552 



BACTERIAL DISEASES OF PLANTS 



B 



iFg. 415.— a. PolythaJamous very leafy gall on sweetbriar (Rosa ruhiginosa) 

 due to Rhochtes rosae L. B. Vertical section passing through some of the larval 

 chambers. The felted mass consists of finely disscfted green leaves of a type 

 totally unlike the normal leaves of the plant. 



