40 



FARMERS BULLETIN 804. 



Annual bud spraying of apple orchards would appear to be good 

 practice, and over a series of years would no doubt prove profitable. 

 This is especially true of varieties subject to " fruit spots "' or 

 "' stigmonose," since these troubles have been shown by the Bureaus of 

 Plant Industry and Entomology to be due, in part at least, to the 

 activities of aphids. 



Fig. 29. — Young stem-mothers of an apple aiihi.l and . ,. 

 when the bud spraying should be given. Eularyid. 



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.nul.j 



CONTROL OF APHIDS ON PLUM, PEACH, CHERRY, ETC. 



The several aphids which occur on plum, as well as the gi'een 

 peach aphis, pass the winter on the trees in the egg stage, hatching 

 in the spring about the time when foliage appears. None of these 

 species curls the foliage to the same extent as do some of the apple 

 aphids, and thorough spraying of the trees when the insects are in 

 evidence usually will be satisfactory. Nevertheless spring spraying 

 against the stem-mothers is desirable in orchards where the insects 

 have been troublesome regularly or where winter eggs are seen to be 

 present in numbers. 



The black peach -aphis, which winters on the roots of the peach, 

 should be treated as soon as the insects are observed to be present 



