— 62 — 



hypocotyl part of the root is less resistant against the disease than the true or 

 primar}^ part of the root. Thus the lower part (the true or primary root) of a 

 long-shaped turnip which has been attacked by the soft rot is still sound in many 

 cases, but a globe-shaped turnip (mainly consisting of hypocotyl) is generally 

 entirely destroyed. 



The outside bast layer of the turnip withstands the attack fairly well, and 

 instances were found when an outwardly sound root was absolutely hollow in- 

 side of a thin layer of skin and bast. Another feature worth mentioning is that 

 the crown very often keeps green even after the greater part of the inside root 

 has been destroved. 



3. — Turnip Rot bacillus from culture on 

 beef peptone agar, 15 hours at 30" C x 1000. 



The infection seems to spread from the pith of the root and often starts from 

 the middle of the hypocotyl. How the organisms gain entrance to these deep 

 tissues has not been demonstrated experimentally. 



4. — Same preparation as Fig. 2 x 2000. 



Whilst the rot appears in dry as well as wet years, the seasons 1910 and 

 1912, which may be described as zi'et years were characterised by much soft rot. 

 On a rough estimate, 40 per cent, of the turnips in 1910 were diseased. The 

 conditions of the trial plots on the College farm were similar to those found on 

 farms throughout the country, and we have received many reports of the pre- 

 valence and destructiveness of this rot from Quebec and Ontario. 



