13 



Mr. Vanderleck spoke on " The Causes of Gum Excrescence in Fruit 

 Trees," and Prof. Blair on "The Capacity of Certain Varieties of Potatoes 

 to Resist Blight." 



The afternoon meeting adjourned at 5.45, to meet again at 7.30, when 

 illustrated lectures were given. 



Prof. Lochhead presided at the evening meeting, at which a paper ou 

 the " Fleshy Fungi of 1909" was given by the Rev. Dr. Robert Campbell, 

 of Montreal, who presented some fine specimens to the College Museum. 



Dr. Harrison gave an illustrated address on " Bacteria and Their 

 Relation to Plant Diseases." It is unfortunate that Dr. Harrison was 

 unable to prepare a written account of his lecture, and owing to the lecture 

 being illustrated with lantern slides it was impossible to take anything like 

 copious notes. However, mention must be made of a bacterial disease of 

 beans, or "* Bacteriosis of Beans," which the speaker proved to be causing 

 loss and injury in the bean-growing sections of the province. 



The disease usually begins at the margin of the leaf, or where the leaf 

 has been injured or torn by insects, wind or hail. Here a yellow spot 

 appears, and the green of the leaf is destroyed. The spot increases rather 

 slowly and the diseased tissues become brown, eventually breaking away or 

 remaining withered on the stem. The disease enters the stem by the leaf 

 stalk and advances in the stem to other leaves and to the young pods. In 

 some eases the pod may wilt and die and on opening it the half grown seeds 

 are found shrivelled and discoloured. The disease is caused by Pseu- 

 domonas phaseoli, (Erwin & Smith). 



The methods of eradication suggested were: — 



1. Infested seed should not be planted. 



2. Fields where the disease has occurred are unfit for profitable bean 

 growing for at least one season, the germ living over in stems and leaves 

 left on the ground. 



3. Infested bean straw should be burned. If fed to animals or used 

 for bedding the germs are apt to be spread to uninfested parts. 



In addition to the Bean Bacteriosis, mention was made of the " Soft 

 Rot of White Turnips, Cauliflowers and Cabbages," and the " Bacterial 

 Rot of Celery. " 



Before the meeting concluded Prof. Lochhead gave a paper on the 

 " Crown Gall of the Apple and Peach," which is given verbatim in this 

 report. 



After a hearty vote of thanks had been given to the speakers for their 

 interesting and valuable addresses the meeting adjourned. 



