!N^£\v YoEK Agkicultukal ExPEKiMEisTT Station. 165 



very light (.Y5 incli at Cutchogue) there was considerable fog. 

 Mr. Sirrine states that there was continuous fog from August 18 

 to 20, inclusive, and some each day for a week following this 

 period, but no rain fell between August 13 and 31. It is our 

 opinion that the injury was caused by the hot sun falling upon 

 young leaves which were unusually tender because of having grown 

 in foggy weather. 



Tip burn should not be confused with the bacterial disease 

 called black rot''^ of cauliflower, cabbage and related plants. 

 Both diseases may occur in the same plant, but many plants 

 affected with tip burn show no blackening of the fibro-vascular 

 bundles — the most reliable diagnostic character of the black rot. 

 Tip burn affects the margins of the young leaves, while black rot 

 attacks chiefly the old leaves and when it does occur on young 

 leaves shows itself throughout the whole leaf rather than at the 

 margin. 



The amoimt of damage done by tip bum of cauliflower has 

 been small. 



LEAF SCORCH OF ^^ORWAY AND SUGAR MAPLES. 



The ISTorway maple, Acer platanoides, is much subject to injury 

 from excessive transpiration. In !N^ew York more or less of it occurs 

 nearly every season. It is most common on recently transplanted 

 trees, but very frequently occurs on rapidly growing nursery stock 

 and in very dry seasons may be observed also upon large shade 

 trees. During the past season this maple leaf scorch has been 

 been unusually common. Besides attacking the ISTorway maple it 

 has been common on the sugar maple, Acer saccTiarinum. In the 

 course of a half day's drive in Central ISTew York during last Au- 

 gust or September one might see along the roadside, perhaps, a 

 hundred or more sugar and Norway maples on which more than 

 half of the foliage was brown Many slightly affected trees would 

 also be seen. 



T Pseudomonas campestr'is (Pammel) Smith. 



