270 RepoRT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
Applied Apr. 2 and 4. Clear, wind brisk, N. W. 


Strength | Kind of Date of Effect on tresn 
of oil. tree. examination. , ie 
Per ct. 
15 | Trees have about one-quarter normal set_of 
leaves. Bark very thick and spongy. 
_June 27 | Trees have developed latent buds, branching 
profusely and appear very vigorous. 
50-60 | Peat ..+ | May 5 | Trees have but few living buds. 





Applied Mar. 18. Cloudy, no wind, temperature 35° F. 




Strength | Kind of Date of | Pact ontrers 
of oil. tree. examination. : 
Fer ct. 
100 | Apple....; Apr. 12 | Slight injury to bark around buds. 
23 | Some branches with buds all killed. 
May 29 | Tree two-thirds killed. 
Peach.....| Apr. 12 | Buds nearly all dead. 
23 | A few buds making an effort to start. 
June 20 | Tree dead. 






TABLE IV.— EFrect oF CRUDE PETROLEUM ON TREES. 
SERIES I. SPECIFIC GRAVITY 0.79 (44° BAUME OIL SCALE). 
Applied Apr. 12, 1901. Clear, wind brisk, S. W., trees 15 to 30 






g feet high. 
Strength | Kind of Date of Wiact on troaa 
of oil. | tree. examination. .; 
Per ct. 
15 Peer at: May 17 | All trees show uneven application and con- 
siderable injury. 




EFFECT OF CRUDE PETROLEUM ON SAN JOSE SCALE. 
No living scale insects were found after treatment on the few 
slightly infested trees treated April 2 and 4 with crude petre- 
leum of 0.79 and 0.83 specific gravity. 
——_—" 
