CHAPTER XIII 
PESTS AND DISEASES 
Wir the increase in sugar-beet production, it is only 
natural that there should also be an increase in the pests 
that attack the plant. The gradual introduction of the 
enemies of the crop into sections is continually making 
the sugar-beet more difficult to raise. Because the 
various troubles are likely to appear at almost any lo- 
cality, it is imperative that growers should be able to 
recognize them in order that they may be checked as 
completely as possible. Profitable sugar-beet production 
has practically ceased in certain sections because ‘the 
seriousness of the pests was not recognized and control 
measures taken in time. It is not within the scope of 
this book to give a complete discussion of all the pests 
and diseases affecting sugar-beets. Those who wish more 
detailed information should consult the special publica- 
tions dealing with the various troubles. 
INSECT PESTS 
Extent of pest injury. 
There are at least one hundred and fifty species of in- 
sects known to feed on beets; of these about forty are of 
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