48 THE WHITE-FUNGUS DISEASE IN KANSAS. 
The dust barrier—The plan of the fight will necessarily depend 
on the conditions of the weather. If it should be warm and dry at 
harvest time the farmer should erect a dust barrier around the entire 
field containing the bugs, as follows: Before any of the wheat or 
other grain is cut, or, better, immediately after the first few rounds 
have been made by the binder, plow a strip around the field about 8 
feet wide. This should be harrowed or dragged to pulverize the soil ; 
then in the side of the strip farthest from the inclosed field a deep 
furrow should be thrown out with a lister, making round corners, 
and a log about a foot in diameter and 6 feet long, to which a single 
horse is hitched, should be dragged around the field during the day 
as long as migration continues. If it is very hot and dry many of 
the bugs will perish in their efforts to cross the dust barrier lying 
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Fic. 3.—Diagram illustrating the construction of the dust barrier. a, Outer edge of dust 
barrier; b, furrow; c, inner edge of dust barrier. (Original.) 
between the field and the furrow, and those which succeed in getting 
into the furrow will not be able to crawl up the dusty sides to get out. 
Many of them will be killed by the heat, and those that escape will be 
crushed by the log or smothered by the dust of the furrow. The 
log should pass along frequently enough to keep the bugs from mak- 
ing breaches in the dusty sides of the furrow by their constant en- 
deavors to climb up. If one log does not prove sufficient two or three 
may be used, as needed. 
If the weather should remain warm and dry during the whole time 
when the bugs are leaving the field the above method will be sufficient 
in most cases. This method, with perhaps a little difference in the 
details, has been found to be very effective, and has the advantage of 
being inexpensive and devoid of details which are necessary in other 
barriers, and it is, therefore, recommended when the weather is dry 
and hot. 
