New YorK AGRICULTURAL EXPERIMENT STATION. 821 
DETAILED RESULTS. 
At the time of final examination, September 27, Apples Nos. 
17 to 19, whose treatment is noted in Table IV, showed the fol- 
lowing results from the applications: 
Apple No. 17.— One adult female dead with 44 dead young 
beneath her scale; 2 adult females alive with 16 to 23 dead 
larve respectively beneath their scales. Remainder of scales 
dead. 
Apple No. 18.— Seventy-eight dead larve on the surface of the 
deposit covering the apple; 17 adult females alive and from 15 
to 30 dead and from 5 to 10 active larvee; 5 adult females alive, 
two of which had raised their scales above the crust; 10 adult 
females dead; 4 nearly mature females on sides of apple alive; 4 
scales that had reached the black stage were also found alive. 
Apple No. 19.— Twenty-one larvae were found dead under the 
heavy deposit about the calyx; 15 adult females living with from 
2 to 7 dead and 3 to 11 living larve under their scales; 13 young 
alive that had passed the first molt. Remaining scales dead. 
CONCLUSIONS. 
The mechanical effect of a heavy deposit of precipitates upon 
the development of the scale is well brought out in this experi- 
ment. While the soluble ingredients of the wash evidently killed 
many of the scales at the time of the first and second treatments, 
the later treatments, which consisted largely of the precipitates, 
killed a higher percentage of the scales, as shown by the table. 
The fact also that many of the young scales were found held 
securely under the crust and others dead upon it, further indi- 
cate the mechanical effect of the heavy deposit. The larve that 
were found dead upon the crust were unable to find a suitable 
place to settle down. Their delicate mouth parts could not pene- 
trate the coating of precipitate. In this experiment the heavy 
deposit acted as a mechanical obstruction to the emerging and 
settling down of the young and resulted in killing a fair per- 
centage of the mature females and a majority of the immature 
scales, a much larger percentage in the case of the latter than 
in any of the previous experiments. 
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