1222 



MANUAL OF DETERMINATIVE BACTERIOLOGY 



Transmission : By inoculation of ex- 

 pressed juice. By the tarnished plant 

 bug, Lygus pratensislAnn.{MIRIDAE). 

 The insect vector retains this virus dur- 

 ing intervals between crops. 



Literature : Kaufmann, Arb. Biol. 

 Reichsanst. Land- u. Forstw., 21, 1936, 

 605-623; Mitteil. Landwirtsch., 37, 1936; 

 Pape, Deutsch. Landwirtsch. Presse, 

 26, 1935. 



