3i6 Bulletin 146. 



strated that weak Bordeaux mixture could be used until within about 

 five weeks of bleaching, and that as a fungicide for celery bHght the 

 Bordeaux is superior to the ammoniacal copper carbonate. It is well, 

 however, to use the latter fungicide if spraying must be done within a 

 month of bleaching. 



The *' damping off " fungi of lettuce and other plants grown under 

 glass have been studied with special reference to the conditions 

 favoring the disease. An attempt is being made to follow out the 

 life histories of the fungi concerned. This work is still in progress. 



A rot of greenhouse tomatoes has received considerable attention, 

 and while no fungus has been found associated with it, experiments 

 are being made to ascertain, if possible, the conditions which may 

 induce it. . 



Investigations upon a mold growth occurring upon the parchment 

 paper hning and upon the wood of butter tubs have determined the 

 conditions of growth of the fungus. Care in the selection of tubs 

 made from well-seasoned heart wood, the storing of tubs in a dry place, 

 and the use of the best parchment paper will probably reduce the 

 liability of mold. However, experiments indicate that the use of one 

 per cent, formalin solution, or a very weak solution of copper sulphate 

 upon the parchment paper will prevent the growth of mold. 



An effort is being made to look more carefully into some of our 

 bacterial diseases of plants, and to study those which may be due to 

 such organisms. 



