Race identification in powdery mildew ( Sphaerotheca fuliginea ) on melon ( Cucumis melo ) in Japan

1999 ◽  
Vol 118 (3) ◽  
pp. 259-262 ◽  
Author(s):  
K. Hosoya ◽  
K. Narisawa ◽  
M. Pitrat ◽  
H. Ezura
Keyword(s):  
Powdery Mildew ◽  
Cucumis Melo ◽  
Sphaerotheca Fuliginea ◽  
Race Identification

scholarly journals Potential Sources of Resistance to Fusarium Wilt and Powdery Mildew in Melons

HortScience ◽  
2005 ◽  
Vol 40 (6) ◽  
pp. 1657-1660 ◽  
Author(s):  
José María Alvarez ◽  
Rafael González-Torres ◽  
Cristina Mallor ◽  
María Luisa Gómez-Guillamón
Keyword(s):  
Powdery Mildew ◽  
Fusarium Oxysporum ◽  
Fusarium Wilt ◽  
Cucumis Melo ◽  
Wild Relatives ◽  
Natural Resistance ◽  
Sphaerotheca Fuliginea ◽  
Sources Of Resistance ◽  
Potential Sources ◽  
Artificial Inoculations

In total, 139 Cucumis melo accessions were evaluated for resistance to races 0, 1, and 2 of Fusarium oxysporum fsp. melonis and 127 accessions were evaluated for resistance to races 1 and 2 of Sphaerotheca fuliginea. In addition, seven C. melo wild relatives were also tested. Artificial inoculations were performed and plants were scored for presence or absence of symptoms. The screening revealed that sources of natural resistance to these fungi are limited. However, several sources of resistance were found in C. melo accessions. Thus, the accession `CUM-334' from Tajikistan has shown resistance to the three races of F. oxysporum fsp. melonis, behaving similarly to the melon inbred line `MR1'. Two accessions of C. melo var. conomon, `CUM-190' and `Shiroubi Okayama', from Japan, were resistant to races 0 and 1 and twelve accessions were resistant to races 0 and 2. Intra-specific variability for resistance to powdery mildew in C. melo was found to be poor. Nevertheless, six Spanish cultivars and the accessions `TGR-1551', `CUM-313', and `CUM-129' were resistant to races 1 and 2 of S. fuliginea.

scholarly journals Genes for Resistance to Powdery Mildew Races 1 and 2U.S. in Melon PI 313970

HortScience ◽  
2003 ◽  
Vol 38 (4) ◽  
pp. 591-594 ◽  
Author(s):  
James D. McCreight
Keyword(s):  
Powdery Mildew ◽  
Cucumis Melo ◽  
Powdery Mildew Resistance ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Sphaerotheca Fuliginea ◽  
Limited Data ◽  
Race 1 ◽  
Resistance Reaction ◽  
Greenhouse Tests

Powdery mildew is a major problem in melon (Cucumis melo L.) production worldwide. Three genes for resistance to Sphaerotheca fuliginea (Schlecht. ex Fr.) Poll. race 1 and race 2U.S. were identified in growth chamber and greenhouse tests in the cross of PI 313970 × `Top Mark'. A recessive gene conditioned resistance of true leaves to race 1. A recessive gene appeared to condition resistance of cotyledons to race 2U.S., although a second recessive gene may be involved. A semi-dominant gene conditioned resistance of true leaves to race 2U.S. Limited data suggested linkage of the recessive gene for resistance to race 1 and the semi-dominant gene for resistance to race 2U.S. The resistance reaction of PI 313970 to infection of true leaves by race 2U.S. included water-soaked spots and resistant blisters, but segregation data for the resistant blister reaction were inconclusive. Allelic relationships of these genes with previously reported melon powdery mildew resistance genes remain to be determined.

scholarly journals Melon-Powdery Mildew Interactions Reveal Variation in Melon Cultigens and Podosphaera xanthii Races 1 and 2

2006 ◽  
Vol 131 (1) ◽  
pp. 59-65 ◽  
Author(s):  
James D. McCreight
Keyword(s):  
Powdery Mildew ◽  
Virulence Factors ◽  
Cucumis Melo ◽  
Podosphaera Xanthii ◽  
Sphaerotheca Fuliginea ◽  
Race 1 ◽  
New Races ◽  
Race 2 ◽  
Serious Disease ◽  
Greenhouse Tests

Powdery mildew is a serious disease of melon (Cucumis melo L.) worldwide. Twenty-two melon cultigens have been used to define 22 reported races of the pathogen Podosphaera xanthii (sect. Sphaerotheca) xanthii (Castag.) U. Braun & N. Shish. Comb. nov. [syn. Sphaerotheca fuliginea (Schlecht. ex Fr.) Poll.]. Discrepancies in the reactions of eight cultigens to populations of P. xanthii races 1 and 2 in California, Japan, and Spain revealed genetic differences among them that can be used to differentiate P. xanthii race 1 and 2 populations in these countries. Implicit in these results is the existence of previously unknown virulence factors in these populations of P. xanthii races 1 and 2 that permit designation of new races of P. xanthii on melon. Synthesis of these results with previous reports resulted in the identification of 28 putative races of P. xanthii on melon that include eight variants of race 1 and six variants of race 2. Six of the cultigens exhibited resistant blisters in response to heavy infection by P. xanthii in field and greenhouse tests.

Incidence of powdery mildew on cucurbit plants in Katsina, Nigeria

2019 ◽  
pp. 05-09
Keyword(s):  
Powdery Mildew ◽  
Low Cost ◽  
Frequency Of Occurrence ◽  
Sphaerotheca Fuliginea ◽  
Causal Organism ◽  
Powdery Mildews ◽  
Powdery Mildew Disease ◽  
Important Disease

The presence study deals with powdery mildews in various cucurbits in Katsina city (Barhim Estate, Kofar Durbi, Kofar Sauri, Kofar Marusa and Low Cost), Nigeria. The finding shows that the areas infested with powdery mildew is one of the important disease of cucurbits. The Sphaerotheca fuliginea was identified to be the causal organism present on all observed cucurbits in the study. Highest frequency of disease was found in Kofar Sauri(79%) fallowed by Kofar Marusa (68%), Kofar Durbi (66%), Barhim Estate (65%) and the lowest frequency of occurrence of disease was found in Low Cost (55%).The intensity of the disease was moderate to severe in general but it was high in many fields, the area-wise variation was also noticed. On vegetables, the highest frequency of occurrence of powdery mildew disease was observed on L. cylindrica (76.4%) followed by C. moschata (60%), C. sativus (59.3%), C. vulgaris (53.9%) and lowest was found on C. melo (44.4%). The highest intensity of disease was found on C. moschata, followed by L. cylindrica, C. sativus, C. vulgaris and C. melo.

First Report of Powdery Mildew of Kalanchoe blossfeldiana caused by Sphaerotheca fuliginea (Podosphaera fuliginea) in the Pacific Northwest

2003 ◽  
Vol 4 (1) ◽  
pp. 39
Author(s):  
Dean A. Glawe ◽  
Rita Hummel ◽  
Grace Jack
Keyword(s):  
Powdery Mildew ◽  
Pacific Northwest ◽  
Sphaerotheca Fuliginea ◽  
First Report ◽  
Major Disease ◽  
The Pacific ◽  
Kalanchoe Blossfeldiana ◽  
Extension Center ◽  
Kalanchoë Blossfeldiana

Kalanchoe blossfeldiana Poelln. is a common ornamental houseplant. Although powdery mildew is a major disease of this species, there are no published reports of it in the Pacific Northwest. In August, 2002, powdery mildew was observed on six indoor K. blossfeldiana plants in an office and adjacent laboratory at the Puyallup Research and Extension Center. Accepted for publication 25 March 2003. Published 17 April 2003.

Sphaerotheca fuliginea. [Descriptions of Fungi and Bacteria].

1967 ◽  
Author(s):  
J. N. Kapoor
Keyword(s):  
Glycine Max ◽  
Powdery Mildew ◽  
Geographical Distribution ◽  
World Wide ◽  
Solanum Melongena ◽  
Sphaerotheca Fuliginea ◽  
Hibiscus Esculentus

Abstract A description is provided for Sphaerotheca fuliginea. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On numerous genera of Compositae, Cucurbitaceae and Scrophulariaceae. Also on Helianthemum spp. (Cistaceae); Arabis spp., Braya spp., Capscila spp., Cardaminc spp., Draba spp., Parrya spp. (Cruciferae); Dipsacus spp. (Dipsacaceae); Astragalu, spp., Glycine max, Phascolus spp., Rhynchosia spp., Vigna spp.(Leguminosae); Plantago spp. (Plantaginaceae); Hibiscus esculentus (Malvaceae); Hyoscyarnus niger, Mandragora officinalis, Petunia spp., Physalis spp., Solanum melongena (Solanaceae). (Blumer, 1967; Hirata, 1966). DISEASE: Powdery mildew of cucurbits. GEOGRAPHICAL DISTRIBUTION: World-wide. TRANSMISSION: Not known.

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