New York AGRICULTURAL EXPERIMENT STATION. 165 
very light (.75 inch 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 fogey 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 amount of damage done by tip burn of cauliflower has 
been small. 
LEAF SCORCH OF NORWAY AND SUGAR MAPLES. 
The Norway maple, Acer platanoides, is much subject to injury 
from excessive transpiration. In New York more or less of it occurs 
nearly every season. It is most common on recently transplanted 
trees, but very frequently occurs 6n 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 Norway maple it 
has been common on the sugar maple, Acer saccharinum. In the 
course of a half day’s drive in Central New 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. . 

7 Pseudomonas campestris (Pammel) Smith. 
