29 



SUMMARY. 



(1) For leaf rot {Pellicularia holeroga) there has been found no 

 really satisfactory method of control. The benefit of repeated spray- 

 ings with Bordeaux mixture is lessened by the fact that the fungus 

 is not all killed even by repeated sprayings, enough remaining to 

 reinfect the trees after a time. 



(2) For leaf spot {Stilhella jiavida) Bordeaux mixture is really 

 effective, and it may be recommended to prevent the disease from 

 extending to healthy and productive plantings. 



(3) Cercospora spot of the berries, which causes the more badly 

 affected berries to be pulped with difficulty, and also injures the 

 grain to some extent, is to be prevented in its worst form by provid- 

 ing sufficient shade, which by rendering less harmful this and other 

 sources of injury to the grain decidedly improves the quality of the 

 output. 



(4) The root disease may be prevented from spreading by ditch- 

 ing, this being preceded by the removal and destruction of vegetable 

 debris, diseased trees, and stumps. It is apparent that the addition 

 of unslaked lime, sulphur, and some other substances to the soil 

 prevents the growth of the fimgus causing the disease. 



(5) Importance is to be placed on the use of preventive measures 

 to keep the stiU healthy younger plantings in good condition rather 

 than on attempts to exterminate the diseases among the older trees. 



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