46 Farmers’ Bulletin 1128. 
Figure 33 illustrates an apple bud with aphids clustered on it in 
about the right condition for the delayed dormant treatment. Figure 
34 shows an apple bud with leaves so far out that the aphids are 
pretty well protected between the leaves, and the delayed dormant 
application would not be very effective in killing the aphids, and 
might cause some foliage injury. 
In the case of the green apple aphis, which lives on the apple 
throughout the year, the suppression of stem-mothers in the spring 
a 
: 
jg 
Fira. 33.—Young stem-mothers of an apple aphid and condition of buds when the 
bud spraying should be given. Enlarged. : 
does not always guarantee freedom from this insect during midsum- 
mer, and supplementary treatments sometimes are desirable. In the 
case of young orchards, where the green apple aphis is principally to 
be considered, the bud spray should be given, but additional applica- 
tions should be made in summer if found necessary. 
Spraying in the fall for the destruction of the fall migrants and 
the egg-laying females has been tried to a limited extent, but the 
adequacy of the treatment has not yet been proven. 
Annual bud spraying of apple orchards would appear to be good 
practice, and over a series of years would no doubt prove profitable. 
