134 NEW YORK STATE MUSEUM 
4 
following trees, 18, 25, 36, 37, 38, 40, 41, 48, 47, 65, 79, 82, 83, 
84, 85, 105, 106, 108; young were rather abundant on trees 15, 16, 
21, 22, 23, 28, 44, 61, 68, 69, 114; and young were very abundant on 
tree 73. 
These trees were again carefully inspected Nov. 11 by my 
assistant, Mr Walker, who rated them as follows. Condition 
good, trees 15, 16, 17, 18, 19, 24, 25, 26, 27, 34, 35, 36, 37, 42, 43, 
44, 45, 47, 60, 61, 62, 63, 64, 65, 66, 68, 71, 79, 80, 81, 82, 83, 84, 
85, 86, 87, 88, 89, 90, 91, 101, 102, 103, 104, 105, 106, 109, 110, 111, 
112, 113, and 114. The following were classed as being in a bad 
condition, that is having on them a number of living scale 
insects, trees 21, 22, 23, 38, 40, 41, 69, 70, 108; and trees 28 and 
73 were rated as being very bad. 
It will be seen by the above that only two trees were in very 
bad shape at the end of the season, and both of these were 
badly infested when the spraying was done last spring. Many 
of those classed as being in bad condition have the bark of the 
larger limbs and trunk rough, and this interferes materially 
with the efficiency of the insecticide. A comparison of the con- 
dition of these 70 trees ‘with the 50 at the other end of the orchard 
sprayed with lime, salt and sulfur mixture is quite marked 
and emphatically in favor of treatment with the oil. It should 
be stated however that the relative inefficiency of the lime, 
salt and sulfur mixture was probably due to the rains following 
so shortly after application and continuing so long [see page 
132]. These had practically no effect on the oil and therefore 
gave it the advantage. 
The writer at the outset raised the question as to the pos- 
sibility of injury resulting to trees which had been sprayed 
with petroleum for successive seasons, and now he is in a position 
to supply a little data on this question. Trees 25-28, 41-47 and 
101-14 have received applications of crude petroleum for three 
successive seasons. Tree 101, a seckel pear, was very badly 
infested in 1900 when it was sprayed with undiluted petroleum 
and sustained serious injuries. The following year it was 
sprayed with a mechanical mixture, consisting of 15¢ oil and a 
whale oil soap solution, 1 pound to 4 gallons. Last spring it 
was sprayed with the 20% mechanical emulsion. This tree was 
in very bad condition at the outset, and, as above noted, was 
