CHAPTER XIII 



PESTS AND DISEASES 



With 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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