288 
SprRAY PRrRoGRAM FOR THE CODLING-MOTH 
Spray programs heretofore outlined have been based on fixed dates 
or on time of the fall of the petals. It is better to follow programs of 
these kinds than to spray hit and miss, but these programs do not take 
into consideration seasonal variations and variations due to local pecul- 
iarities, to altitude, to latitude, or to other circumstances which might 
have an effect upon temperature. 
The following program is based upon the relation of accumulated 
effective day-degrees to the time of the appearance of the different 
broods of larve. It provides for seven sprays, three for the first brood, 
two for the second, and two for the third. The table shows the accumu- 
lation of effective day-degrees at which the fruit-grower should begin to 
spray in order that he may complete the work in from one to ten days. 
This spray program (Table 51), like all others which have been proposed, 
must be tested thoroughly and proved reliable before it can be accepted 
as satisfactory. 
Too much emphasis can not be placed upon the necessity of applying 
two sprays for the second brood of larve, and of making the first spray 
for the second brood very thorough. The second brood is much more 
numerous than the first and comes:at a time when the fruit is increasing 
in size very rapidly; hence, one spray applied at the time when the first 
larve of the second brood enter the fruit will not suffice to check those 
that enter three or four weeks later. The second and third broods of 
larve overlap, consequently after the second brood begins to enter the 
fruit larve are entering it continuously in large numbers till all the third- 
brood larvee have entered, hence the fruit should be well protected during 
this period. 
The first larvee of the second generation which enter the fruit dur- 
ing July transform and produce the third generation; hence the import- 
ance of making the first spray for the second brood (the fourth spray on 
the program) very thorough so as to destroy as many of the first larve 
of this brood as possible. To reduce the third brood still further the 
spraying should be supplemented by the destruction of larve under 
bands up to the first of September. Larve that leave the fruit after 
that date will not transform until the following spring, and may be de- 
stroyed any time after the season closes. 
The seventh spray, or the second spray for the third brood, will not 
be necessary in case the sixth spray comes late in August. If it should 
come prior to the 15th of August the seventh spray will be advisable 
unless the latter part of August should be much cooler than normal. 
