350 ReEporT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
Summary of results——As in experiment V, the immersion of the 
roots of Ben Davis apples in the lime-sulphur wash invariably re- 
sulted in the death of a large number of the plants. Of ninety that 
were wholly dipped, 85 trees, or 94 per ct. of the number treated in 
this manner, were killed. Dipping of the tops of the trees was un- 
accompanied by important injuries. Immersion of ihe tops of the 
trees for periods of five to ten minutes seemed to cause a slight 
retardation of the buds, and in some instances to destroy a few buds 
and to injure the tips of pruned branches. All of the thirty checks 
lived, without showing appreciable injuries by transplanting. 
EXPERIMENT NO. VII. . 
BEN DAVIS APPLES DIPPED IN DIFFERENT SPRAYS. 
The sprays employed were the standard lime-sulphur wash, 
kerosene emulsion, containing 10, 15 and 20 per ct. of oil, and 
miscible oil in the proportions of one part to ten, fifteen and twenty 
parts of water. For purposes of comparison 18 trees were fumi- 
gated with hydrocyanic acid gas, using potassium cyanide at the 
rate of 0.3 gram per cubic foot. Each lot of trees intended for 
treatment by a mixture at a desired strength was divided equally, 
and half the trees were wholly immersed and half were dipped 
with the exception of the roots. The temperature of the liquids 
was 60° F. For the experiment 430 Ben Davis apples were dipped. 
In the treatment, the trees were plunged into the mixtures and in- 
stantly withdrawn. 
Results on trees —— The effects of the different treatments on the 
trees are shown in the accompanying table :— . 
TasLE I] —Errects on Ben Davis APPLE TREES OF DIPPING IN VARIOUS 



SPRAYS. 
No. 
TREATMENT. of Results on trees. 
trees 
Ulphur waste LOPSTOMLY wate ere cee cet tnt iene iene eater ree 135 [{ No injury. 
Sulphur wash; topssand: roots wis. ashi. Genie CR ek See 135 ' 133 trees killed and two 
trees with slight in- 
juries. 
Kerosene emulsion (10-20 per ct. oil), tops only......... | 30 | No injury. 
Kerosene emulsion (10-20 per ct. oil), tops and roots.... 30 | No injury. 
Miscible oil tet Perch Ol), tOpssOnly ee + ee ee 50 | No injury. 
Miscible oil (10-20 per ct. oil), tops-and roots........... 50 | No-injury. 
FBumization with hydrocy=nic acid @asi.o. sw) ack seb 18 | Trees normal. 
Checkss‘no ‘treatment’. Sete ot Oe ee ee eee 30 | Trees normal. 
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