Two Plant Lice oe the Peach. 17 
ently, it gave a little better final results than anything else used. 
Table III gives a summary of results in both the Strain and Paxson 
orchards. It may be seen from this table that, with the exception 
of Nico-fume, all the tobacco sprays of both early and late applica¬ 
tions resulted in much good, but that lime and sulfur applied on the 
latest date of spraying did not prove beneficial. This application of 
lime and sulful was made at a time when some of the first lime and 
sulfur spraying was being done in the Valley, but earlier than much 
of it. The experience of most of the orchardists was: that the lime 
and sulfur did no good applied late for green peach aphis, which 
•tallies with our experience. This season’s experiments indicate that 
the most important thing in connection with the control of this 
aphis by the use of lime and sulfur, is to get it on early; just as the 
eggs were beginning to hatch was found to be a splendid time. If 
spraying is delayed until the aphis becomes full grown, some other 
spray besides the lime and sulfur should be used. This spray will 
not kill the mature stem-mothers unless applied in excessive quan¬ 
tities. 
The tobacco sprays are much better to use when mature lice 
can be found. But these preparations are also more effectual at 
the time when the eggs are hatching. A great amount of material 
is required in order to be thoro enough to kill most of the lice after 
they are fully grown. 
The average orchardist would probably have a hard time to 
detect the little lice when they are first hatched, but the importance 
of spraying at this time should be sufficient reason for him to learn 
to find them. If this is not possible it would be reasonably safe to 
say that the lice may be found hatching after the first few days of 
warm spring weather in February or March, in the vicinity of 
Grand Junction, and that a spray at such a time would be success¬ 
ful. A hand lens, costing 25 to 50 cents, is of great service in find¬ 
ing the lice. 
On March 25th some large Triumph peach trees were sprayed 
on the C. H. Dilley place at Clifton. These trees had been sprayed 
a few days previously with lime and sulfur, but apparently with no 
success in killing the aphis, which at this time were clinging to the 
partially open blossoms waiting for a chance to get within. Part 
of these trees were treated with Black Leaf, 1 gallon to 70 gallons 
of water, and the rest with Black Leaf “40,” 1 gallon to 800 gallons 
of water. By exceedingly careful and thoro spraying, entailing the 
use of at least ten gallons of spray to a tree, it was found that prac¬ 
tically all the lice could be killed. The Elberta trees in this orchard 
did not have so many of the aphids on them, and the manager of the 
place decided that they did not need to be sprayed. On May nth 
an examination of these trees showed the Elbertas to be badly in- 
