14 Farmers’ Bulletin 1252. 
It will further simplify the task of a grower if he will endeavor 
to interest his neighbors who have roses to cooperate with him in 
destroying pests, for if bushes belonging to them remain infested 
they will be a constant source of reinfestation for his. 
STUDY of this bulletin should make it possible 
to identify the particular kind of sawfly attack- 
ing roses. This done, information on the number of 
generations to be expected may be had by consulting 
the life-cycle diagrams (fig. 7). If only one gener- 
ation occurs, as in the European rose slug, one or 
two sprayings should effect control; but if there is 
more than one generation, as with the coiled rose- 
worm and the bristly rose slug, the gardener will 
have to keep a closer watch upon his bushes and 
spray more often. 
Farmers’ Bulletin 750, which deals with roses and their culture, 
contains a discussion of the remedies for various insect pests. This 
bulletin is of value to all rose growers and may be obtained from 
the Division of Publications, United States Department of Agricul- 
ture, Washington, D. C. 
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