Notes and Brief Articles 



59 



cases, cut out the diseased tissue, disinfect the wound with lysoi 

 and leave it exposed to the air. Bridge grafting has been tried 

 on valuable trees, but can not be recommended as a general prac- 

 tice, since trees so treated are rarely thrifty. 



In Bulletin 222 of the Connecticut Agricultural Experiment 

 Station, Dr. Clinton gives an account, with illustrations, of new 

 and unusual plant injuries and diseases found in Connecticut, 

 1916-1919. Under Dry Rot, on page 398, he describes a house 

 at Westbrook, which was attacked by Merulius lacrymans and 

 seriously damaged because of insufficient air drainage about the 

 woodwork. Among the remedial measures suggested were : The 

 removal and burning of all infected wood and rubbish ; the 

 creosoting, if possible, of the new wood used; and the building 

 of several sunken areaways, protected only by wire netting, to 

 allow free access of air under the house. According to Dr. 

 Clinton, the dry-rot fungus depends in great measure for its 

 development upon a fairly small and tightly closed air space next 

 the wood, and a sufficient amount of water to keep the air therein 

 constantly saturated or at least above the normal amount. 



The results of experimental work and observations on the 

 citrus canker by Peltier and Frederich are published in the 

 Journal of Agricultural Research for July 15, 1920. The fol- 

 lowing statements are quoted from the summary : 



The successful inoculation of a large number of wild relatives 

 in the greenhouse shows that Pseudomonas citri has a wide 

 range of hosts and is not limited to the genus Citrus. 



So far as the menace of citrus-canker to the citrus industry of 

 the United States is concerned, with the exception of Poncirus 

 trifoliatd, none of the wild relatives, native or introduced, now 

 growing in the citrus districts are susceptible enough to have any 

 bearing on the eradication program. 



Leaf texture is apparently an important factor in influencing 

 resistance to Pseudomonas citri by its host plants. This phase 

 deserves further investigation. 



