INSECT AND FUNGOUS PESTS 43 



Fiisarium hasinfectum. It has been known in Hol- 

 land for a number of years. Infected plants turn 

 yellow and soon die. Investigation shows that the 

 roots are the seat of the fungous attack. His investi- 

 gation leads him to believe that the fungus is close- 

 ly related to that which causes wilt of melons, cot- 

 ton, cowpeas, etc. Masserson^^ gives an account of 

 Sclerotinm disease of peas and beans which is due to 

 the fungus Chlcrotinia libcrtaua. The disease was 

 especially destructive in certain regions of France 

 in the spring of 1907. Its usual development is said 

 to be due to intensive culture of peas, the crop being 

 frequently grown successively on the same soil. 

 Then, too. the favorable conditions of humidity and 

 temperature are a consideration. Rotation of crops 

 is recommended as a preventive. In addition the 

 debris of all diseased plants should be collected and 

 burned. 



" E. S. R., Vol. 19. 



