FAMILY CHLOROGENACEAE 



1151 



States (southern Pennsylvania to north- 

 eastern Georgia, west to southwestern 

 Ohio and Tennessee). 



Induced disease : In black locust, clear- 

 ing of veins, followed by progressive re- 

 duction in size of newly formed leaves; 

 growth of spindly shoots to form witches' 

 brooms. Roots more brittle, shorter, and 

 darker than normal, with excessive 

 branching of rootlets, giving the appear- 

 ance of root brooms. 



Transmission : By grafting and bud- 

 ding. Not by inoculation of expressed 

 juice. No insect vector is known. 



Literature :Grant etal., Jour. Forestry, 

 40, 1942, 253-260; Hartley and Haasis, 

 Phytopath., 19, 1929, 163-166; Jackson 

 and Hartley, Phytopath., 23,193S, 83-9 0; 

 Waters, Plant World, 1, 1898, 83-84. 



8. Chlorogenus medicaginis H. {loc. 

 cil., 14). From New Latin Medicago, 

 generic designation of alfalfa (lucerne). 



Common names : Alfalfa witches'- 

 broom virus, lucerne witches'-broom 

 virus, spindle-shoot virus, mistletoe 

 virus, Kurrajong virus, bunchy-top virus. 



Hosts : LEG UM I NOS A E— Medicago 

 sa(it;a L., alfalfa (lucerne). 



Geographical distribution : Australia, 

 especially New South Wales; perhaps 

 United States. 



Induced disease : In alfalfa, plant 

 dwarfed; leaves small, rounded, chlorotic 

 at edge, puckered, distorted ; stems short, 

 spindly, numerous. Flowers usually not 

 formed, but sometimes pale and small, 



sometimes replaced by leafy structures. 

 Seed rarely produced. 



Transmission: By grafting. Not by 

 inoculationof expressed juice. No insect 

 vector is known. 



Literature : Edwards, Jour. Australian 

 Inst. Agr. Sci.,1, 1935, 31-32; New South 

 Wales Dept. Agr., Science Bull. 52, 1936; 

 Agr. Gaz. New South Wales, 47, 1936, 

 424-426; Richards, U. S. Dept. Agr., 

 Plant Disease Reporter, Supplement, 71, 

 1929, 309-310. 



9. Chlorogenus humuli H. {loc. cit., 

 15). From New Latin Humulus, generic 

 designation of the hop. 



Common names : Hop-nettlehead virus, 

 silly-hill disease virus, virus of infectious- 

 sterility of the hop. 



Hosts : MO RACE AE— Humulus lupu- 

 lus L., European hop. 



Geographical distribution : England, 

 Czechoslovakia, Germany, Poland. 



Induced disease : In hop, stems numer- 

 ous, spindly, short, plants weak. Leaves 

 curled upward at margin; cone produc- 

 tion greatly reduced. 



Transmission: By grafting. Not by in- 

 oculation of expressed juice. Not 

 through soil. No insect vector is known. 



Literature : Blattny and Vukolov, Rec. 

 Inst. Rech. Agron. Rep. Tchecosl., 137, 

 1935, 3-18; Goodwin and Salmon, Jour. 

 Inst. Brew., 33, 1936, 209-210; Salmon, 

 ibid., 32, 1935, 235-237; 33, 1936, 184-186; 

 Salmon and Ware, Jour. South-Eastern 

 Agr. College, Wye, Kent. 37, 1936, 21-25. 



Genus II. Carpophthora Mc Kinney emend. 

 (Jour. Washington Acad. Sci., 34, 1944, 152.) 



Peach X-Disease Group; viruses inducing diseases characterized in general by 

 rosetting of foliage and sometimes death of host. Generic name from Greek, meaning 

 fruit and ruin or destruction. 



The type species is Carpophthora lacerans McKinney. 



Key to the species of genus Carpophthora. 

 I. Inducing chlorosis, reddening, and tattering of foliage, with rosette formation 



late in the disease in some hosts. 



1. Carpophthora lacerans. 



