78 



with a mixture of sulphur and lime (the lime being in excess of 

 the sulphur). 



This mixture can easily be made and can readily be applied. 

 The slowly-evolved gases, are readily soluble in water, forming a 

 solution which should be strong enough to kill the spores and 

 germinal tubes, but too weak to injure the leaves of the plant. I 

 have been unable to obtain any information respecting any ex- 

 periments that have been carried on either in America or the 

 West Indies with a view to obtaining a treatment for the pre- 

 vention of anthracnose of cotton, and therefore this makes it all 

 the more important that experiments should be started even on a 

 small scale, to obtain such information. 



Another point in the treatment of this disease is very important 

 — this is the sterilization of cotton seed before planting. Spores 

 are held attached to the seed coat and these possibly produce the 

 disease in the cotyledons of seedlings. Further information on 

 the sterilization of cotton seed will be forthcoming before next 

 planting season as experiments are now in hand dealing with this 

 subject. 



F. A. STOCKDALE, Mycologist. 



LOGWOOD : DISEASE AND CULTIVATION. 



In the fall of the year 1902 the Director of Public Gardens went 

 on special leave to the ;States. He was fortunate enough to in- 

 terest Dr. Britton, Director of the New York Botanical Garden, in 

 Jamaica, and on his return Dr. Britton allowed Prof. Earle to ac- 

 company him to study generally the plant diseases of the Island. 

 Prof. Earle made a report which was published in the Jamaica 

 Bulletin for February, 1903. , One of the diseases investigated was 

 the Logwood Root Rot, and the following is Prof. Earle's state- 

 ment about it. Recently letters have appeared in the " Gleaner" 

 from Dr. Bucher and Mr. J. W. Edwards on the subject, and it has 

 been thought well to call the attention of planters again to the 

 subject. 



I. By Prof. Earle. 



On some estates, especially toward the western end of the island, 

 logwood trees are dying in considerable numbers. 



The diseased trees usually occur in groups, the infection spread- 

 ing slowly but in constantly widening circle. An examination of 

 dying trees shows the roots to be badly rotted. Their surface tis- 

 sues are invaded by a white fungus mycelium that is usually more 

 abundantly developed in the region between the bark and the 

 wood. The disease seems to attack first the small rootlets, grad- 

 ually spreading to the larger roots and the crown when the tree 

 dies. In many cases seeming heahhy trees near the border 

 of infested areas were found to have the roots on the side next the 

 dying trees badly diseased, while on the other side they were 

 still perfectly healthy. The fungus seems to be the mycelium of 

 some of the Hymenomycetes. Numerous species of Polyporaceae 



