1194 



MANUAL OF DETERMINATIVE BACTERIOLOGY 



Hosts: ROS ACE AE— Rosa hybrids, 

 roses. 



Geographical distribution : Australia, 

 especially Victoria; New Zealand; possi- 

 bly Italy. 



Induced disease : In rose, leaflets crowd 

 ed, brittle, recurved. Defoliation pro- 

 gresses from tip to base of plant. Tips of 

 branches discolor and die back an inch or 

 two. Stem darkens at base. Buds re- 

 main green and begin development, 

 but growth is soon checked by necrosis at 

 tips. Plant may recover temporarily, 

 but not permanently. 



Transmission : By inoculation of ex- 

 pressed juice (needle-puncture and 

 scratch methods). No insect vector is 

 known. 



Filterability : Passes Seitz filter (Seitz 

 EK Schichten type, size 6). 



Literature: Gigante, Boll. Staz. Pat. 

 Veg. Roma, n. s. 16, 1936, 76-94; Grieve, 

 Austral. Jour. Exp. Biol, and Med. 

 Science, 8, 1931, 107-121; Jour. Dept. 

 Agr. Victoria, 1932 and 1933, pages 30-32. 



45. Marmor rosae H. {loc. cit., 74). 

 From Latin rosa, rose. 



Common name: Rose -mosaic virus. 



Hosts : ROSACE AE— Rosa rugosa 

 Thunb. ; R. chinensis Jacq. var. manetti 

 Dipp.; R. vxidtiflora Thunb.; R. odorata 

 Sweet, tea rose; R. gymnocarpa; Rnbiis 

 parviflorus Nutt. 



Geographical distribution : United 

 States, England, Bulgaria, Brazil. 



Induced disease : In Rosa rugosa and R,. 

 chinensis var. manetti, systemic chlorotie 

 mottling. 



Transmission : By budding and other 

 forms of graftage. Not by inoculation of 

 expressed juice. No insect vector is 

 known. 



Literature : Baker and Tiiomas, Phyto- 

 path., 32, 1942, 321-326; Brierley, Phyto- 

 path., 25, 1935, 8 (Abst.); Brierley and 

 Smith, Am. Nurseryman, 72, 1940, 5-8; 

 Jour. Agr. Res. , 61 , 1940, 625-660 ; Kramer, 

 Revista de Agricultura, 15, 1940, 301-311 ; 

 O Biologico, 6, 1940, 365-368; McWhorter, 

 U. S. Dept. Agr., Plant Dis. Rep., 15, 



1931, 1-3; Milbrath, West. Florist, 13, 

 1930, 29-30; Nelson, Phytopath., 20, 1930, 

 130 (Abst.) ; Newton, Rep. Domin. Bot., 

 1930, Div. Bot., Canad. Dept. Agr., 1931, 

 23; Thomas and Massey, Hilgardia, 12, 

 1939, 645-663; Vibert, Jour. Soc. Imp. et 

 Cent. Hort., 9, 1863, 144-145; White, 

 Phytopath., 22, 1932, 53-69; 24, 1934, 

 1124-1125. 



46. Marmor veneniferum H. (loc. cit., 

 75). From Latin venenifcr, poisonous, in 

 reference to occasional killing of tissues 

 near inserted bud in graft transmission. 



Common name: Rose-streak virus. 



Hosts: ROSACEAE—Rosa multi flora 

 Thunb.; R. odorata Sweet; 72osa hybrids. 



Geographical distribution: Eastern 

 United States. 



Induced disease : In various rose species 

 and hybrids, brownish or reddish ring and 

 veinbanding patterns on leaves, and ring 

 patterns on stems. Sometimes necrotic 

 areas near inserted bud, causing girdling 

 of stem and wilting of foliage. 



Transmission : By grafting. Not by 

 inoculation of expressed juice. No insect 

 vector is known. 



Literature: Brierley, Phytopath., 25, 

 1935, 7-8 (Abst.); Brierley and Smith, 

 Jour. Agr. Res., 61, 1940, 625-660. 



47. Marmor mail H. (loc. cit., 75). 

 From Latin mains, apple tree. 



Common name : Apple-mosaic virus. 



Hosts: ROSACEAE—Pyrus jnalus L., 

 apple. Experimentally, also Cotoneaster 

 harroviana; Eriohotrya japonica Lindl., 

 loquat ; Photinia arbutifolia Lindl., 

 toyon; Rosa sp., rose; Sorbus pallescens. 



Insusceptible species: ROSACEAE — 

 Amelanchier alnifolia Nutt.; Crataegus 

 douglasii Lindl.; Pyrus communis L., 

 pear. 



Geographical distribution : United 

 States, Australia, Bulgaria, British Isles. 



Induced disease : In apple, clearing of 

 veins and systemic chlorotie spotting. 

 The chlorotie areas sometimes become 

 necrotic during months of intense sun- 

 light. 



Transmission : By grafting. No insect 



