Phacidium infestans. [Descriptions of Fungi and Bacteria].

Author(s):  
D. W. Minter

Abstract A description is provided for Phacidium infestans. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Pinus sylvestris. DISEASE: Snow blight of pine. Ascospores released in September and October (45, 774) infect current year's needles. The depth of snow cover the following winter determines the proportion of needles showing symptoms (39, 250) which are, the following spring, a distinctive reddish-brown resulting from the destruction of chlorophyll (40, 635). Apothecia are produced on the discoloured needles, and usually complete the cycle in one year. Disease severity may be lessened by other ground vegetation, especially Calluna vulgaris and Vaccinium spp. (50, 2009). GEOGRAPHICAL DISTRIBUTION: Asia (Turkey, USSR: Siberia), Europe (Finland, France, Norway, Sweden, USSR: Estonia). TRANSMISSION: By air-borne ascospores in humid or wet weather.

Author(s):  
D. W. Minter

Abstract A description is provided for Lophodermium seditiosum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Pinus sylvestris, P. resinosa, P. nigra, P. montezumae, P. halepensis, P. virginiana. Probably on other pines also. DISEASE: Needle cast of pines. Lophodermium seditiosum is the serious Lophodermium pathogen; it infects young needles and kills them, causing discoloration and often 'drooping' symptoms. When attack is severe the seedling or young tree may die. GEOGRAPHICAL DISTRIBUTION: Widespread in Europe, USA (notably Christmas tree growing areas including Michigan, Oregon and Washington). TRANSMISSION: By air-borne ascospores in wet weather/humid conditions.


Author(s):  
D. W. Minter

Abstract A description is provided for Elytroderma deformans. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Pinus banksiana, P. contorta var. latifolia, P. echinata, P. edulis, P. jeffreyi, P. ponderosa. DISEASE: Witch's broom of pine. Trees of all ages, but mainly those over eleven years old and up to six metres high can be attacked. Current year needles are infected, and gradually discolour (though parts may remain green) over the winter, the discoloration being most marked by the following May, when the imperfect stage is formed. Ascocarps begin to form in June and ascospores are shed over the following winter, with a peak in October corresponding to the start of the rains. Needles killed by the disease are usually shed at about this time. Needles older than one year seem to be immune from infection. Shoots bearing infected needles form characteristic witch's brooms usually about 60 cm diam., but occasionally up to 2 m diam. Unusual resin cysts may be found in the phloem zone of the bark of these brooms, and the fungal hyphae can permeate the woody tissues. GEOGRAPHICAL DISTRIBUTION: North America (Canada: British Columbia, North West Territories, Ontario, USA; Arizona, California, Colorado, Idaho, Montana, Oregon, Washington). TRANSMISSION: By air-borne ascospores in humid or wet weather, also apparently from infected needles, by hyphal growth through the woody tissues into the buds.


Author(s):  
C. S. Millar

Abstract A description is provided for Lophodermella sulcigena. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Pinus sylvestris, P. mugo, P. nigra var. maritima, P. contorta. DISEASE: Pine needle blight, leading to premature needle cast; 'Swedish pine cast'. GEOGRAPHICAL DISTRIBUTION: Europe. Records from Czechoslovakia, Estonian SSR, Finland, Germany, Norway, Switzerland, Sweden, UK, USSR, Yugoslavia. TRANSMISSION: By air-borne ascospores in humid/wet weather.


2020 ◽  
Vol 73 ◽  
pp. S191
Author(s):  
Priyanka Jain ◽  
S Muralikrishna Shasthry ◽  
Ashok Choudhury ◽  
Guresh Kumar ◽  
Ankit Bhardwaj ◽  
...  

Author(s):  
D. W. Minter

Abstract A description is provided for Pseudohelotium pineti found on dead and whitened needles of Pinus sylvestris. Some information on its morphology, habitats, dispersal and transmission and conservation status is given, along with details of its geographical distribution (Canada (Manitoba, Sasktachewan), USA (Maryland, New Hampshire, New York, North Carolina, Pennsylvania, Virginia), India (Jammu and Kashmir), Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Italy, Netherlands, Norway, Poland, Russia (Komi Republic, Leningrad Oblast, Pskov Oblast, Republic of Karelia), Spain, Sweden, Switzerland, Ukraine and UK) and hosts (Pinus spp.).


Author(s):  
E. Punithalingam

Abstract A description is provided for Ascochyta desmazieresii. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Lolium multiflorum and L. perenne. DISEASE: Glume and leaf spot of Italian and perennial ryegrasses. At first leaf lesions start as small purplish or chocolate-brown spots with a distinct red-purple margin. With time these enlarge, become irregular or elliptical, up to 5 mm long and distinctly visible on both sides of the leaves. Finally the centres of older lesions fade to fawn to straw yellow with numerous pycnidia immersed within the leaf tissue on both sides of the leaves but usually abundant pycnidia occur on the lower side. GEOGRAPHICAL DISTRIBUTION: Asia (Japan); Europe (Belgium, Czechoslovakia, Denmark, France, Irish Republic, UK); N. America (USA, California, Oregon, Washington); S. America (Chile, Brazil). TRANSMISSION: No specific studies reported; infection is presumably spread by air-borne conidia in wet weather or heavy dews. The fungus is also probably carried over on crop residues and debris in soil.


Author(s):  
T. V. Andrianova

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).


2019 ◽  
Vol 12 (1) ◽  
pp. 132-140 ◽  
Author(s):  
V Sirgedaite-Šežiene ◽  
L Baležentiene ◽  
I Varnagiryte-Kabašinskiene ◽  
V Stakenas ◽  
V Baliuckas

Author(s):  

Abstract A new distribution map is provided for Bursaphelenchus vallesianus Braasch et al. Host: Scots pine (Pinus sylvestris). Information is given on the geographical distribution in Europe (Czech Republic, Germany, Greece and Switzerland) and Asia (China, Zhejiang, Turkey).


Author(s):  
E. Punithalingam

Abstract A description is provided for Ascochyta allii-cepae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Allium cepa cv. Hygro, A. cepa cv. Jumbo (Alliaceae/Liliaceae). DISEASE: Leaf tip blotch and die back of onion (65, 490). GEOGRAPHICAL DISTRIBUTION: Europe (U.K.). TRANSMISSION: Presumably by water dispersed conidia during wet weather.


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