Basidiophora entospora. [Descriptions of Fungi and Bacteria].

1981 ◽  
Author(s):  
S. M. Francis
Keyword(s):  
New Zealand ◽  
Host Plant ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Leaf Surface ◽  
Chrysanthemum Morifolium ◽  
Plant Debris ◽  
Disease Symptoms ◽  
Conyza Bonariensis ◽  
Resting Spores

Abstract A description is provided for Basidiophora entospora. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Aster chilensis, A. cordifolius, A. douglasii, A. novae-angliae, A. novi-belgii, A. oblongifolius, A. puniceus, A. sagittifolius, Callistephus chinensis, Conyza bonariensis, C. canadensis, Erigeron philadelphicus, Felicia bergeriana, Rudbeckia speciosa, Solidago rigida. DISEASE: Downy mildew of asters. Seedlings in flats and plants in the open may be attacked. On Aster novae-angliae the fungus tends to infect along the midrib and the adjacent lamina becomes yellow and finaly brown. All lower leaves on these plants may die. The sporangiophores develop on the undersurface of these leaves and form a sparse white covering. The degree and type of infection differs with the host plant and on a variety of Aster novi-belgii the disease symptoms were recorded as lesions which spread diffusely over the leaf surface and showed very little necrosis (24, 5). Laboratory inoculations with spores of B. entospora showed it to be very pathogenic on leaves and stems of King asters (Callistephus chinensis) while flowers were not infected. The foliage of Chrysanthemum morifolium 'White Iceberg' was not susceptible to B. entospora (48, 328). GEOGRAPHICAL DISTRIBUTION: Asia (Iraq); Australasia (New Zealand); Europe (Britain, France, Germany, Hungary, Poland, Romania); N. America (Canada, USA); S. America (Ecuador). TRANSMISSION: No reports, but presumably by resting spores, which are formed freely in infected leaves, being carried in plant debris to the soil. In Canada the pathogen is found on the wild Aster cordifolius which may act as a reservoir of infection.

Peronospora anemones. [Descriptions of Fungi and Bacteria].

1981 ◽  
Author(s):  
S. M. Francis
Keyword(s):  
New Zealand ◽  
Botrytis Cinerea ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Primary Infection ◽  
Leaf Surface ◽  
Plant Debris ◽  
Lower Leaf Surface ◽  
Glass Slides ◽  
Secondary Infections

Abstract A description is provided for Peronospora anemones. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Anemone coronaria, A. globosa. DISEASE: Downy mildew of anemones. Infected leaves lose their natural bloom, appearing dull green, almost grey in colour and are often down curled giving the plant a rounded appearance. As the disease progresses, leaf colour may change to shades of pink or purple with necrotic areas appearing on the older leaves. Invasion by secondary organisms (e.g. Botrytis cinerea) is common, especially after frost or storm injury, and this accelerates plant death. In favourable conditions conidiophores develop forming a whitish-grey down on the lower leaf surface, on the bracts and, less frequently, on the petioles. It is not uncommon for affected plants to show little or no sporulation and in these cases the presence of extensive intercellular mycelium and, later in the season, oospores in petioles and peduncles helps diagnosis. GEOGRAPHICAL DISTRIBUTION: Australasia (New Zealand); Europe (England, Jersey, France, Italy, Netherlands). TRANSMISSION: Primary infection is caused by oospores in plant debris in the soil. Tramier (1963) was unable to germinate oospores and thus work out precise details of the conditions affecting their germination but he showed evidence that regular and prolonged rain encouraged germination. Conidia, which cause secondary infections, are dispersed by rain and during harvesting of the flowers. Wind is thought to be unimportant in their dissemination as shown by glass slides covered with vaseline and placed near an infected crop (Tramier, 1965).

Peronospora manshurica. [Descriptions of Fungi and Bacteria].

1981 ◽  
Author(s):  
S. M. Francis
Keyword(s):  
Glycine Max ◽  
Leaf Area ◽  
Geographical Distribution ◽  
Seed Coat ◽  
Leaf Surface ◽  
Ryukyu Islands ◽  
Plant Debris ◽  
Lower Leaf Surface ◽  
Bright Yellow ◽  
Resting Spores

Abstract A description is provided for Peronospora manshurica. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOST: soyabean (Glycine max). DISEASE: Downy mildew of soyabean. Small discrete pale to bright yellow spots (2-8 mm diam.) are formed on the upper leaf surface. The size of the spots varies both with the severity of the attack and with the race of pathogen involved (33, 525). In a heavy infection the whole leaf area is affected and shrivels and dies. The conidiophores form a greyish-purple down on the lower leaf surface beneath these spots. Pods can become infected, without showing external symptoms, and the seeds invaded. Oospores develop on the seed surface and appear as a milky white crust consisting of a mass of the hyaline spherical resting spores. Plants developing from oospore encrusted seed may be systemically infected, remain small and stunted and die early. GEOGRAPHICAL DISTRIBUTION: CMI Map No. 268, ed. 3, 1979. Latvia (Serzane, 1962), Ryukyu Islands (Nuttonson, 1952) and Sweden (Gustavsson, 1959) should be added. TRANSMISSION: Usually by seed infected with oospores which form a crust on the seed coat or, very rarely, on the cotyledons. The pathogen can also be spread by oospores remaining on plant debris in the soil. Systemically infected plants develop and the conidia which form on their leaves initiate infection in the surrounding crop. Method of detecting oospores on soyabean seed are described by Pathak et al. (57, 5214). Their studies also indicate that oospores on the seed may remain viable foe to 8 years.

Peronospora jaapiana. [Descriptions of Fungi and Bacteria].

1981 ◽  
Author(s):  
S. M. Francis
Keyword(s):  
New Zealand ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Leaf Surface ◽  
Leaf Material ◽  
Leaf Spots

Abstract A description is provided for Peronospora jaapiana. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Rheum officinale, R. palmatum, R. rhaponticum, R. undulatum. DISEASE: Downy mildew of rhubarb. Seedlings in cold frames and plants in the field may be attacked and heavy losses caused in cold, wet seasons. The fungus causes a severe spotting and eventual destruction of the leaves. Plants may be almost completely defoliated. The earliest symptoms are conspicuous yellowish spots of 1 cm or more diameter which appear on the upper leaf surface. These areas are at first delimited by the veins but in severe attacks they soon spread causing the veins to break and the leaves then fall to pieces. With age the leaf spots become dry and brown and very brittle. The condiophores which may be seen on the under surface of the leaves beneath the yellow spots in the earlier phases of the disease were sparingly produced in the material seen (IMI 251354) and resembled the downy mildew of rose, Peronospora sparsa, in this respect. They are reported as forming a grey to fawn downy growth in Australia when conditions are moist. GEOGRAPHICAL DISTRIBUTION: Asia (USSR (Estonia, Latvia)); Australasia (Australia, New Zealand); Europe (Britain, Denmark, France, Germany, Norway, Poland, Switzerland); N. America (Canada, USA). TRANSMISSION: No oospores have been reported for this species and the pathogen is said to perennate as mycelium in the young shoots of propagating roots (Chupp & Sherf, 1960). The hyphae of P. jaapiana contain unusually large amounts of glycogen which enables them to overwinter in decaying leaf material on the ground (Magnus, 1910).

Peronospora destructor. [Descriptions of Fungi and Bacteria].

1975 ◽  
Author(s):  
K. G. Mukerji
Keyword(s):  
South Africa ◽  
New Zealand ◽  
East Asia ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Wild Species ◽  
Peronospora Destructor ◽  
North East

Abstract A description is provided for Peronospora destructor. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Affects species of Allium; common on A. cepa, rarer on A. ascalonicum, A. fistulosum, A. porrum, A. sativum, A. schoenoprasum, and a few wild species. DISEASE: Downy mildew (mildiou, falscher Mehitau) of onion. GEOGRAPHICAL DISTRIBUTION: On onion in all parts of Europe and America; north, east and south Africa, west, south and east Asia, Australia, New Zealand; and Tasmania. On other Allium crops in a few countries in Europe and on other continents (CMI Map 76. ed. 3, 1969).

Septoria antirrhini. [Descriptions of Fungi and Bacteria].

2004 ◽  
Author(s):  
T. V. Andrianova
Keyword(s):  
South Africa ◽  
Czech Republic ◽  
New Zealand ◽  
Great Britain ◽  
South America ◽  
Geographical Distribution ◽  
Infected Plant ◽  
Weather Conditions ◽  
Plant Debris ◽  
Wet Weather

Abstract A description is provided for Septoria antirrhini. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Leaf spot, leaf drying, defoliation. HOSTS: Antirrhinum antirrhiniflorum, A. majus, A. siculum (Scrophulariaceae). GEOGRAPHICAL DISTRIBUTION: AFRICA: South Africa. NORTH AMERICA: Canada, USA. SOUTH AMERICA: Chile, Colombia. ASIA: Armenia, Azerbaijan, China, Iran, Israel. AUSTRALASIA: Australia, New Zealand. EUROPE: Bulgaria, Czech Republic, Estonia, France, Germany, Great Britain, Hungary, Ireland, Italy, Netherlands, Portugal, Romania, Ukraine, former Yugoslavia. TRANSMISSION: Not reported, but almost certainly by airborne, splash-dispersed conidia from infected plant debris and seed stocks. The disease is significantly more severe under wet weather conditions (SINADSKIY et al., 1985).

Ulocladium atrum. [Descriptions of Fungi and Bacteria].

1995 ◽  
Author(s):  
J. C. David
Keyword(s):  
Saudi Arabia ◽  
New Zealand ◽  
Sierra Leone ◽  
Geographical Distribution ◽  
Wind Dispersal ◽  
Plant Debris ◽  
Airborne Conidia

Abstract A description is provided for Ulocladium atrum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Wood, seeds, stems, leaves of many different plants, soil. DISEASE: None. GEOGRAPHICAL DISTRIBUTION: Africa: Egypt, Libya, Sierra Leone. N. America: Canada, USA (California, Colorado, Kansas). S. America: Argentina, Chile. Asia: India, Iraq, Israel, Kuwait, Pakistan, Saudi Arabia, Turkey. Australasia: Australia (WA, VIC), New Zealand. Europe: Cyprus, Netherlands, Norway, Portugal, UK. TRANSMISSION: By wind dispersal of airborne conidia, and possibly through water, soil and plant debris.

Arthrinium phaeospermum. [Descriptions of Fungi and Bacteria].

1991 ◽  
Author(s):  
P. M. Kirk
Keyword(s):  
South Africa ◽  
New Zealand ◽  
North America ◽  
South America ◽  
Sierra Leone ◽  
Geographical Distribution ◽  
Peninsular Malaysia ◽  
Potato Tubers ◽  
Plant Debris ◽  
Arthrinium Phaeospermum

Abstract A description is provided for Arthrinium phaeospermum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Agropyron, Ammophila, Anona, Araucaria, Arundinaria, Arachis, Argemone, Arrhenatherum, Arundo, Bambusa, Brassica, Bromus, Calamagrostis, Carex, Cocos, Citrus, Cladium, Coelogyne, Coffea, Cortaderia, Cratueva, Dactylis, Dendrocalamus, Dioscorea, Eleusine, Elymus, Fagus, Fragaria, Glyceria, Gynerium, Hedera, Hordeum, Justicia, Lens, Liriope, Lycopersicon, Magnolia, Malus, Maranta, Musa, Nicotiana, Oryza, Panicum, Persea, Phalaris, Phaseolus, Pinus, Pisum, Phragmites, Phyllostachys, Picea, Pinus, Piper, Prunus, Psamma, Pteridium, Ranwolfia, Saccharum, Smilax, Solanum, Sorghum, Tectona, Theobroma, Trifolium, Triticum, Valeriana, Vigna, Vitis, Zea; also from air, animals (including man), soil and plant debris, straw, silage and wood. DISEASE: None as a primary pathogen of plants; frequently encountered as a secondary invader (of potato tubers) or as a saprophyte. GEOGRAPHICAL DISTRIBUTION: AFRICA: Algeria, Kenya, Malawi, Nigeria, Sierra Leone, South Africa Spain (Canary Islands), Sudan, Tanzania, Zambia, Zimbabwe. ASIA: Bangladesh, Bhutan, Hong Kong, India, Iraq, Japan, Nepal, Pakistan, Malaysia (Peninsular Malaysia), Philippines, Thailand. AUSTRALASIA & OCEANIA: Australia, Guadalcanal, New Zealand. EUROPE: Cyprus, Eire, Germany, Greece, Netherlands, Portugal, Spain, Sweden, Turkey, UK. NORTH AMERICA: Canada, USA. SOUTH AMERICA: Argentina. TRANSMISSION: By unknown means.

Nigrospora sphaerica. [Descriptions of Fungi and Bacteria].

1991 ◽  
Author(s):  
P. M. Kirk
Keyword(s):  
South Africa ◽  
New Zealand ◽  
Central America ◽  
Sierra Leone ◽  
Papua New Guinea ◽  
Geographical Distribution ◽  
West Indies ◽  
Peninsular Malaysia ◽  
Plant Debris ◽  
Windward Islands

Abstract A description is provided for Nigrospora sphaerica. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Abelmoschus, Acacia, Acropera, Album, Ananas, Anthurium, Amaranthus, Andropogon, Arachis, Aralia, Araucaria, Areca, Argemone, Artocarpus, Arundinaria, Asparagus, Axonopus, Bambusa, Banhinia, Bridelia, Brassica, Cajanus, Calamus, Calotropis, Camellia, Capsicum, Cardamomum, Carex, Carica, Coriandrum, Cenchrus, Centrosema, Chasmopodium, Chloris, Cicer, Cinnamomum, Citrullus, Citrus, Cocos, Coffea, Coix, Cola, Colea, Coriandrum, Crotalaria, Cucumis, Culcasia, Cupressus, Cymbopogon, Cyperus, Dianthus, Dichanthium, Dioscorea, Elaeis, Emblica, Erianthus, Eriobotrya, Eucalyptus, Euphorbia, Feronia, Ficus, Fragaria, Gladiolus, Glycine, Gomphrena, Gossypium, Hevea, Hibiscus, Hordeum, Hydrangea, Hymantrudae, Hyparrhenia, Ipomoea, Jatropha, Lactuca, Luffa, Lycopersicon, Macadamia, Mormodica, Morus, Lathyrus, Malus, Mangifera, Musa, Nicotiana, Neomarica, Nephelium, Nothofagus, Oncidium, Ophiuros, Oryza, Oxytenanthera, Panicum, Papaver, Pelargonium, Pennisetum, Pueraria, Phalaenopsis, Phaseolus, Phragmites, Physalis, Pinus, Piper, Pistia, Populus, Prunus, Pseudotsuga, Psidium, Psophocarpus, Pyrethrum, Raphanus, Ricinus, Robinia, Rosa, Rottboellia, Saccharum, Salvia, Shorea, Solanum, Sorghum, Sporobolus, Sphenoclea, Stevia, Stigmaphyllon, Strychnos, Tabebuia, Tabemaemontana, Theobroma, Trichosanthes, Trigonella, Triticum, Vicia, Vitex, Xanthosoma, Zea, Zizyphus; also from air, animals (including man and Ceroplastus), soil and plant debris, and stored foods. DISEASE: None as a primary pathogen of plants; frequently encountered as a secondary invader or as a saprophyte. Associated with 'squirter' and 'black end' disease of banana. GEOGRAPHICAL DISTRIBUTION: AFRICA: Cameroon, Egypt, Ethiopia, Ghana, Guinea, Kenya, Madagascar, Malawi, Mauritius, Mozambique, Nigeria, Seychelles, Sierra Leone, South Africa, Spain (Canary Islands), Sudan, Tanzania, Togo, Uganda, Zambia, Zimbabwe. ASIA: Bangladesh, Brunei, Burma, Hong Kong, India, Indonesia, Iraq, Nepal, Pakistan, Malaysia (Peninsular Malaysia, Sabah), Philippines, Sarawak, Sri Lanka, Syria. AUSTRALASIA & OCEANIA: Australia, Fiji, Guadalcanal, New Zealand, Norfolk Islands, Papua New Guinea, Tonga. EUROPE: Italy, Turkey, UK. NORTH AMERICA: Canada, USA. CENTRAL AMERICA & WEST INDIES: Cuba, Honduras, Jamaica, Trinidad, Windward Islands. SOUTH AMERICA: Argentina, Bolivia, Brazil, Chile, Peru, Venezuela. TRANSMISSION: By unknown means.

scholarly journals First Report of Downy Mildew Caused by Plasmopara halstedii on Black-eyed Susan (Rudbeckia fulgida cv. ‘Goldsturm’) in Maryland

Plant Disease ◽  
2014 ◽  
Vol 98 (7) ◽  
pp. 1005-1005 ◽  
Author(s):  
Y. Rivera ◽  
K. Rane ◽  
J. A. Crouch
Keyword(s):  
Downy Mildew ◽  
Leaf Surface ◽  
Control Plant ◽  
Morphological Data ◽  
Economic Losses ◽  
Morphological Identification ◽  
Post Inoculation ◽  
Disease Symptoms ◽  
Plasmopara Halstedii ◽  
First Report

The North American perennial black-eyed Susan (Rudbeckia fulgida cv. Goldsturm) is an important nursery crop, prized by gardeners and landscapers for its persistent bloom and ease of cultivation. In September 2013, disease symptoms characteristic of downy mildew were observed from multiple R. fulgida plants at two commercial nurseries in the Maryland counties of Howard and Anne Arundel. Over 100 R. fulgida were affected by this disease in both nurseries, rendering the plants unmarketable and causing a substantial financial loss. Plants exhibited dark necrotic lesions on the adaxial leaf surface, and sporulating masses of white mycelium on the abaxial leaf surface and on the adaxial in extreme infections. Plants were stunted with a reduced number of blooms. Microscopic visualization showed coenocytic mycelium, hyaline sporangiophores (length 261 to 904 μm; [Formula: see text] = 557 μm; n = 20) that were straight and monopodially branched at right angles with several terminal branchlets. Sporangia were hyaline, ovoid to elliptical with smooth surfaces ([Formula: see text] = 31 × 28 μm; n = 50). Based on morphological data, the organism was identified as Plasmopara halstedii (Farl.) Berl. & De Toni in Sacc (2). Voucher specimens were deposited in the U.S. National Fungus Collections (BPI 892792 to 892794). Molecular identification was conducted by extracting genomic DNA from sporangiophores and mycelium tweezed from the surface of three infected plants, with extractions performed using the QIAGEN Plant DNA kit (QIAGEN, Gaithersburg, MD). The large subunit of the nuclear rDNA was amplified by PCR using primers LROR and LR7 (3) and sequenced bidirectionally. BLASTn searches of NCBI GenBank showed that the resultant rDNA sequences (accessions KF927152 to KF927154) shared 99% nucleotide identity with curated P. halstedii sequences, consistent with morphological identification. To confirm pathogenicity, three 3.78-liter (1 gallon) containerized R. fulgida cv. Goldsturm plants were inoculated with a sporangial suspension of 2.4 × 104 sporangia/ml and sprayed until both the upper and lower surface of the leaves were completely covered. One negative control plant was sprayed with deionized water. Plants were placed in clear plastic bags in a growth chamber (20°C, 12-h photoperiod). Disease symptoms were observed 3 days post inoculation on all plants. The control plant was symptomless. Morphological features of the pathogen on the surface of inoculated plants were identical to those observed from the original infected plants. Although P. halstedii on R. fulgida cv. Goldsturm has been previously reported in Virginia in 2006 and Florida in 2004, to our knowledge, this is the first report on R. fulgida cv. Goldsturm in Maryland (1). Black-eyed Susans are widely distributed throughout Maryland's landscape and are a staple plant for gardeners, nurserymen and landscape professionals. Given the destructive nature of this disease, downy mildew has the potential to cause considerable economic losses to the state's ornamental crop industry. References: (1) D. F. Farr and A. Y. Rossman. Fungal Databases, Syst. Mycol. Microbiol. Lab., ARS, USDA. Retrieved from http://nt.ars-grin.gov/fungaldatabases/ , November 18, 2013. (2) P. A. Saccardo. Syllogue Fungorum 7:242, 1888. (3) R. Vilgalys and M. Hester. J. Bacteriol. 172:4238, 1990.

Apiospora montagnei. [Descriptions of Fungi and Bacteria].

1991 ◽  
Author(s):  
P. M. Kirk
Keyword(s):  
New Zealand ◽  
Central America ◽  
Sierra Leone ◽  
Papua New Guinea ◽  
Geographical Distribution ◽  
West Indies ◽  
Solomon Islands ◽  
Peninsular Malaysia ◽  
Plant Debris ◽  
Windward Islands

Abstract A description is provided for Apiospora montagnei. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Acer, Agropyron, Ammophila, Andropogon, Arachis, Areca, Aristida, Arundinaria, Bambusa, Brassica, Capsicum, Carex, Chrysanthemum, Cicer, Cinnamomum, Coffea, Colocasia, Coriandrum, Cortaderia, Cucumis, Cupressus, Cynodon, Cyperus, Dactylis, Dendrocalamus, Desmostachya, Deschampsia, Dioscorea, Dolichos, Donax, Elaeis, Elymus, Eucalyptus, Eugenia, Fagus, Ficus, Fragaria, Fraxinus, Gossypium, Hippocratea, Holcus, Hordeum, Hyparrhenia, Ilex, Lactuca, Lens, Leucaena, Lycopersicon, Malus, Manihot, Musa, Myrica, Nectandra, Nicotiana, Ochlandra, Oryza, Oxytenanthera, Phalaris, Phenacoccus, Phragmites, Pinus, Pisum, Prunus, Psamma, Pseudotsuga, Pyrus, Ricinus, Rottboellia, Saccharum, Sambucus, Sesamum, Solanum, Sorindeia, Spartinia, Spiraea, Stylosanthes, Themeda, Theobroma, Triticum, Urtica, Vigna, Vitis, Zea; also from air, animals, hay, food (bread, dried peas), molasses, soil and plant debris. DISEASE: None as a primary pathogen of plants; frequently encountered as a secondary invader or as a saprophyte. GEOGRAPHICAL DISTRIBUTION: AFRICA: Gambia, Ghana, Kenya, Malawi, Mauritius, Namibia, Nigeria, Portugal (Azores), Sierra Leone, Tanzania, Togo, Uganda, Zambia, Zimbabwe. ASIA: Burma, China, Hong Kong, India, Indonesia, Japan, Nepal, Pakistan, Papua New Guinea, Malaysia (Peninsular Malaysia, Sabah), Philippines, Sri Lanka, Thailand. AUSTRALASIA & OCEANIA: Australia, Fiji, New Zealand, Solomon Islands, USA (Hawaii). EUROPE: Belgium, Cyprus, Czechoslovakia, Eire, France, Germany, Greece, Italy, Netherlands, Portugal, Rumania, Spain, Sweden, Turkey, UK, USSR. NORTH AMERICA: Canada, USA. CENTRAL AMERICA & WEST INDIES: Cuba, Jamaica, Windward Islands. SOUTH AMERICA: Argentina, Venezuela. TRANSMISSION: By unknown means.

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