PLANT DISEASES DUE TO FUNGI. 



THE WILT DISEASE OF TOMATOES AND CUCUMBERS, 



Mycosphaerella citmllina, 

 Grossenb. 



Not for many years past 

 have tomato and cucumber 

 plants suffered from disease 

 to such an extent as in the 

 season 1910, and, unfortu- 

 nately, to the many fungi 

 attacking these plants we have 

 to record the further spread 

 of the Wilt or Canker disease, 

 due to a fungus known as 

 Mycosphaerella citmllina . 



The disease was first 

 described by Dr. Grossen- 

 bacher 1 in 1909, as attacking 

 muskmelons under glass in 

 the State of New York. He 

 mentions that the vines had 

 practically reached their full 

 growth before the trouble 

 appeared, indeed some of the 

 first fruits were nearly ripe. 

 The disease was preceded by 

 a rather severe attack of the 

 mite Tetranychns telarins, com- 

 monly termed red " spider." 



Leaflet No. 230 of the 

 Board of Agriculture and Fish- 

 eries, dated February, 1910, 

 records that specimens of 

 diseased tomato plants were 

 received from Waltham Cross 

 at Kew in 1909, suffering from 

 this disease, and from Glouces- 

 tershire a cucumber plant. FIG. 21. TOMATO AND CUCUMBER WILT. 



1 N.Y. Agric. Exp. Stat., Tech. Bull. No. 9, 1909. 



