New York AGRICULTURAL EXPERIMENT STATION. 283 
TABLE X VII—Continued 





Trees. 
— ——— ———— * = Time of 
Number Degree of infesta- Strength treat- 
treated. Kinds. tion. of gas. ment. Results. 
; Gram. 
8 Bartlett. 2extensively, 0.25 i1hour Scales appar- 
4 moderately ently affected 
and 2 slightly but many live 
infested. ones found. 
Trees unin- 
jured. 
1 Bartlett. 4 extensively 90.30 Y%hour Scales dead. 
and 3 moder- Trees unin- 
ately infested. jured. 
7 Bartlett. 2 extensively 0.30 i1hour Scales dead. 
and 5 moder- Trees unin- 
ately infested. jured. 
PEACH: 
1 Var. unknown. Slightly infested 0.18 WMhour Scales not af- 
fected. Tree 
uninjured. 
Var. unknown. Slightly infested 0.18 1hour ‘Tree dead. 
Var. unknown. Slightly infested 0.30 Y%hour Tree dead. 
Var. unknown. Slightly infested 0.80 1hour Tree dead. 
tL 
The results in these experiments were unexpected. Neither 
the .18 gram or .25 gram had any appreciable effect. The live 
scales were as numerous and active on the treated trees as on 
the checks. There was a decided difference, however, in the 
trees treated with the 3 gram. The scales were dead on all the 
trees. The peaches, although in fairly good condition, suc- 
cumbed quickly to the gas. The limited number of peach trees 
used makes a repetition of the experiment desirable. 
ORCHARD VI: PLUMS. 
This orchard consists of 22 plum trees, European varieties, 
which were set out about ten years ago. They have been well 
cared for and have been in thriving condition until recently when 
they began to show the effects of the San José scale. When the 
experiments were begun they were all extensively infested and 
hence weakened by the scale. The treatment and results in this 
orchard are shown in Table XVIII. 
