Where the flight of insects to hibernation quarters has been 

 carefully studied, as it has been, for instance, in the case of the 

 bollweevil, an insect normally not much given to flying, it has 

 been found that specially suitable hibernation quarters, such 

 as woods, exert influence to distances of miles, hence mere 

 destruction in and about the cotton fields -will not amount to 

 very much. In the majority of cases the fields affected by the 

 grain bug are surrounded by land that is not and usually can- 

 not be farmed. Were the hibernation quarters, not covered by 

 shrubby growth, as far as possible be plowed us, this would 

 destroy the natural and usually at best rather scanty cover of 

 vegetation, consisting mostly of native drouth resisting 

 grasses. It has never soaked into the thick skulls of the En- 

 tomologist and such of his men as are willing to side with him 

 in saying I am wrong on every point, that nature abhors bare 

 ground, and covers it with such vegetation as is suitable, called 

 usually weeds. In truth these plants try to remedy the harm 

 done by man in destroying the better plants that formed the 

 original covering, and which are more slow in establishing 

 themselves than the plants called weeds. The lands affected 

 at present by the bugs in question are mostly grazing lands, 

 cultivated fields being operated either under irrigation or dry- 

 farming methods. If the range has been kept grazed too close 

 by overstocking, this also in a lesser degree than plowing and 

 burning, superinduces the establishment of less desirable 

 plants. Thus in reference to sheep weed (snakeweed, 

 Gutierrezia) you read on page 23 of U. S. D. A. Bulletin No. 

 211: Factors affecting range management in New Mexico: "In 



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