CONTROL OF THE CODLING MOTH IN NEW MEXICO. 7 
This table also shows the destructive influence of sprays in lessening 
the actual number of larve. Thus on Piat I, which received three 
sprays, there was a total of 818 larve for the season, on the five 
count trees; on Plat II, which received four sprays, the number of 
larvee for the five trees was 271; while on Plat III, which received 
five sprays, only 148 codling moth larve were found in fruit from the 
five ‘‘count trees’ during the year. The foregoing figures are in 
marked contrast with the total number of larve found in fruit from 
the five unspraved trees, namely, 23,570. 
RECOMMENDATIONS BASED ON THE FOREGOING RESULTS. 
While the results reported herewith are very clear-cut, the bureau 
would not be warranted in formulating definite recommendations 
based upon the work thus far carried out in the Pecos Valley were it 
not for the reason that these results substantiate the results obtained 
from a large series of spraying experiments against the codling moth 
in many parts of the United States. In Table I, showing treatments 
and dates of applications, the reader will note that the first applica- 
tions were made with Bordeaux nozzles and the later applications 
with eddy chamber nozzles. Entomologists of certain Western States 
who have experimented with the codling moth under arid conditions 
insist upon the advantage of a coarse spray given at the time imme- 
diately following the dropping of the petals. Tests of the compara- 
tive value of coarse and fine sprays under eastern conditions show 
that there is apparently but little difference as regards the effective- 
ness in the control of the insect of a coarse and fine spray. The 
Roswell experiments did not include a comparison of coarse and fine 
sprays and no specific information can be furnished on this point, 
and it would appear safer for the orchardist to follow the methods 
used by Mr. Hammar until further information is obtained. It will 
also be noted that spraying was done under high pump pressure. 
This should not be construed to mean that effective work in the con- 
trol of the codling moth can not be accomplished except by use of 
power outfits working at high pressure. Very good results have been 
obtained from the use of barrel sprayers working at perhaps 100 to 
120 pounds pressure. 
The prime essential in the control of the codling moth is that the 
treatment given immediately after the falling of the blossoms shall 
be made with great thoroughness, in order to insure the lodgment of 
poison in the calyx cup of each and every apple. This result is best 
secured by so handling the spray rods that the spray is directed 
downward into the upright clusters of the little apples. This spray- 
ing especially should be made rather deliberately and with great 
pains. Frequent examination of sprayed trees should be made to 
determine how thoroughly calyx cups are being filled with poison. 
