THE HORTICULTURAL SOCIETY OF NEW YORK 



Death from what is here called dry rot differs in that the 

 dying scales are dry and rather brittle from the beginning of 

 infection. In the latter stages various saprophytic fungi are 

 present in abundance and somewhat complicate the determination 

 of the organisms that may be the primary cause of death. Fur- 

 ther studies may show that both the soft and the dry rots may 

 be initiated by the same organism, and that differences in the 

 general appearance may arise in connection with different degrees 

 of association with saprophytic fungi. However, the presence of 

 the Botrytis fungus in spring suggests that its activity in stored 

 bulbs may be concerned in the development of dry rot. 



In the earlier stages of infection both in dry and in soft rot, 

 the flower appears to be normally developed and there is in many 

 cases no sign of blindness. Furthermore, in large numbers of 

 bulbs in which blindness is in evidence at this time there is no 

 indication of the beginning of any rot in the scales. Blindness 

 such as discussed above does not seem to be directly associated 

 with fungous or bacterial infection. 



The development of rots during the summer of 1917 among 

 stored bulbs at the New York Botanical Garden was almost ex- 

 clusively confined to tulip Margaret. When rots develop thus 

 among stored bulbs, it is certainly necessary to sort rigidly when 

 bulbs are planted, and it would also be advisable not to plant 

 such stock in special display beds. A. B. Stout. 



New York Botanical Garden. 



Explanation of Plates 



Plate 40 



Plants of tulips : No. i White Jewel, No. 2 Cramoise Brilliant, at end 



of blooming period in the spring of 1917. Abnormal development of 



leaves seen in the first bulb of No. i, and from all the new bulbs of No. 2. 



No. I also blind. 



Plate 41 



No. 3. Entire plant of tulip La Triumphante, showing leafy develop- 

 ment from the first bulb. 



Nos. 4-8. Sister bulbs of a plant like No. 3, arranged in order. Ab- 

 normal growth marked in No. 4, and also seen in Nos. 6 and 7. 



No. 9. Abnormally elongated and enlarged basal portion of stem ; and 

 No. ID, the three bulbs prematurely developed from its lateral buds, all 

 showing the development within such a bulb as No. 4. 



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