FAMILY MARMOEACEAE 



1197 



Geographical distribution : United 

 States (Washington). 



Induced disease : In sweet cherry, 

 chlorotic mottling 4 to 5 weeks after full 

 bloom, first on small basal leaves, later on 

 all leaves. The older affected leaves de- 

 velop autumnal colors and absciss, 30 to 

 70 per cent of the foliage being lost. 

 The remaining foliage appears somewhat 

 wilted, shows increased mottling, chlo- 

 rotic spots, and ai'eas becoming yellowisli 

 brown, appearing rusty. Blossoms nor- 

 mal. Fruits smaller than normal, in- 

 sipid, not misshapen. Growth rate of 

 tree reduced slightly. 



Transmission: By grafting. Not by 

 inoculation of e.xpressed juice. No insect 

 vector is known. 



Literature : Reeves, Phytopath., 30, 



1940, 789 (Abst.); Jour. Agr. Res., 62, 



1941, 555-572 (see 566-567). 



54. Marmor cerasi Zeller and Evans. 

 (Phytopath., 31, 1941, 467.) From Latin 

 cerasus, cherry tree ; originally spelled 

 cerasae, by error. 



Common name : Cherry mottle-leaf 

 virus. 



Hosts : ROSACEAE — Primus avium 

 L., sweet cherry; P. emarginata (Dougl.) 

 Walp., wild cherry. Experimentally, 

 also P. cerasus L. (tolerant) and P. ma- 

 haleb L. (tolerant). 



Geographical distribution : United 

 States (Washington, Oregon, Idaho, Cali- 

 fornia) and Canada (British Columbia). 



Induced disease : In sweet cherry, chlo- 

 rotic mottling ; leaves puckered, wrinkled, 

 distorted, not perforated. Blossoms not 

 affected. Fruit small, hard, insipid, un- 

 even or delayed in ripening. Crop re- 

 duced. Branches shortened, tree even- 

 tually stunted. 



Transmission : By budding. No insect 

 vector is known. Not by the black 

 cherry aphid, Mysws cerasi (F.) (APHI- 

 DIDAE). Not by inoculation of ex- 

 pressed juice. 



Thermal inactivation : Not demon- 

 strated ; not at 46° C in 60 minutes nor at 

 49° C in 10 minutes in bud sticks. 



Literature : Reeves, Washington State 

 Hort. Assoc. Proc, 31, 1935, 85-89; Jour. 

 Agr. Res., 62, 1941, 555-572; Zeller, Ore- 

 gon State Hort. Soc. Report, 26, 1934, 

 92-95; Phytopath., 31, 1941, 463-467. 



55. Marmor lineopictum Cation 

 (Phytopath., 81, 1941, 1009.) From 

 Latin linea, line, and pictus, ornamented. 



Common names : Prunus line-pattern 

 virus, peach line-pattern virus. 



Hosts : ROSACEAE — Prunus salicina 

 Lindl., Japanese plum; P. mahaleb L., 

 Mahaleb chei'ry; P. persica (L.) Batsch, 

 peach (= Amy gdalus persica \j.). 



Geographical distribution : United 

 States (Kentucky, Michigan, California, 

 Ohio; perhaps widely distributed). 



Induced disease : In peach and Ma- 

 haleb cherry, light-colored line patterns 

 or faint chlorotic mottling, tending to 

 become masked as leaf becomes old. In 

 peach, affected foliage sometimes less 

 glossy than normal. In Prunus salicina, 

 no disease manifestations usually ; rarely, 

 chlorotic mottling on a few leaves. 



Transmission : By grafting. No insect 

 vector is known. 



Literature : Berkeley, Div. of Bot. and 

 Plant Path., Science Service, Dominion 

 Dept. Agr., Ottawa, Canada, Publ. 679, 

 1941; Cation, Phytopath., 31, 1941, 1004- 

 1010; Thomas and Rawlins, Hilgardia, 

 12, 1939, 623-644 ; Valleau, Kentucky Agr. 

 Exp. Sta., Res. Bull. 327, 1932, 89-103. 



56. Marmor pallidolimbatus Zeller and 

 Milbrath. (In Handbook of Virus Dis- 

 eases of Stone Fruits in North America, 

 Michigan Agr. Exp. Sta., Miscell. Publ., 

 May, 1942, 50; Phytopath., 32, 1942, 

 635.) From Latin pallidus, pale, and 

 limbatus, bordered. 



Common name : Cherr}^ banded-chloro- 

 sis virus. 



Hosts: ROSACEAE — Prunus serru- 

 lata Lindl., flowering cherrj^; P. avium 

 L., Mazzard cherry. 



Geographical distribution : United 

 States (Pacific Northwest). 



Induced disease : In flowering cherry. 



