New York Agricultural Experiment Station. 531 



with Bordeaux mixture unless spraying is continued after the fruit 

 begins to ripen. It is interesting to note that sprayed plants seemed 

 to be very distasteful to the hordes of Colorado potato beetles which 

 attacked tomatoes late in the season. The same thing was observed 

 where potato plants were sprayed with Bordeaux mixture. 

 Bordeaux is of more value as a check to insects than is generally 

 supposed. 



Between the iirst appearance of blossoms and the ripening of the 

 first fruits, tomato plants grow very rapidly. Therefore, it is 

 necessary during this period to spray oftener than is reconmiended 

 for most plants. They should be sprayed at least once in ten days 

 in order to keep the foliage well protected. 



There is is no danger whatever in eating tomatoes which have 

 been sprayed with Bordeaux mixture, but consumers prefer to buy 

 clean fruit and run no risk. Hence, tomatoes grown for the market 

 should not be sprayed with Bordeaux mixture after they begin to 

 ripen. Of course, if necessary, the spots can be removed with a 

 cloth moistened with water containing a small amount of vinegar or 

 acetic acid. Should it become necessary to spray for tlie Cylin- 

 di^osporiiim disease while the fruit is ripening some fungicide which 

 does not spot the fruit must be used. Perhaps ammoniacal copper 

 carbonate solution can be used. 



To state the whole matter briefly : 



1. "Black rot" of tomatoes is caused chiefly by the fungus, 

 Macrospori um Tomato . 



2. It can probably be controlled with Bordeaux mixture. 



3. Beginning when the blossoms appear spray at intervals of ten 

 days until the fruit begins to ripen. 



4. " Black rot " is most severe in dry weather. 



5. A new disease caused by Cylindrosporiuni sp. has been 

 destructive to tomato foliage the past season. 



6. If necessary to spray for Cylimlrosporium after the fruit is 

 ripe, try ammoniacal copper carbonate solution. 



7. Bordeaux mixture is very distasteful to Colorado potato beetles. 



IV. A DISEASE OF NOEWAY MAPLES. 



In July of the past season my attention was called to a disease 

 which was injuring Norway maples {Acer i^latanoides^ L.) at the 

 nurseiy of Isaac Ilicks and Son, Westbury, N. Y, In a lot of 



