1202 



MANUAL OF DETERMINATIVE BACTERIOLOGY 



fig; F. altissima Blume; F. Jcrishna; and 

 F. tsiela Roxb. 



Geographical distribution : United 

 States (California, Texas), England, 

 Puerto Rico, China, New South Wales, 

 Western Australia. 



Induced disease : In fig, systemic chlo- 

 rotic spotting and mottling of foliage ; 

 some severe leaf distortion. Fruits some- 

 times afi"ected, bearing light circular 

 areas, rusty spots, being deformed or 

 dropped prematurely. Necrotic lesions 

 on profichi of Samson caprifigs also have 

 been attributed to action of this virus. 



Transmission : By budding. No insect 

 vector is known; mites have been sus- 

 pected as possible vectors. 



Literature: Condit and Home, Phyto- 

 path., 23, 1933, 887-896; 31, 1941, 561- 

 563 ; 33, 1943, 719-723 ; Ho and Li, Lingnan 

 Science Jour., 15, 1936, 69-70; Pittman, 

 W. Austral. Dept. Agr. Jour., 12, 1935 

 196. 



67. Marmor italicum (Fawcett) comh. 

 nov. {Citrivir italicum Fawcett, Phyto- 

 path., 31, 1941, 357.) Specific epithet 

 meaning "pertaining to Italy." 



Common name : Citrus infectious-mot- 

 tling virus. 



Host: RU T ACE AE— Citrus auran- 

 tium L., sour orange. 



Geographical distribution : Italy. 



Induced disease : In sour orange, white, 

 pale green, or yellow irregular areas in 

 leaves, leaving narrow green bands along 

 midrib; leaves blistered and distorted. 



Transmission : The aphid, Toxoptera 

 aurantii (Phytopath., 2J^, 1934, 661), has . 

 been suspected as vector. 



Literature: Fawcett, Phytopath., 31, 

 1941, 356-357; Petri, Bol. Staz. Pat. Veg. 

 Roma, n. s. 11, 1931, 105-114. 



Note : Several additional species were 

 described too late for complete systematic 

 treatment here. They are plain's wheat 

 mosaic virus, Marmor campestre 

 McKinney (Jour. Washington Acad. Sci., 

 SJj., 1944, 324) with varieties iypicum 

 McKinney and galhinmn McKinney, re- 

 spectively causing light-green mosaic 

 and severe yellow mosaic of wheat in 

 Kansas; wheat streak-mosaic virus, Mar- 

 mor virgatum McKinney (ibid., 34, 1944, 

 324) with varieties typicuni McKinney 

 and viride McKinney (ibid., 34, 1944, 

 325), respectively causing yellow streak- 

 mosaic and green streak-mosaic of wheat 

 in Kansas; Agropyron-mosaic virus, 

 Marmor agropyri McKinney (ibid., 34, 



1944, 326), with varieties typicum 

 McKinney and flavum McKinney, re- 

 spectively causing green-mosaic mottling 

 and yellow-mosaic mottling in the grass 

 Agropyrou repens (L.) Beauv. in Vir- 

 ginia; also a virus, Flavimacula ipomeae 

 Doolittle and Harter (Phytopath., 35, 



1945, 703), causing feathery mottle of 

 sweet potato in Maryland [see Marmor 

 persicae for treatment of a virus that 

 was assigned as type of Flavimacula 

 McKinney (Jour. Washington Acad. Sci., 

 34, 1944, 149), a genus originally differ- 

 entiated from Marmor as containing 

 viruses not yet inoculable save by tissue 

 union ; a natural group of viruses may be 

 represented but their characteristics and 

 affiliations seem not yet clear]. 



Genus II. Acrogenus Holmes, 

 {hoc. cit., 110.) 



Viruses of the Spindle-Tuber Group, inducing diseases characterized by abnormal 

 growth habit of host plants without chlorotic or necrotic spotting, systemic chlorosis, 

 witches'-broom formation, or production of galls. Generic name from Greek, meaning 

 point- or peak-producing, in reference to shape of potatoes affected by potato spindle- 

 tuber virus. 



The type species is Acrogenus solani Holmes. 



