Symptoms 



Radish. 



Subject to same fungus attacks as Cabbage 

 (p. 71). 

 Raspberry. 



Stem. — Pallid patches on bark bearing min- 

 ute black fungus fruits, due to Aacochyta sp., 

 etc. Remove diseased canes. Spray iq August 

 with Bordeaux mixtiu?e. 



Foliage. — Small yellow spots thickly 

 sprinkled over lower surface, followed by 

 tufts of dark spores, due to the rust fungus 

 Phragmidium Rubi-Idaei. More common on 

 wild than on cultivated plants. Cut out old 

 canes as soon as they have fruited, and keep 

 stools free of dead leaves and rubbish. 

 Rhododendron. 



Foliage. — Swellings the size of a pea to that 

 of a marble, at first yellowish-green, later rosy 

 with a whitish bloom. Due to Exohasidium 

 Bhododendri, and occurring on Rhododendron 

 ferrugineum, R. hirsutum, and R. Wilsoni. 

 Pick o£E and burn the galls. 

 Rose. 



Root. — Large globular swelling due to the 

 Crown-gall organism Bacterium tumefaciens. 

 Cut away and bum. 



Stem. — Cracks in bark through which corru- 

 gated tissue-growths protrude, on which small 

 black fungus fruits develop. The spots at first 

 96 



