62 
EASTERN SHADE TREE CONFERENCE 
on that one factor will depend the possibility or impossibility of the act¬ 
ual eradication of the Dutch elm disease. The answer to this question 
and the results in the next year or two in preventing the further exten¬ 
sion of the infected territory will decide whether it will be practicable to 
eradicate the Dutch elm disease or whether we will have to live with it 
and depend on local suppression measures for regions where elm values 
will warrant the costs. 
At least three important assets have accrued in New York State from 
the eradication program to the present time; first, the elm values of 
metropolitan New York have been saved by reducing annual losses to 
about one-tenth of one per cent; second, eradication measures have been 
developed which can be economically applied to maintain these elm 
values in metropolitan New York at a cost of about 15 per cent of the 
total cost of removing the elms in important locations alone, if they 
were allowed to die over a ten year period; and third, the experience 
gained and possible research developments to come, furnish reasonable 
hope that protection can be given to smaller residential areas where elm 
assets warrant the cost of inspection and sanitation for bark beetle 
breeding material. 
DUTCH ELM DISEASE ERADICATION WORK 
IN NEW JERSEY 
By E. G. Rex, Supervisor , Plant Pest Control , N. J. Department 
of Agriculture, Trenton 
The first Dutch elm disease infected tree was found in New Jersey in 
the spring of 1933. During the years of 1933 to 1936 inclusive there 
was a progressive annual increase in the number of Graphium trees 
found in the State. In the year 1937 the number of Graphium trees 
located was less than the number detected during the season of 1936 and 
we, probably optimistically, assumed that we had reached the peak of 
Graphium incidence in the year 1936 and were now gloriously coasting 
to our objective of eradication. However, with an increase of 200 per 
cent of confirmed Graphium trees in 1938 as compared to 1937 we were 
promptly disillusioned of the trend, temporarily at least, of our success 
in the eradication venture. 
Having the sudden increase of 200 per cent in the incidence of Graph¬ 
ium in the State of New Jersey could readily lead to despair. However, 
such a spirit of resignation should not be adopted without a struggle. 
