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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
withstanding the fact that three or four broods may occur annually. 
The first period is covered by the first brood and the second period by 
the second and following broods, which overlap so heavily that they 
are to all intents one brood. In this respect the problem in the Ozarks 
resembles that of northern fruit sections since the two dates of par¬ 
ticular importance in the seasonal history of the insect are: the time 
of beginning of hatching of first brood larvae in economic numbers, 
and the time of beginning of hatching of the second brood larvae. The 
problem differs materially in that instead of one or two second brood 
applications, three or four applications are necessary for the second and 
following broods. 
All spray applications, with the exception of the calyx spray, are 
based upon these two dates. As may be expected a spray applica¬ 
tion is made at the beginning of the first brood and of the second brood. 
An additional first brood spray is applied at a fixed interval (usually 
two weeks) following the first application to give continuous protec¬ 
tion. Additional applications for the second and following broods are 
spaced at intervals following the first second brood application to give 
protection until near harvest. This interval is usually three weeks 
and is based on the growth of the fruit and amount of precipitation. 
The time of beginning of hatching of the third and fourth broods is 
not of consequence in planning a spray schedule as there is no interval 
between broods when it is safe to leave the fruit unprotected. 
It is more difficult to determine the time for making the earliest 
first brood application than the first second brood application. 
As noted above there are anywhere from three to six weeks after the 
falling of the petals before larvae of the first brood begin hatching in 
appreciable numbers. With such a variation it is not possible to rec¬ 
ommend for any season in advance that the first spray following the 
calyx application should be made at a stated time, say three or four 
weeks later as seems to be practical in many other regions. The time 
for this application must be determined by life history studies each 
season. To make the matter more difficult the time of emergence of 
the earliest moths is not a reliable index for the time of the beginning 
of hatching of larvae in economic numbers, as the interval between 
these events of seasonal history varies to too great an extent. The 
interval was 18 days in 1918 and 38 days in 1919. 
The time between the emergence of the earliest first brood moths 
and the hatching of the earliest second brood larvae was 10 days in 
1908 and 1918 and 8 days in 1919. Hatching in considerable numbers 
began soon after. It is reasonable that the timing of the first second 
brood spray may safely be based on the beginning of emergence of 
first brood moths. 
