FUNGI IMPERFECTI 



293 



Control. Abundant experimental work has shown that of the 

 two possible lines of control, soil treatment or seed treatment, the 

 latter is most effective ; and this, together with a judicious rota- 

 tion of crops, is sufficient permanently to control this disease. 

 The method of treating the seed tubers consists in immersing 

 them for two or more hours in a solution of 1 ounce of formalin 

 to every 2 gallons of water, or in a solution of bichloride of mer- 

 cury, consisting of 1 ounce to 8 gallons of water. 



V. BUD ROT OF CARNATIONS 



# 



Sporotrichum Poce Pk. 



Heald, F. D. The Bud Rot of Carnations. Neb. Agl. Exp. Sta. Built. 103 : 



pis. 1-8. 1908. 

 Stewart, F. C, and Hodgkiss, H. E. The Bud Rot of Carnations and the 



Silver Top of June Grass. N. Y. (Geneva) Agl. Exp. Sta., Tech. Built. 



7: 83-119. pis. 1-6. 1908. 



Habitat relations. The bud rot of carnations has recently 

 received careful attention as of importance in some of the green- 

 houses of New York, Illinois, and Nebraska. In cases where the 

 infection is late in developing, or where the conditions are un- 

 favorable for the fungus, the infected flowers may be only slightly 

 abnormal or disfigured. Even in these cases, however, the petals 

 become eventually discolored, and the death of the calyx also en- 

 sues. In severe attacks, or under favorable conditions for the 

 fungus, there is developed within the bud a soft rot, resulting 

 in discoloration of all the parts. Occasionally the evidences of 

 fungous growth are sensible to the unaided eye. 



Commonly there is associated with the fungus a species of 

 mite. According to the experimental evidence, this mite has no 

 causal connection with the disease, but it is doubtless of im- 

 portance in the distribution of the fungus. In an early stage 

 of the attack, the mites are extremely minute, and might be over- 

 looked ; but later the distention of the mite body makes it an 

 object of such size that it may not be overlooked even upon 

 casual observation. Experiments have clearly indicated that the 

 fungus is able to produce the disease when inoculated in the 

 young buds by needle prick or scalpel wound. 



