Gi Hepokt of the Botanist of the 



to the production of sporos; but it is difficult to harmonize this 

 idea with the statements of florists who say that the disease may 

 be very destructive in dry seasons. During the extremely dry 

 summer of 1899, a correspondent in Ma.ssachusetts lost, through 

 this anthracnose, all field grown plants propagated from cuttings. 

 It also did considerable damage to plants grown from seed. 



The basidia are very short, being scarcely distinguishable 

 except in very thin sections. 



ON THE LEAVES. 



Plants attacked by anthracnose show multitudes of dead 

 leaves which remain hanging on the stems a long time. 



The leaf spots are circular^ slightly sunken and have a diameter 

 of from three to five millimeters. They originate as yellowish- 

 green spots with indefinite outline, but very soon become dirty 

 white, or sometimes greenish, definitely outlined and very fre- 

 quently have a narrow brown border. If the plants have good 

 ventilation and are kept moderately dry neither spores nor setre 

 are formed and the spots retain their dirty white color; but in a 

 moist chamber both spores and 6eta3 make their appearance in 

 from 24 to 48 hours. Upon the appearance of spores and setaj, 

 the leaf spots instead of turning black (as is the case with the 

 stem spots) merely become smoke colored. This is owing to the 

 fact that the stromata of the acervuli are much lighter in color 

 and the setae much less numerous than on the stem spots. The 

 stromata are also less developed than those on the stems. 



AN EXPERIMENT ON TREATMENT. 



From the nature of the disease it was expected that it could 

 be prevented by spraying. Accordingly, the following experi- 

 ment was made: On May 15, 1897, 110 Antirrhinum plants, six 

 to eight inches high and apparently healthy were set in two rows 

 of 55 plants each. On row was sprayed once a week with Bor- 

 deaux mixture, receiving in the course of the summer 17 appli- 

 cations, while the other row was left unsprayed for a check. 



