300 Report oF THE DEPARTMENT OF ENTOMOLOGY OF THE 
individual specimens will be alive. Again, the percentage of 
living scale-insects will vary not only on the part of the tree 
upon which they occur but also with the season of the year. 
‘CONDITION BEFORE TREATMENT. 
The following table gives approximately the condition of the 
San José scale-insect on peach in March, 1901, prior to treat- 
ment. The percentages were obtained by taking the infested 
branches into the laboratory and making a microscopic examina- 
tion of all the specimens. The branches were taken from dif- 
ferent trees: 
TABLE VII.—SAN JOSE SCALE ON PEACH, MArcH, 1901. 
l-yr. wood. 2yr. wood. Average. 
Per ct. Per ct. Per ct. 
Living specimens on first branch....... 24. 52. 38. 
Living specimens on second branch.... A 62. 44.5 
Living specimens on third branch..... 4 22. 65. 43.5 
AVOVORO 15 ccncikaee caves as sores tee y 24.3 59.6 42. 
CONDITION AFTER TREATMENT. 
Under tents ——(1) In the small orchard, November 20, 1900, four 
plums showed a few living specimens of the scale-insects on new 
wood. ‘Three of the trees were badly infested before treatment; 
on the other, specimens were numerous at time of treatment. 
These trees were fumigated April 13th. As near as could be 
estimated for tents, 1? to 2 ozs. of potassium cyanide per 100 
cu. ft. were used for periods varying from 35 to 60 minutes. 
One cherry, treated April 14th with over 2 ozs. per 100 cu. ft. for 
70 minutes has living specimens on new wood. Specimens were 
numerous before treatment. 
It is a marked fact that as late as December 7, 1901, the in- 
crease of specimens on the above trees has been so slow that it 
is still a hard matter to find them. 
(2) In the large orchard, living specimens of the insects were 
found on treated trees in one instance, but as only part of the 
orchard was treated there was a chance for the insects to be 
transferred from untreated to treated trees thus making it im- 
