989 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THD 
The results with the plum buds were practically the same as 
with the apples. The gas at a strength of .3 gram of cyanide 
had practically no more effect than at .18 gram. There was also 
but little difference in the percentage of treated buds that set 
and the percentage of the checks that set. The total number 
of treated buds was 1505, of which 81.1 per ct. set, and the total 
number of checks 1673, of which 84.7 per ct. set, making a differ- 
ence of only 3.6 per ct. in favor of the checks. As with the other 
varieties the growth was nearly equal to the checks. 
SERIES II. EFFECT OF THE GAS UPON THE SAN JOSE SCALE. 
The experiments were conducted in four different orchards in 
the vicinity of Geneva. Some of the trees were fumigated in 
December and the remainder in June. But one treatment was 
made. The results are shown in the following tables. 
ORCHARD II: PEARS. ORCHARD IV: PEACHES. 
Weather during tests in Table X VII.—Winter treatment. Trees 
treated Dec. 13 to 24, average temperature 27°, cloudy with light 
rains or snow. Weather during the week foilowing cloudy with 
average temperature of 299. 
TABLE XVII.—IFUMIGATION TESTS ON INFESTED PEAR AND PEACH TREEs. 




Trees. 
js ies —~+, Time of 
Number Degree of infesta- Strength  treat- 
treated. Kinds, tion. of gas. ment. Results, 
Gram. 
PEAR: 
6 Bartlett. > extensively 0.18 Whour Seales not af- 
and 1 moder- fected. Trees 
ately infested. uninjured. 
7 Bartlett, 3 extensively, 0.18 lhour Scales not af 
2 moderately fected. Trees 
and 2 slightly uninjured. 
infested. 
8 Bartlett. 5 extensively, 0.25 Whour Scales appar- 
2 moderately 
and 1 slightly 
infested. 
ently affected 
but many: live 
ones found. 
Trees unin- 
jured. 
