350 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
that about one-third of them, not including the lot dipped in the 
wash at 212° F., were clean, while the remaining two-thirds showed 
an infestation which varied from 2 per ct. to 35 per ct. of that 
previous to the treatment. The lot dipped in wash heated to 
212° TF. were entirely cleaned of scales but were much injured. 
The injury was especially apparent on the younger growth. 
EXPERIMENT NO. II. 
INFESTED BEN DAVIS APPLES DIPPED FOR DIFFERENT TIME PERIODS 
IN A SULPHUR WASH. 
The purpose of this experiment was to determine the effects of 
immersion for different periods of time upon the San José scale. 
Six lots of trees, each comprising 30 well-infested Ben Davis apples, 
were used. One lot was simply plunged into the wash and im- 
mediately withdrawn, while the others were immersed respectively 
for one, two, three, five and ten minutes. The temperature of the 
sulphur wash was 60° F. 
Results on scale-—— The trees were examined at regular intervals 
to determine the effects of the treatment on the San José scale. 
On July 5 a few larvae were found on a number of trees in all of 
the lots. During August there was a slight increase in the num- 
bers of the scales, but in no instance was the new infestation con- 
spicuous. As compared with the condition of the trees before 
dipping there was a marked reduction in the numbers of the scales. 
The moderately infested trees were as a rule quite clean, and larval 
activity was usually most prominent on the trees that were originally 
the most infested. Taking the trees as a whole, there was very lit- 
tle difference in the amounts of scale destroyed by dipping for the 
various time periods. In all of the lots there were some trees that 
were clean and others that showed varying degrees of infestation, 
which was sometimes as much as 35 per ct. of that at the time of 
the treatment. 
EXPERIMENT NO. III. 
INFESTED BARTLETT PEARS DIPPED IN SULPHUR WASH FOR DIFFERENT 
TIME PERIODS. 
The details of this experiment are the same as the one just pre- 
ceding, differing only in that 180 Bartletts were used in place of the 
apples. All the trees were well infested with the scale. 
Results on scale——In all of the lots there were trees which 
showed on July 5 more or less breeding of the scale. By Septem- 
ber 8 there was no apparent difference in the conditions of the trees 
