INSECTS INJURIOUS TO CORN. 309 



will try to crawl out, and, if the furrows have steep and dusty walls, 

 the chinch bugs will not succeed in getting over, but will crawl along 

 the furrows and fall into the holes, where they may be killed by turning 

 on kerosene or tar, or where they may be covered up and other holes 

 dug between. 



One will see that the chinch bugs find it almost impossible to pass 

 this dusty barrier ; that the hot sun striking them without any protection 

 will kill vast numbers of them, and that just so long as it remains hot 

 and dry this arrangement will form a complete protection for a corn 

 field. It is well, however, to have one or two men, as is needed, to at- 

 tend this barrier during each day, and, by means of a hoe, to fix the 

 places along the grooves, where the chinch bugs may find places to escape, 

 to see that the chinch bugs do not occur in too great numbers in the fur- 

 row or in the holes before they are killed, and to do the utmost not to 

 allow any of the bugs to find places through which they may reach the 

 corn field. It is not absolutely necessary to make these furrows along 

 this dusty belt, although it is advisable. 



If one does not make the furrows, or in case it should rain soon 

 after the plowed strip has been made, or before the migrating bugs have 

 been captured, one can turn coal tar in the form of a band the length of 

 this dusty barrier and a few inches in width, and, as soon as dried, put 

 tar on again, and so on, until the tar will not run down through the soil,. 

 but will remain on top, the chinch bugs will not cross this barrier or 

 band of tar. If it should rain after you have made this dusty barrier 

 and the bugs have collected in vast numbers about it, the rain will un- 

 doubtedly start the fungous disease among such a mass of bugs and 

 will practically exterminate them, or you can maintain the barrier by 

 means of the ribbon of tar. 



When the chinch bugs collect in good numbers along the dusty 

 barrier, or in the trenches, or along the coal tar barrier, or in case the 

 farmer has neglected to make this barrier, and the chinch bugs have 

 collected upon the first few rows of corn in immense numbers, then 

 he should immediately stop all other work and at once spray those chinch 

 bugs with either kerosene emulsion or five per cent kerosene and water 

 mixture. In spraying the chinch bugs that have collected in the trenches 

 or along the barrier, one would do well not to wet the dust any more 

 than possible, but spray those places where the bugs are most numerous, 

 so as not to destroy the dust as a barrier. It sometimes happens, although 

 not often, that where the bulk of the chinch bugs making this migration 

 are adults, with fully developed wings, and find themselves confronted 

 with a barrier, they will take to wing and fly over, and in such cases 



