hillmer ◽  
Christina Schmidt ◽  
Michael Petry ◽  
Brigitte Behrends ◽  
...  
Keyword(s):  
Unsaturated Fatty Acids ◽  
Plant Protection ◽  
Linseed Oil ◽  
Uromyces Appendiculatus ◽  
Plant Oils ◽  
Bean Rust ◽  
Green Beans ◽  
Plant Oil ◽  
Water Emulsion ◽  
Tung Oil

As biorationals, plant oils offer numerous advantages such as being natural products, with low ecotoxicological side effects, and high biodegradability. In particular, drying glyceride plant oils, which are rich in unsaturated fatty acids, might be promising candidates for a more sustainable approach in the discussion about plant protection and the environment. Based on this, we tested the protective and curative efficacy of an oil-in-water-emulsion preparation using drying plant oils (linseed oil, tung oil) and a semi-drying plant oil (rapeseed oil) separately and in different mixtures. Plant oils were tested in greenhouse experiments (in vivo) on green beans (Phaseolus vulgaris L.) against bean rust (Uromyces appendiculatus). We observed that a 2% oil concentration showed no or very low phytotoxic effects on green beans. Both tested drying oils showed a protective control ranging from 53–100% for linseed oil and 32–100% for tung oil. Longer time intervals of 6 days before inoculation (6dbi) were less effective than shorter intervals of 2dbi. Curative efficacies were lower with a maximum of 51% for both oils when applied 4 days past inoculation (4dpi) with the fungus. Furthermore, the results showed no systemic effects. These results underline the potential of drying plant oils as biorationals in sustainable plant protection strategies.

Mendelian Inheritance of Teliospore Production in Uromyces appendiculatus

Mycologia ◽  
1997 ◽  
Vol 89 (4) ◽  
pp. 551 ◽  
Author(s):  
B. D. McCallum ◽  
J. V. Groth ◽  
A. P. Roelfs
Keyword(s):  
Mendelian Inheritance ◽  
Uromyces Appendiculatus

scholarly journals Isolates of Uromyces appendiculatus with Specific Virulence to Landraces of Phaseolus vulgaris of Andean Origin

Plant Disease ◽  
1999 ◽  
Vol 83 (2) ◽  
pp. 108-113 ◽  
Author(s):  
Craig M. Sandlin ◽  
James R. Steadman ◽  
Carlos M. Araya ◽  
Dermot P. Coyne
Keyword(s):  
Phaseolus Vulgaris ◽  
Rapd Analysis ◽  
Random Amplified Polymorphic Dna ◽  
Rust Fungus ◽  
Distinct Group ◽  
Uromyces Appendiculatus ◽  
Bean Rust ◽  
Banding Patterns ◽  
Highly Virulent ◽  
Specific Virulence

Five isolates of the bean rust fungus Uromyces appendiculatus were shown to be specifically virulent on bean genotypes of Andean origin. This specificity was demonstrated by the virulence of five pairs of isolates on a differential set of 30 Phaseolus vulgaris landraces. Each isolate pair was from a different country in the Americas and consisted of one Andean-specific isolate and one nonspecific isolate. Of the differential P. vulgaris landraces, 15 were of Middle American origin and 15 were of Andean origin. The Andean-specific rust isolates were highly virulent on Andean landraces but not on landraces of Middle American origin. Rust isolates with virulence to Middle American landraces were also generally virulent on Andean material; no truly Middle American-specific isolates were found. Random amplified polymorphic DNA (RAPD) analysis of the rust isolates also distinguished the two groups. Four of the Andean-specific rust isolates formed a distinct group compared to four of the nonspecific isolates. Two of the isolates, one from each of the two virulence groups, had intermediate RAPD banding patterns, suggesting that plasmagomy but not karyogamy occurred between isolates of the two groups.

scholarly journals Coinoculation Effects of the Pathogens Causing Common Bacterial Blight, Rust, and Bean Common Mosaic in Phaseolus vulgaris

1990 ◽  
Vol 115 (2) ◽  
pp. 319-323 ◽  
Author(s):  
H.Z. Zaiter ◽  
D.P. Coyne ◽  
J.R. Steadman
Keyword(s):  
Phaseolus Vulgaris ◽  
Bacterial Blight ◽  
Xanthomonas Campestris ◽  
Bean Common Mosaic Virus ◽  
Host Susceptibility ◽  
Uromyces Appendiculatus ◽  
Common Bacterial Blight ◽  
Dry Bean ◽  
Screening For Resistance ◽  
Prior Infection

Ten dry bean (Phaseolus vulgaris L.) cultivars/lines with differential reactions to rust were used in growth chamber experiments to determine rust [Uromyces appendiculatus (Pers.) Unger var. appendiculutus, (U a)], and common bacterial blight Xanthomonas campestris pv. phaseoli (E.F. Sm.) Dews. (X c p)] reactions on leaves when coinoculated with both pathogens. The X c p-U a necrosis symptoms were very different from those caused by X c p alone. Depending on the level of host susceptibility to rust, the X c p reaction remained confined within the rust pustule or spread beyond the pustule area, causing a necrosis of the entire leaf. Prior infection of bean seedlings with bean common mosaic virus (BCMV), NY-15 strain, reduced rust pustule size, but did not affect the reaction to X c p. Screening with X c p and BCMV can be done at the same time during the early vegetative stage, but the interactions of U a with X c p and of BCMV with U a need to be considered in screening for resistance.

Uromyces appendiculatus. [Descriptions of Fungi and Bacteria].

1965 ◽  
Author(s):  
G. F. Laundon
Keyword(s):  
United States ◽  
Sierra Leone ◽  
Geographical Distribution ◽  
World Wide ◽  
Indirect Evidence ◽  
Severe Infection ◽  
The United States ◽  
Total Loss ◽  
Uromyces Appendiculatus

Abstract A description is provided for Uromyces appendiculatus. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Dolichos, Phaseolus and Vigna species. DISEASE: Rust on leaves of French, Lima, and Scarlet Runner beans, and other Phaseolus spp., and cowpeas. The reddish-brown, circular sori may be surrounded by a yellow halo in some varieties. Complete defoliation and total loss of crop results in seasons favouring severe infection. GEOGRAPHICAL DISTRIBUTION: World-wide wherever beans are grown (CMI Map 290, Ed. 2, 1964). TRANSMISSION: By urediospores disseminated by wind, and through contact with animals including man and his implements. Indirect evidence of the possibility of introduction into Sierra Leone on seed imported from Ghana and S. Africa has been given by Deighton (25: 253). Some 40% of urediospores stored for 2 yr. at -60°C, and 16% stored more than 600 days at -18°C, have survived with virulence unimpaired, and it is thought that the rust is thus able to overwinter on bean trash and trellis poles in the United States (42: 167; 43, 299).

The Autogenic Extracellular Environment of Uromyces Appendiculatus Urediospore Germlings

Mycologia ◽  
1993 ◽  
Vol 85 (3) ◽  
pp. 392-400 ◽  
Author(s):  
Thomas D. Moloshok ◽  
Gabriele M. E. Leinhos ◽  
Richard C. Staples ◽  
Harvey C. Hoch
Keyword(s):  
Uromyces Appendiculatus ◽  
Extracellular Environment

The Autogenic Extracellular Environment of Uromyces appendiculatus Urediospore Germlings

Mycologia ◽  
1993 ◽  
Vol 85 (3) ◽  
pp. 392 ◽  
Author(s):  
Thomas D. Moloshok ◽  
Gabriele M. E. Leinhos ◽  
Richard C. Staples ◽  
Harvey C. Hoch
Keyword(s):  
Uromyces Appendiculatus ◽  
Extracellular Environment

scholarly journals Uromyces appendiculatus in Honduras: Pathogen Diversity and Host Resistance Screening

Plant Disease ◽  
2013 ◽  
Vol 97 (5) ◽  
pp. 652-661 ◽  
Author(s):  
Maricelis Acevedo ◽  
James R. Steadman ◽  
Juan C. Rosas
Keyword(s):  
Uromyces Appendiculatus ◽  
Bean Rust ◽  
Sources Of Resistance ◽  
Pathogen Diversity ◽  
Major Constraint ◽  
Sampling Locations ◽  
Significant Difference ◽  
High Incidence ◽  
The Mean ◽  
Virulence Diversity

Bean rust, caused by the fungus Uromyces appendiculatus, is a major constraint for common bean production worldwide. Virulence of U. appendiculatus collected from wild and cultivated Phaseolus spp. was examined in 28 locations across Honduras. Host accessions representing wild and domesticated Phaseolus spp. collected at the same sampling locations were evaluated for resistance against U. appendiculatus. In total, 91 pathotypes were identified from 385 U. appendiculatus isolates according to their virulence on each of the 12 host differentials. No significant difference in pathogen total virulence, measured as the mean disease score, was found between locations. However, significant differences were found in pathotype virulence among isolates collected from different Phaseolus spp. within a location. Moreover, when locations were compared on the basis of pathotype occurrence and frequency, differences among locations were evident. No two locations had the same pathotype composition. The most common pathotype was virulent on 9 of the 12 differential lines. A high number of resistant accessions were identified in Phaseolus coccineus and P. lunatus. Although most wild P. vulgaris accessions were highly susceptible, rust resistance was observed in P. vulgaris landraces collected from farmer's fields. Thirty-two (52%) of the accessions screened showed intermediate to high levels of resistance and, of those, 16% were P. coccineus accessions. Our findings support the hypothesis that interaction of U. appendiculatus in host populations composed of diverse Phaseolus spp. and genotypes has favored highly diverse and virulent pathotypes, creating a center for virulence diversity of the pathogen in Honduras. The high percentage of intermediate and highly resistant accessions identified in the present study supports the strategy of collecting plants from the center of diversity of a pathogen or in locations with high incidence of disease and pathogen diversity to maximize the probability of identifying new sources of resistance.

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